JP2007028539A - Optical transceiver module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more simply realize duplexing of a single-core bidirectional optical transmission system.
The optical transceiver module 1 includes light emitting elements 8a and 8b and light receiving elements 9a and 9b, and makes output optical signals LOa and LOb incident on optical fibers 4a and 4b, as well as from the light receiving elements 9a and 9b. Optical transmission / reception subassemblies 3a, 3b that convert current into output electrical signals, a drive circuit 6 connected between the external input terminal 13 and the inputs of the optical transmission / reception subassemblies 3a, 3b, and optical transmission / reception subassemblies 3a, 3b A switch SW1 having input terminals 16 and 17 connected to the output side of the output terminal 18 and an output terminal 18 connected to the external output terminal 14 side, and a controller 7 for sending a control signal for controlling switching of the switch SW1. Preamplifiers 5a and 5b connected between the outputs of the optical transmission / reception subassemblies 3a and 3b and the external output terminal 14 are provided.
[Selection] Figure 1

Description

  The present invention relates to an optical transceiver module used in optical communication.

In general, as an optical transceiver used for optical communication, an SFP (Small Form Factor Pluggable) type optical transceiver described in Non-Patent Document 1 described below is widely commercialized. In such an optical transceiver, an optical transmission subassembly (TOSA: Transmitter Optical Sub-Assembly) and an optical reception subassembly (ROSA: Receiver Optical Sub-Assembly) are generally used as photoelectric conversion elements. On the other hand, as a photoelectric conversion element, as described in Patent Document 1 below, an optical transmission / reception subassembly (BOSA: Bi-Directional Optical Sub-Assembly) in which TOSA and ROSA having different wavelengths of light to be transmitted and received are integrated. Also comes to be used. Therefore, in the single-core bidirectional optical transceiver described in Patent Document 2 below, a photoelectric conversion element corresponding to the BOSA is used, and an optical transceiver having the same size as that of a conventional SFP optical transceiver is realized.
"INF-8074iSpecification for SFP (Small Formfactor Pluggable) Transceiver Rev 1.0", [online], May 12, 2001, SFF Committee, [Search June 15, 2005], Internet <URL: ftp: // ftp .seagate.com / sff / INF-8074.PDF> JP 2003-329892 A Utility Model Registration No. 3106698

  In the conventional SFP type optical transceiver described above, TOSA and ROSA are used for the photoelectric conversion elements, so two optical fibers are required for each transceiver. On the other hand, the single-core bidirectional optical transceiver described in Patent Document 2 enables bidirectional signal transmission using only a single-core optical fiber by using BOSA, and has recently been used in PON (Passive Optical Network) applications. It has come to be used.

  However, when a single-core optical fiber is used, in order to multiplex and divide optical signals having different wavelengths for transmission and reception, it is necessary to prepare two types of optical transceivers on the transmission side and the reception side. . Specifically, when a type of BOSA that multiplexes and divides an optical transmission system having a wavelength λ1 and an optical reception system having a wavelength λ2 is mounted in one optical transceiver, the other pair of optical transceivers has a wavelength λ1. And an optical transmission system with a wavelength λ2 and a type of optical transceiver are mounted, and two types of optical transceivers are required. In addition, when an optical transmission system using the pair of single-core bidirectional optical transceivers is duplexed, another pair of optical transceivers is required.

  Therefore, an object of the present invention is to provide an optical transmission / reception module that can more easily realize duplexing of a single-core bidirectional optical transmission system.

  In order to solve the above problems, an optical transceiver module of the present invention includes a light emitting element that receives an input electric signal and converts the input electric signal into a first output optical signal, and a first input optical signal from the first optical fiber. And a light receiving element that converts the first input optical signal into a current, makes the first output optical signal incident on the first optical fiber, and converts the current into the first output electrical signal. An optical transceiver subassembly, a light emitting element that receives an input electrical signal and converts the input electrical signal into a second output optical signal, and a second input light that receives the second input optical signal from the second optical fiber. A second optical transmission / reception subassembly for converting a current into a second output electrical signal, and a second output optical signal incident on the second optical fiber, and a light receiving element that converts the signal into a current. Input terminal and first and second optical transmission / reception A drive circuit unit that is connected to the input of the bus assembly and outputs an input electrical signal to the first and second optical transmission / reception subassemblies based on a drive signal from the external input terminal; A connection between the first and second input terminals and the output terminal, the first and second input terminals respectively connected to the output of the transmission / reception subassembly and the output terminal connected to the external output terminal A first switch section for switching between the first switch section, a controller for sending a control signal for controlling the switching of the first switch section, and the first and second optical transceiver subassemblies between the output and the external output terminal. And an amplifier circuit unit that is connected in series with the switch unit and amplifies the output electric signal.

  In such an optical transceiver module, an input electrical signal is generated based on a drive signal from an external input and input to the first and second optical transceiver subassemblies, and the first and second optical transceivers are output as optical signals. The light is incident on an optical fiber connected to the subassembly. On the other hand, an input optical signal received from an optical fiber connected to the first and second optical transmission / reception subassemblies is converted into an output electrical signal by the first and second optical transmission / reception subassemblies, and then the amplification circuit And is selectively output to the outside via the first switch unit under the control of the controller. As a result, one module can be simultaneously connected to two optical transmission systems having different patterns of the output light wavelength and the input light wavelength, thereby simplifying the duplexing of the single-core bidirectional optical transmission system. Can be realized.

  And an input terminal connected to the external input terminal, and first and second output terminals connected to inputs of the first and second optical transmission / reception subassemblies, respectively. It is preferable that a second switch unit that switches the connection between the two output terminals is further provided, and the controller also sends out a control signal that controls switching of the second switch unit. With such a configuration, an input electrical signal generated based on the drive signal input from the external input terminal can be input to one of the first and second optical transmission / reception subassemblies, so that the entire module Power consumption can be reduced.

  The monitor further includes a monitor unit that generates a monitor signal indicating a monitoring result of the first and second input optical signals or the first and second output optical signals, and the controller switches the switch unit according to the monitor signal. It is also preferable to control. In this case, the optical transmission system to be used can be efficiently switched according to the quality of the optical signal of the duplexed optical transmission system.

  A first input terminal connected to the first output terminal of the second switch section; a second input terminal; and an output terminal connected to an input of the first optical transceiver subassembly. , A third switch section for switching the connection between the first and second input terminals and the output terminal, a first input terminal connected to the second output terminal of the second switch section, and a second input A fourth switch section having a terminal and an output terminal connected to the input of the second optical transmission / reception subassembly, and for switching the connection between the first and second input terminals and the output terminal; A first output terminal connected to the first input terminal of the first switch; a second output terminal connected to the second input terminal of the fourth switch; and an output of the first optical transceiver subassembly. A first input terminal and a second output terminal connected to the input terminal. A fifth switch unit for switching, a first output terminal connected to the second input terminal of the first switch unit, and a second output terminal connected to the second input terminal of the third switch unit And a sixth switch section that has an input terminal connected to the output of the second optical transmission / reception subassembly and that switches the connection between the first and second output terminals and the input terminal, The unit has a first drive circuit connected to the input or output of the third switch unit, and a second drive circuit connected to the input or output of the fourth switch unit, and the amplifier circuit unit is The first amplifier circuit connected to the input or output of the fifth switch unit and the second amplifier circuit connected to the input or output of the sixth switch unit, Sending out a control signal for controlling the switching of the switch unit 6 Preferred.

  In this way, after the input optical signal received from the optical transmission system is converted into the output electrical signal in the first optical transmission / reception subassembly, the output electrical signal is input to the input electrical signal via the fifth and fourth switch sections. The signal is input to the second optical transmission / reception subassembly. Similarly, when an input optical signal is received by the second optical transmission / reception subassembly, the input electrical signal is input to the first optical transmission / reception subassembly via the sixth and third switch sections. Accordingly, a repeater that relays between an optical signal transmitted / received in the optical fiber connected to the first optical transmission / reception subassembly and an optical signal transmitted / received in the optical fiber connected to the second optical transmission / reception subassembly. Can be realized at the same time.

  The third and fourth switch sections each have a third input terminal, and the fifth and sixth switch sections are respectively connected to the third input terminals of the third and fourth switch sections. Output electrical signals input to the fifth and sixth switch sections under the control of the controller, and input electrical signals via the third and fourth switch sections, respectively. Are preferably input to the first and second optical transceiver subassemblies. In this case, after the input optical signal received from the optical transmission system in the first optical transmission / reception subassembly is converted into an output electrical signal, the output electrical signal is input to the input electrical signal via the fifth and third switch sections. To the first optical transceiver subassembly. Similarly, when an input optical signal is received by the second optical transmission / reception subassembly, the input electrical signal is returned to the second optical transmission / reception subassembly via the sixth and fourth switch sections. Therefore, since the optical signal transmitted from the other side of the optical transmission system is returned to the other side, it is possible to prevent the loss of the optical signal at the time of failure or the like.

  A first input terminal connected to the first output terminal of the second switch section; a second input terminal; and an output terminal connected to an input of the first optical transceiver subassembly. , A third switch section for switching the connection between the first and second input terminals and the output terminal, a first input terminal connected to the second output terminal of the second switch section, and a second input A fourth switch unit having a terminal and an output terminal connected to the input of the second optical transmission / reception subassembly, for switching the connection between the first and second input terminals and the output terminal; A fifth input terminal having an input terminal branched and connected to the wiring between the output of the transmission / reception subassembly and the first switch part, and an output terminal connected to the second input terminal of the fourth switch part Switch unit, output of second optical transmission / reception subassembly and first switch And a sixth switch unit having an input terminal branched and connected to the wiring between the first switch unit and an output terminal connected to the second input terminal of the third switch unit. , A first drive circuit connected to the input or output of the third switch unit, and a second drive circuit connected to the input or output of the fourth switch unit. A first amplifier circuit connected to the input or output of the fifth switch unit, and a second amplifier circuit connected to the input or output of the sixth switch unit. It is also preferable to send a control signal for controlling switching of the switch unit.

  With this configuration, one of the output electrical signals output from the first and second optical transmission / reception subassemblies is output to the external output terminal via the first switch unit, so that the function as a repeater is achieved. The received signal from the optical transmission system can be monitored while realizing the above.

  The second switch unit further includes a third output terminal, and the third output terminal is a wiring between the output of the first optical transmission / reception subassembly and the first switch unit, and the second light. It is also preferable to branch and connect to either one of the wires between the output of the transmission / reception subassembly and the first switch unit. In this way, the received signals from the optical transmission system in the first and second optical transmission / reception subassemblies can be efficiently monitored simultaneously.

  Further, the controller stores a switching pattern indicating a plurality of patterns of connection between the input terminal side and the output terminal side of the switch unit in the memory, and generates a control signal for controlling switching of the switch unit based on the switching pattern. It is also preferable. By adopting such a configuration, it is possible to reliably switch each switch unit corresponding to a mode such as a duplex configuration.

  According to the optical transceiver module of the present invention, duplexing of a single-core bidirectional optical transmission system can be realized more easily.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an optical transceiver module according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

[First Embodiment]
In FIG. 1, (a) is a figure which shows the structure of the optical transmission / reception module 1 which is 1st Embodiment of this invention, (b) is a duplex optical transmission system containing the optical transmission / reception module 1 of (a). It is a figure which shows a connection relationship. An optical transceiver module 1 shown in FIG. 1 is a device for converting a high-frequency driving signal input from the outside into an optical signal and emitting it to an optical fiber, and converting an optical signal incident from the optical fiber into an electrical signal. is there.

  Referring to FIG. 1A, an optical transceiver module 1 includes a pair of optical transceiver subassemblies 3a and 3b in which optical fibers 4a and 4b are connected so as to be hot-plugged, and the optical transceiver subassemblies 3a and 3b. Preamplifiers (amplification circuit units) 5a and 5b connected to the output side of the electrical signals, and switches (first switch units) SW1 connected to the output sides of the preamplifiers 5a and 5b, and optical transmission / reception A drive circuit (drive circuit unit) 6 connected to the electric signal input side of the subassemblies 3a and 3b and a controller 7 for controlling the switch SW1 are provided.

  The optical transmission / reception subassemblies 3a and 3b are single-core bidirectional optical transceivers configured so that the optical fibers 4a and 4b can be hot-plugged. Specifically, the optical transmission / reception subassembly 3a causes the output optical signal LOa having the wavelength λ1 to enter the optical fiber 4a side, and receives the input optical signal LIa having the wavelength λ2 incident from the optical fiber 4a side. The optical transmission / reception subassembly 3b causes the output optical signal LOb having the wavelength λ2 to be incident on the optical fiber 4b side and receives the input optical signal LIb having the wavelength λ1 incident from the optical fiber 4b side.

  The input terminals 10a and 10b of the optical transmission / reception subassemblies 3a and 3b are simultaneously connected to the drive circuit 6 via the branch point 12, and the output terminals 11a and 11b are respectively connected to the preamplifiers 5a and 5b. Connected to the input. Here, the light transmitting / receiving subassemblies 3a and 3b include light emitting elements 8a and 8b and light receiving elements 9a and 9b. The light emitting elements 8a and 8b output the input electrical signal output from the drive circuit 6 to the output optical signal LOa. , LOb, and the light receiving elements 9a, 9b convert the input optical signals LIa, LIb of the optical transmission / reception subassemblies 3a, 3b into currents according to the intensity of the optical signals. The currents converted by the light emitting elements 8a and 8b are respectively converted into output electric signals by a current-voltage conversion circuit (not shown) and then sent to the preamplifiers 5a and 5b.

  The drive circuit 6 is an electrical signal that is connected to the external input terminal 13 and drives the light emitting elements 8a and 8b based on a drive signal SI that is a pair of differential signals input from the external input terminal 13. An input electrical signal is generated and output to the branch point 12 side.

  The preamplifiers 5a and 5b amplify the respective output electric signals output from the optical transmission / reception subassemblies 3a and 3b, and then output them to the external output terminal 14 side as output electric signals SO which are differential signals.

  The switch SW1 provided between the preamplifiers 5a and 5b and the external output terminal 14 includes two input terminals 16 and 17 and an output terminal 18, and these input terminals 16 and 17 and the output terminal 18 Has a function of switching so that the connection between them is connected one to one. The input terminals 16 and 17 are connected to the outputs of the preamplifiers 5a and 5b, respectively, and the output terminal 18 is connected to the external output terminal 14. Such switching of the switch SW1 is controlled by a control signal SC1 sent from the controller 7.

  Here, in the optical transmission / reception module 1, it is possible to monitor the quality of signals to be transmitted / received. The optical transmission / reception subassemblies 3a and 3b, the drive circuit 6, and the preamplifiers 5a and 5b function as monitoring means for performing the monitoring. Specifically, the optical transmission / reception subassemblies 3a and 3b monitor the intensity of the output optical signals LOa and LOb using a monitor light receiving element (not shown), and output the resulting monitor signal TxP to the drive circuit 6. To do. Further, the drive circuit (monitor unit) 6 detects the intensity of the bias signal applied to the light emitting elements 8a and 8b, and uses the monitor signal TxB generated as a result as the monitor result of the output optical signals LOa and LOb. It is sent to the controller 7 together with TxP. The preamplifiers (monitor units) 5a and 5b monitor the output electric signals output from the optical transmission / reception subassemblies 3a and 3b, and then determine the average level and amplitude of the output electric signals as input optical signals LIa, It is included in the monitor signal RxP indicating the monitoring result of LIb and sent to the controller 7. Further, the preamplifiers 5a and 5b detect a clock slip in a synchronous reproduction circuit (not shown), and generate and send an alarm signal LOS as a monitoring result of the input optical signals LIa and LIb to the controller 7.

  Next, referring to FIG. 1B, a pair of optical transmission / reception modules 1 configured as described above are prepared, and two systems of optical fibers of a main system and a backup system are provided between these optical transmission / reception modules 1. By connecting 20m and 20b, a duplexed optical transmission system can be constructed. In this case, when the switch SW1 is controlled by the controller 7, the input optical signals from the main optical fiber 20m and the backup optical fiber 20b are selectively extracted as the output electrical signal SO.

  Hereinafter, the configuration and operation of the controller 7 described above will be described in more detail.

  The controller 7 is a so-called one-chip microcomputer having a CPU, and is configured to be able to perform data communication with a host controller 21 provided outside the optical transmission / reception module 1 (FIG. 1A). Specifically, as shown in FIGS. 1A and 2, the A / D converter 22 of the controller 7 receives various signals TxP, TxB, RxP, and LOS from the drive circuit 6 and the preamplifiers 5a and 5b. Upon receiving, these signals are converted from analog to digital and output to the CPU 26. In addition, the CPU 26 transmits and receives various signals such as a monitor signal and an alarm signal to and from the host controller 21 using serial communication or the like via the communication I / F unit 23. Further, the CPU 26 sends a control signal SC1 to the switch SW1 via the external output pin 24, and sends a control signal TxD for stopping the driving of the light emitting element to the drive circuit 6. Further, when the CPU 26 receives the control signal SC1 or the control signal TxD from the host controller 21 via the external input pin 25, the CPU 26 relays these control signals to the switch SW1 or the drive circuit 6.

  Here, the data storage unit 27 of the controller 7 includes a ROM 27a, a RAM 27b, and an EEPROM 27c, and the switch switching information 28 is stored in the EEPROM 27c. The switch switching information 28 includes switching patterns indicating two patterns of connection between the input terminals 16 and 17 and the output terminal 18 of the switch SW1. The CPU 26 reads the switch switching information according to the monitor signals TxP, TxB, RxP, and the alarm signal LOS, thereby generating a control signal SC1 for switching the switch SW1. At this time, after determining whether the intensity or amplitude of the monitor value is abnormal or a clock slip has occurred in the synchronous reproduction circuit, the CPU 26 reads the switch switching information according to the determination result. For example, when detecting a monitor signal corresponding to the input optical signal LIa or the output optical signal LOa, the CPU 26 reads a switching pattern corresponding to the connection between the input terminal 17 and the output terminal 18 from the switch switching information. Conversely, when the CPU 26 detects a monitor signal corresponding to the input optical signal LIb or the output optical signal LOb, the CPU 26 reads a switching pattern corresponding to the connection between the input terminal 16 and the output terminal 18 from the switch switching information. Further, in the EEPROM 27c, information about which switching pattern corresponds to the main system can be stored in the switch switching information. Thereby, even when the optical transceiver module 1 is reset, the switching state of the switch SW1 can be easily recovered.

  When the main system and the backup system belong to the same transmission cable and line path, the controller 7 may operate to switch to the larger optical transmission system by comparing the intensity of the optical input signals of both. Good. Furthermore, the optical transmission / reception subassemblies 3a and 3b to be used may be switched according to the intensity of the optical output signals of the light emitting elements 8a and 8b. In this case, the transmission error rate can be reduced even when both optical transmission systems are normal, and communication can be maintained when one of the transmission systems is abnormal.

  The controller 7 can also control the switching of the switch SW1 triggered by receiving an external command or triggered by a command received from the upper host controller 21 via serial communication or the like. Further, the controller 7 transfers the received monitor signals TxP, TxB, RxP and the alarm signal LOS to the upper host controller 21, and the upper host controller 21 responds to the monitor signals TxP, TxB, RxP and the alarm signal LOS. The switch SW1 may be switched remotely.

  The controller 7 may be a processor such as a DSP (Digital Signal Processor) or an FPGA (Field Programmable Gate Array).

  Hereinafter, the operational effects of the optical transceiver module 1 according to the present embodiment will be described in comparison with a conventional optical transceiver module.

  10A is a diagram illustrating a configuration of a conventional SFP optical transceiver 901, and FIG. 10B is a diagram illustrating a connection relationship of an optical transmission system including the optical transceiver 901 of FIG. 10A. As shown in these drawings, in the conventional SFP optical transceiver 901, an input electrical signal is output from the drive circuit 906 to the TOSA 903a based on the drive signal SI input from the outside, and the input electrical signal is output by the TOSA 903a. It is converted into an output optical signal of wavelength λ and emitted to the optical fiber 904a. On the other hand, an input optical signal having a wavelength λ incident from the optical fiber 904b is converted into an output electric signal in the ROSA 903b, then sent to the preamplifier 905, amplified by the preamplifier 905, and output to the outside. When such an optical transceiver 901 is paired to form an optical transmission system, two optical fibers are required for each of the transmission system and the reception system as a result of unidirectional communication with a single core ( FIG. 10B) makes it difficult to use the optical transmission system efficiently.

  11A is a diagram illustrating a configuration of an optical transceiver 911 equipped with a conventional BOSA, and FIG. 11B is a diagram illustrating a connection relationship of an optical transmission system including the optical transceiver 911 illustrated in FIG. is there. In the single-core bidirectional optical transceiver 911 shown in the figure, an input electrical signal is output from the drive circuit 916 to the BOSA 913 based on the drive signal SI input from the outside, and the input electrical signal is converted to a wavelength λ1 by the BOSA 913. Is output to the optical fiber 914. At the same time, the input optical signal having the wavelength λ 2 incident from the optical fiber 914 is converted into an output electric signal by the BOSA 913, sent to the preamplifier 915, amplified by the preamplifier 915, and output to the outside. When such an optical transceiver 911 is used to form a single-core bidirectional optical transmission system, the optical transceivers that are paired with the optical transceiver 911 are different types in which the wavelengths of the input optical signal and the output optical signal are reversed. It is necessary to prepare an optical transceiver 921 (FIG. 11B). In addition, in order to realize duplexing of the optical transmission system, a switch for switching between two optical transceivers and the optical transmission system is further required.

  On the other hand, according to the optical transmission / reception module 1 of the present embodiment, an input electrical signal is generated based on the drive signal SI from the external input and is input to the optical transmission / reception subassemblies 3a and 3b. The light enters the fibers 4a and 4b. In contrast, the input optical signals LIa and LIb received from the optical fibers 4a and 4b are converted into output electric signals by the optical transmission / reception subassemblies 3a and 3b, and then amplified by the preamplifiers 5a and 5b. Under the control of the controller 7, it is selectively outputted externally via the switch SW1. As a result, one module can be simultaneously connected to two optical transmission systems having different patterns of the output light wavelength and the input light wavelength, thereby simplifying the duplexing of the single-core bidirectional optical transmission system. Can be realized.

  In addition, by monitoring the signal quality of the input optical signals LIa and LIb and the output optical signals LOa and LOb, and controlling the switching of the switch SW1 according to the monitoring result, the optical signal of the duplexed optical transmission system The optical transmission system to be used can be switched efficiently according to the quality.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 3 is a diagram showing the configuration of the optical transceiver module 31 according to the second embodiment of the present invention. The optical transceiver module 31 according to this embodiment is different from that of the first embodiment in that it further includes a switch SW2 for switching the connection between the drive circuit 6 and the optical transceiver subassemblies 3a and 3b.

  That is, the switch SW2 has two output terminals 33 and 34 and an input terminal 32, and has a function of switching so that the connection between the input terminal 32 and the output terminals 33 and 34 is connected on a one-to-one basis. Have. The input terminal 32 is connected to the output of the drive circuit 6, and the output terminals 33 and 34 are connected to the input terminals 10a and 10b of the optical transmission / reception subassemblies 3a and 3b, respectively. Such switching of the switch SW2 is controlled by a control signal SC2 sent from the controller 7 in accordance with various signals TxP, TxB, RxP, and LOS.

  According to the optical transmission / reception module 31 described above, an input electrical signal generated based on the drive signal SI input from the external input terminal 13 can be input to either one of the optical transmission / reception subassemblies 3a and 3b. The power consumption of the entire module can be reduced.

[Third Embodiment]
Next, a third embodiment of the present invention will be described. 4A is a diagram illustrating a configuration of an optical transceiver module 41 according to the third embodiment of the present invention, and FIG. 4B is a diagram illustrating a connection relationship of an optical transmission system including the optical transceiver module 41 of FIG. FIG. The optical transmission / reception module 41 according to the present embodiment is different from that of the second embodiment in that the number of drive circuits and preamplifiers and connection positions are different, and switches SW3 to SW6 are further provided.

  As shown in FIG. 4A, the optical transceiver module 41 includes a pair of drive circuits (drive circuit units) 46a and 46b and preamplifiers (amplifier circuit units) 45a and 45b. 45a and 45b are respectively connected between the output terminals 11a and 11b of the optical transmission / reception subassemblies 3a and 3b and the input terminals 52 and 55 of the switches SW5 and SW6. The drive circuits 46a and 46b are respectively connected to the switches. The output terminals 48 and 51 of SW3 and SW4 are connected between the input terminals 10a and 10b of the optical transmission / reception subassemblies 3a and 3b. Here, each of the switches SW3 to SW6 is a circuit for switching the connection between the three terminals similarly to the switches SW1 and SW2.

  In the switch SW2, the input terminal 32 is connected to the external input terminal 13 to which the drive signal SI is input, the output terminal 33 is connected to the input terminal 46 of the switch SW3, and the output terminal 34 is connected to the input terminal 49 of the switch SW4. ing. On the other hand, in the switch SW1, the output terminal 18 is connected to the external output terminal 14 that outputs the output electric signal SO, the input terminal 16 is connected to the output terminal 53 of the switch SW5, and the input terminal 17 is connected to the output terminal 56 of the switch SW6. It is connected. Further, the input terminal 47 of the switch SW3 and the output terminal 57 of the switch SW6 are connected to each other, and the output terminal 54 of the switch SW5 and the input terminal 50 of the switch SW4 are connected to each other.

  The controller 7 holds a switching pattern indicating a plurality of patterns of combinations of connections between the input terminal side and the connection terminal side of the switches SW1 to SW6 in the EEPROM 27c as switch switching information. Therefore, the controller 7 reads out one switching pattern from the switch switching information, thereby generating control signals SC1 to SC6 for switching the switches SW1 to SW6 and outputting them to the switches SW1 to SW6.

  Here, when the optical transceiver module 41 adopts a switch switching pattern as shown in FIG. 4A, the optical transceiver module 41 functions as a repeater that relays the optical transmission system. When the switch switching patterns as shown in FIGS. 5 and 6 are employed, the optical transceiver module 41 functions as an optical transceiver that transmits and receives optical signals through the optical fibers 4a and 4b, respectively. Therefore, in the case of constructing an optical transmission system using the optical transceiver module 41, by connecting the optical transceiver module 41 having a repeater function between a pair of optical transceiver modules 41, optical transmission is performed with one type of module. Extending the distance of the system is easily realized.

  According to the optical transceiver module 41 described above, after the input optical signal LIa received from the optical transmission system is converted into an output electrical signal in the optical transceiver subassembly 3a, the output electrical signal is amplified by the preamplifier 45a. At the same time, it is input to the optical transmission / reception subassembly 3b as an input electric signal through the switch SW5 and the switch SW4. Similarly, when an input optical signal is received by the optical transmission / reception subassembly 3b, an input electrical signal is input to the optical transmission / reception subassembly 3a via the switch SW6 and the switch SW3. Thus, between the optical signals LOa and LIa transmitted and received in the optical fiber 4a connected to the optical transmission / reception subassembly 3a and the optical signals LOb and LIb transmitted and received in the optical fiber 4b connected to the optical transmission / reception subassembly 3b. The function as a repeater that relays can be realized at the same time. Furthermore, it is possible to operate as a wavelength converter by changing the wavelength of the output optical signal of the optical transmission / reception subassemblies 3a and 3b.

  The present invention is not limited to the embodiment described above. For example, the connection positions of the drive circuit and the preamplifier in the optical transceiver modules 1, 31, 41 can be variously modified. For example, the preamplifiers of the optical transceiver modules 1 and 31 may be connected as one preamplifier to the output side of the switch SW1, and the drive circuit is connected to the output side of the branch point 12 or the output side of the switch SW2. You may connect as two drive circuits. In the optical transceiver module 41, the drive circuit may be connected to the input side of the switches SW3 and SW4, and the preamplifier may be connected to the output side of the switches SW5 and SW6.

  In the optical transceiver module 41 according to the third embodiment, a switch having the following three switching contacts may be employed. FIG. 7 is a diagram showing a schematic configuration of an optical transceiver module 71 which is a modified example in such a case. As shown in the figure, each of the switches SW73 and SW74 has another input terminal 72 and 74, and the input terminals 72 and 74 and the output terminals 73 and 75 can be connected to each other. Yes. Further, the switches SW75 and SW76 have another output terminals 77 and 79, respectively, and the output terminals 77 and 79 and the input terminals 76 and 78 can be connected to each other. The input terminal 72 of the switch SW73 is connected to the output terminal 77 of the switch SW75, and the input terminal 74 of the switch SW74 is connected to the output terminal 79 of the switch SW76. Here, the controller 7 controls the switches SW73, SW74, SW75, and SW76 to switch to the terminals 72, 74, 77, and 79, respectively. In this case, the output electric signal input to the switch SW75 from the optical transmission / reception subassembly 3a is transmitted to the switch SW75 and the switch SW73 and input to the optical transmission / reception subassembly 3a as an input electric signal. Similarly, the output electrical signal input to the switch SW76 from the optical transmission / reception subassembly 3b is transmitted to the switch SW76 and the switch SW74 and input to the optical transmission / reception subassembly 3b as an input electrical signal. Accordingly, since the optical signal transmitted from the other side of the optical transmission system is returned to the other side, it is possible to prevent the loss of the optical signal at the time of failure or the like.

  The optical transceiver module 41 may be added with a monitor function during operation as a repeater by changing the configuration of the switch. FIG. 8 is a diagram showing a schematic configuration of an optical transceiver module 81 which is a modified example in such a case. In the optical transceiver module 81 shown in the figure, switches SW85 and SW86 are connected instead of the switches SW5 and SW6. Each of the switches SW85 and SW86 has one input terminal 82 and 84 and one output terminal 83 and 85, and turns on / off the connection between the input and the output. The input terminal 82 of the switch SW85 is branched and connected to the wiring between the output terminal 11a of the optical transmission / reception subassembly 3a and the input terminal 16 of the switch SW1, and the output terminal 83 is connected to the input terminal 49 of the switch SW4. Has been. On the other hand, the input terminal 84 of the switch SW86 is branched and connected to the wiring between the output terminal 11b of the optical transmission / reception subassembly 3b and the input terminal 17 of the switch SW1, and the output terminal 85 is connected to the input terminal 47 of the switch SW3. It is connected.

  In such an optical transmission / reception module 81, any one of the output electrical signals output from the optical transmission / reception subassemblies 3a and 3b is output to the external output terminal via the switch SW1, thereby realizing a function as a repeater. However, the received signal from the optical transmission system can be monitored with a simple switch configuration.

  Furthermore, since the optical transceiver module 81 has only one external output terminal for monitoring, only one of the signals received by the two optical transceiver subassemblies 3a and 3b can be monitored, but the configuration as shown in FIG. Then, two optical transmission / reception subassemblies can be monitored simultaneously. In the optical transmission / reception module 91 shown in the figure, a switch SW92 is connected instead of the switch SW2. In the switch SW92, another output terminal 92 is added to the switch SW2, and the connection between one input terminal and three output terminals can be switched. The output terminal 92 of the SW 92 is branched and connected to the wiring between the output terminal 11a of the optical transmission / reception subassembly 3a and the input terminal 16 of the switch SW1. The output terminal 92 may be branched and connected to a wiring between the output terminal 11b of the optical transmission / reception subassembly 3b and the input terminal 17 of the switch SW1. In this case, when the external input terminal 13 is used for a monitor signal, a drive signal cannot be input to the optical transmission / reception module 91. However, when the external input terminal 13 is used as a repeater, a problem arises because the drive signal is not input. Absent.

(A) is a figure which shows the structure of the optical transmission / reception module which is 1st Embodiment of this invention, (b) is a figure which shows the connection relation of the duplex optical transmission system containing the optical transmission / reception module of (a). is there. It is a figure which shows the structure of the controller of FIG. It is a figure which shows the structure of the optical transmission / reception module which is 2nd Embodiment of this invention. (A) is a figure which shows the structure of the optical transmission / reception module which is 3rd Embodiment of this invention, (b) is a figure which shows the connection relation of the optical transmission system containing the optical transmission / reception module of (a). It is a block diagram which shows another switching state of the optical transmission / reception module of FIG. It is a block diagram which shows another switching state of the optical transmission / reception module of FIG. It is a figure which shows schematic structure of the optical transmission / reception module which is a modification of this invention. It is a figure which shows schematic structure of the optical transmission / reception module which is another modification of this invention. It is a figure which shows schematic structure of the optical transmission / reception module which is another modification of this invention. (A) is a figure which shows the structure of the conventional SFP type | mold optical transceiver, (b) is a figure which shows the connection relation of the optical transmission system containing the optical transceiver of (a). (A) is a figure which shows the structure of the optical transceiver which mounts the conventional BOSA, (b) is a figure which shows the connection relation of the optical transmission system containing the optical transceiver of (a).

Explanation of symbols

  1, 21, 31, 41, 71, 81, 91 ... optical transceiver module, 3a, 3b ... optical transceiver subassembly, 4a, 4b, 20b, 20m ... optical fiber, 5a, 5b, 45a, 45b ... preamplifier ( Amplifier circuit), 6 ... Drive circuit (drive circuit section), 7 ... Controller, 8a, 8b ... Light emitting element, 9a, 9b ... Light receiving element, SW1-6, SW73-76, SW85, SW86, SW92 ... Switch, SC1 ˜6 ... control signal, SI ... drive signal, SO ... output electric signal.

Claims (8)

A light emitting element that receives an input electrical signal and converts the input electrical signal into a first output optical signal, and receives the first input optical signal from a first optical fiber and converts the first input optical signal into a current. A first optical transmission / reception subassembly configured to cause the first output optical signal to enter the first optical fiber and convert the current into a first output electrical signal;
A light emitting element that receives the input electrical signal and converts the input electrical signal to a second output optical signal, and a second input optical signal that is received from a second optical fiber and converts the second input optical signal into a current. A second optical transmission / reception subassembly for converting the current into a second output electrical signal, and causing the second output optical signal to be incident on the second optical fiber;
Connected between an external input terminal and the inputs of the first and second optical transmission / reception subassemblies, and the input electrical to the first and second optical transmission / reception subassemblies based on a drive signal from the external input terminal A drive circuit unit for outputting a signal;
First and second inputs having first and second input terminals connected to outputs of the first and second optical transceiver subassemblies, respectively, and output terminals connected to external output terminals. A first switch for switching a connection between the terminal and the output terminal;
A controller for sending a control signal for controlling switching of the first switch unit;
An amplifier circuit unit that is connected in series with the first switch unit between the output of the first and second optical transmission / reception subassemblies and the external output terminal, and amplifies the output electrical signal;
An optical transceiver module comprising: An input terminal connected to the external input terminal; and first and second output terminals connected to inputs of the first and second optical transmission / reception subassemblies, respectively, the input terminal and the first And a second switch for switching the connection between the second output terminal and the second output terminal,
The controller also sends a control signal for controlling the switching of the second switch unit;
The optical transceiver module according to claim 1. A monitor unit for generating a monitor signal indicating a monitoring result of the first and second input optical signals or the first and second output optical signals;
The controller controls switching of the switch unit according to the monitor signal;
The optical transceiver module according to claim 1 or 2. A first input terminal connected to the first output terminal of the second switch section; a second input terminal; and an output terminal connected to an input of the first optical transmission / reception subassembly. A third switch section for switching the connection between the first and second input terminals and the output terminal;
A first input terminal connected to a second output terminal of the second switch section; a second input terminal; and an output terminal connected to an input of the second optical transceiver subassembly. A fourth switch section for switching the connection between the first and second input terminals and the output terminal;
A first output terminal connected to a first input terminal of the first switch section; a second output terminal connected to a second input terminal of the fourth switch section; An input terminal connected to the output of the optical transmission / reception subassembly, and a fifth switch section for switching the connection between the first and second output terminals and the input terminal;
A first output terminal connected to a second input terminal of the first switch section; a second output terminal connected to a second input terminal of the third switch section; and the second An input terminal connected to the output of the optical transmission / reception subassembly, further comprising a sixth switch unit for switching the connection between the first and second output terminals and the input terminal;
The drive circuit unit includes a first drive circuit connected to an input or output of the third switch unit, and a second drive circuit connected to an input or output of the fourth switch unit. ,
The amplifier circuit unit includes a first amplifier circuit connected to an input or output of the fifth switch unit, and a second amplifier circuit connected to an input or output of the sixth switch unit. ,
The controller also sends out a control signal for controlling the switching of the third to sixth switch units.
The optical transceiver module according to claim 2. Each of the third and fourth switch sections has a third input terminal,
The fifth and sixth switch sections have third output terminals connected to the third input terminals of the third and fourth switch sections, respectively.
Under the control of the controller, the output electrical signals input to the fifth and sixth switch sections are respectively input to the first and second switch as the input electrical signals via the third and fourth switch sections. Input to two optical transceiver subassemblies,
The optical transceiver module according to claim 4. A first input terminal connected to the first output terminal of the second switch section; a second input terminal; and an output terminal connected to an input of the first optical transmission / reception subassembly. A third switch section for switching the connection between the first and second input terminals and the output terminal;
A first input terminal connected to a second output terminal of the second switch section; a second input terminal; and an output terminal connected to an input of the second optical transceiver subassembly. A fourth switch section for switching the connection between the first and second input terminals and the output terminal;
An input terminal branched and connected to a wiring between the output of the first optical transmission / reception subassembly and the first switch unit, and an output connected to the second input terminal of the fourth switch unit A fifth switch portion having a terminal;
An input terminal branched and connected to a wiring between the output of the second optical transmission / reception subassembly and the first switch unit, and an output connected to the second input terminal of the third switch unit And a sixth switch part having a terminal,
The drive circuit unit includes a first drive circuit connected to an input or output of the third switch unit, and a second drive circuit connected to an input or output of the fourth switch unit. ,
The amplifier circuit unit includes a first amplifier circuit connected to an input or output of the fifth switch unit, and a second amplifier circuit connected to an input or output of the sixth switch unit. ,
The controller also sends out a control signal for controlling the switching of the third to sixth switch units.
The optical transceiver module according to claim 2. The second switch unit further includes a third output terminal, and the third output terminal is a wiring between the output of the first optical transmission / reception subassembly and the first switch unit, and Branched and connected to any one of the wires between the output of the second optical transceiver sub-assembly and the first switch unit,
The optical transceiver module according to claim 6. The controller stores a switching pattern indicating a plurality of patterns of connection between the input terminal side and the output terminal side of the switch unit in the memory, and generates a control signal for controlling switching of the switch unit based on the switching pattern. Generate,
The optical transceiver module according to any one of claims 1 to 7.

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