CN104678516B - Photoelectric device on basis of WDM (wavelength division multiplexing) - Google Patents
Photoelectric device on basis of WDM (wavelength division multiplexing) Download PDFInfo
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- CN104678516B CN104678516B CN201510090510.7A CN201510090510A CN104678516B CN 104678516 B CN104678516 B CN 104678516B CN 201510090510 A CN201510090510 A CN 201510090510A CN 104678516 B CN104678516 B CN 104678516B
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- 230000003287 optical effect Effects 0.000 claims abstract description 288
- 239000000835 fiber Substances 0.000 claims abstract description 74
- 230000005693 optoelectronics Effects 0.000 claims description 23
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052738 indium Inorganic materials 0.000 claims description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical group [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 2
- 230000001174 ascending effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004891 communication Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000009977 dual effect Effects 0.000 description 10
- 238000009434 installation Methods 0.000 description 9
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- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
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- 238000012986 modification Methods 0.000 description 3
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- 239000000463 material Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/29361—Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4215—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention discloses a photoelectric device on the basis of WDM (wavelength division multiplexing) and belongs to the field of optical communication. The photoelectric device comprises a detector, a curved surface reflection device, a WDM optical filter and a double-tail fiber device, wherein the curved surface reflection device is fixed above the WDM optical filter; in the optical axis direction of the detector, the detector is fixed on one side of the WDM optical filter and the double-tail fiber device is fixed on the other side of the WDM optical filter; in the optical axis direction, the optical axis of the detector and the optical axis of the double-tail fiber device are positioned on the same straight line. By applying the photoelectric device, time required for regulation can be shortened and regulating efficiency and a receiving effect can be improved.
Description
The present application is a divisional application of chinese patent application 201310196552.X entitled "wavelength division multiplexing-based optoelectronic device" proposed in 2013, 05, month 24.
Technical Field
The invention relates to the field of optical communication, in particular to a photoelectric device based on wavelength division multiplexing.
Background
In recent years, broadband networks such as Fiber-to-the-x (FTTx) based optical Fiber communication have been rapidly developed to provide users with high-speed voice, data, and video services. Cable Television (CATV) services are not supported in existing broadband networks. Therefore, in order to expand the application functions of the broadband network, it is necessary to upgrade the existing broadband network to support the CATV service, and to change the existing network as little as possible.
In an existing common upgrading method, CATV signals are broadcast at a central office of an Optical network, for example, at an Optical Line Terminal (OLT) of the Optical network, and an Optical component for receiving the CATV signals is disposed in an Optical-to-electrical device of an Optical Network Unit (ONU) of a user end.
Fig. 1 is a schematic structural diagram of a conventional optical electrical device based on wavelength division multiplexing. Referring to fig. 1, the photovoltaic apparatus includes: the detector comprises a detector 1, a shell 2, a Wavelength Division Multiplexer (WDM) optical filter 3, a collimator 4 and a double-tail fiber device 5, wherein the WDM optical filter 3, the collimator 4 and a part of the double-tail fiber device 5 are arranged in the shell 2, the outer diameter of the shell 2 is similar to the size of the detector 1, and the WDM optical filter 3 needs to be adjusted to a specific angle so as to achieve the purpose of reflecting optical signals (CATV signals and non-CATV signals) in a specific waveband from one tail fiber end of the double-tail fiber device 5 to the other tail fiber end.
An optical signal first transceiving port 6 (first tail fiber) in the double-tail fiber device 5 receives an uplink optical signal sent by an external ONU, the uplink optical signal is a non-CATV signal and is output to the collimator 4, the collimator 4 performs collimation processing to obtain uplink collimated (parallel) light, the uplink collimated light is output to the WDM optical filter 3, the WDM optical filter 3 reflects the received uplink collimated light and outputs the reflected uplink collimated light to the collimator 4, the collimator 4 performs collimation (convergence) processing again and outputs the light to an optical signal second transceiving port 7 (second tail fiber) in the double-tail fiber device 5, and the light is output to an optical network end through an optical signal second transceiving port 7 in the double-tail fiber device 5 and is finally transmitted to an OLT (optical line terminal) at an optical network office end.
The downstream optical signal transmitted by the optical network end, including CATV signal and non-CATV signal, is output to the second transceiving port 7 of the optical signal in the double pigtail 5, the second transceiving port 7 of the optical signal in the double pigtail 5 receives the downstream optical signal sent by the external OLT, and outputs the downstream optical signal to the collimator 4, and after being collimated by the collimator 4, the downstream collimated light is obtained, and the downstream collimated light is output to the WDM optical filter 3. Wherein,
for non-CATV signals, the WDM optical filter 3 reflects the received collimated light, outputs the collimated light to the collimator 4, performs collimation processing again, outputs the collimated light to the first transmitting/receiving port 6 of the optical signal in the double-pigtail fiber 5, and outputs the collimated light to the user-side ONU through the first transmitting/receiving port 6 of the optical signal in the double-pigtail fiber 5.
For CATV signals, the WDM optical filter 3 transmits the received collimated light and outputs the collimated light to the detector 1, and the detector 1 receives the CATV optical signals transmitted through the WDM optical filter 3, converts the CATV optical signals into electrical signals after processing, and outputs the electrical signals from pins to a user end.
The WDM optical filter 3 transmits CATV signals and reflects or totally reflects non-CATV signals, and may be implemented by providing different antireflection films according to wavelength characteristics of the CATV signals and the non-CATV signals. In practical application, the WDM optical filter 3 may be initially installed in the enclosure 2, and then, by fine-tuning the installation angle of the WDM optical filter 3, CATV signals are transmitted, and non-CATV signals are reflected or totally reflected, so that the optical signals converged by the collimator 4 may be converged to the corresponding pigtails in the dual pigtail 5.
It can be seen from the above that, in the existing wavelength division multiplexing-based optoelectronic device, the size of the tube shell is limited by assembly, the outer diameter is equivalent to that of the detector, and the tube wall of the tube shell cannot be too thin in consideration of the requirement of the mechanical strength of the optoelectronic device, so that the inner diameter of the tube shell is very limited, so that in the limited space in the tube shell, the adjustment margin is limited by adjusting the installation angle and position of the WDM optical filter, the angle adjustment is very difficult, the adjustment time is long, and the adjustment efficiency is low.
In addition, since the whole light path adopts a collimated light scheme, additional requirements are imposed on the detector, and a photoelectric chip for receiving a light signal in the detector is required to be positioned on a focal plane of a lens cap of the detector, otherwise, the optimal receiving effect cannot be realized.
Disclosure of Invention
Embodiments of the present invention provide an optoelectronic device based on wavelength division multiplexing, which reduces the time required for adjustment, and improves the adjustment efficiency and the receiving effect.
In order to achieve the above object, an embodiment of the present invention provides an optoelectronic device based on wavelength division multiplexing, including: a detector, a curved surface reflection device, a WDM optical filter, a double tail fiber device and a WDM optical filter tube body, wherein,
the WDM optical filter is arranged on a bracket in the WDM optical filter tube body, and a curved surface reflector is fixed on the upper part of the WDM optical filter tube body through an insulating material above the built-in WDM optical filter; and the detector is fixed on one side of the WDM optical filter tube body through an insulating material along the optical axis direction of the detector, and the double-tail fiber device is fixed on the other side of the WDM optical filter tube body.
Preferably, in the optical axis direction, the optical axis of the detector and the optical axis of the double tail fiber device are on the same straight line.
Preferably, the curved surface reflector is a concave surface reflector, the concave surface faces the WDM optical filter, the reflecting surface is a concave surface, and the focal length thereof is a designed specific value, so that the light emitted from the end surface of one of the two fiber core end surfaces of the double pigtail is reflected into the other fiber core end surface.
Preferably, the curved surface reflector is a convex surface reflector, the convex surface does not face the WDM optical filter, the back surface of the convex surface faces the WDM optical filter, the convex surface is a reflecting surface, and the focal length thereof is a designed specific value, so that the light emitted from the end surface of one of the two fiber core end surfaces of the double pigtail is reflected into the other fiber core end surface.
Preferably, the coated surface of the WDM optical filter faces the curved surface reflector, the uncoated surface faces the detector, and the included angle between the uncoated surface and the optical axis of the detector ranges from 38 degrees to 52 degrees.
Preferably, an included angle between a normal of the curved surface reflection device and the optical axis ranges from 83 degrees to 97 degrees.
Preferably, the detector is an indium gallium arsenic fast photodiode detector or an avalanche photodiode detector.
Preferably, the photosensitive surface of the detector for receiving the light signal is located out of the focal distance of the focal plane of the detector lens.
Preferably, a first pigtail in the dual pigtailer receives an upstream optical signal sent by an external optical network unit ONU, and transmits a downstream optical signal from the optical network and passing through the optoelectronic device to the ONU;
a second tail fiber in the double-tail fiber device receives a downlink optical signal from an optical network and transmits an uplink optical signal which is from an optical network unit ONU and passes through the photoelectric device to the optical network;
the detector receives CATV signals from the optical network, converts the CATV signals into electric signals and outputs the electric signals from the pins.
Preferably, a first pigtail in the dual pigtail receives an uplink optical signal sent by an external optical network unit ONU, outputs the uplink optical signal to a collimator, and outputs the uplink optical signal to a WDM optical filter after being collimated by the collimator, the WDM optical filter reflects the uplink optical signal to a reflection device, the reflection device reflects the uplink optical signal back to the WDM optical filter, the WDM optical filter reflects the uplink optical signal again, outputs the uplink optical signal to the collimator for convergence, outputs the uplink optical signal to a second pigtail in the dual pigtail, and outputs the uplink optical signal to an optical network end through the second pigtail in the dual pigtail;
the downlink optical signal transmitted by the optical network end is output to a second tail fiber in the double-tail fiber device and then output to the collimator, and the collimator performs collimation processing and then outputs to the WDM optical filter:
for non-CATV signals, the WDM optical filter reflects to the reflecting device, the reflecting device reflects back to the WDM optical filter, the WDM optical filter reflects again, the WDM optical filter outputs to the collimator for convergence, the first tail fiber in the double-tail fiber device is output, and the first tail fiber in the double-tail fiber device is output to the ONU;
for CATV signals, the WDM optical filter transmits and outputs the CATV signals to the detector, and the detector receives the CATV optical signals transmitted by the WDM optical filter, converts the CATV optical signals into electric signals after processing, and outputs the electric signals to a user end from a pin.
According to the technical scheme, the WDM optical filter is set as an independent element, and the reflector is arranged above the WDM optical filter to adjust the reflected light, so that the adjustment space of the reflector needing to be adjusted is increased, and the time required by adjustment is shortened; that is, the adjusting space possessed by the adjusting reflection device in the patent is more loose compared with the adjusting space possessed by the WDM filter of the prior art scheme, so that the adjustment becomes easier. Meanwhile, the WDM optical filter has larger installation space, so that the operation is more convenient during assembly.
Meanwhile, the non-collimated light technology is adopted, and a collimated light scheme is not adopted, so that the requirement on the detector is reduced, and particularly, the requirement on the position of a photoelectric chip for receiving the optical signal by the detector is reduced. The photoelectric chip in the detector does not need to be positioned on the focal plane of the lens cap of the detector, but only needs to be positioned outside the focal plane of the lens cap of the detector, and when the photoelectric device is manufactured, the optimal receiving effect of the detector can be realized by adjusting the distance from the detector to the double-tail fiber device, namely, adjusting the object distance.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other embodiments and drawings may be devised by those skilled in the art based on the exemplary embodiments shown in the drawings.
Fig. 1 is a schematic structural diagram of a conventional optical electrical device based on wavelength division multiplexing.
Fig. 2 is a schematic structural diagram of an optoelectronic device based on wavelength division multiplexing according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional structure diagram of an optoelectronic device based on wavelength division multiplexing according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The existing photoelectric device based on wavelength division multiplexing has the defects of difficult adjustment, long required time and low adjustment efficiency because the inner diameter of the tube shell is limited and the installation angle and the position of the WDM optical filter are adjusted in the tube shell.
Meanwhile, the collimating light technology adopted by the existing scheme puts higher requirements on the position of a photoelectric chip in the detector, and the device has the best effect of receiving CATV signals only when the photoelectric chip is positioned on the focal plane of a lens of the detector.
In consideration of the installation angle of the WDM optical filter, the CATV signal needs to be transmitted, and the non-CATV signal needs to be reflected, so that the adjustment is difficult, in the embodiment of the invention, the WDM optical filter is considered to be arranged as an independent element, namely, the WDM optical filter is not arranged in a tube shell, and a reflecting device is arranged above the WDM optical filter for adjusting the reflected light, so that the adjustment space of a reflecting component needing to be adjusted is increased, and the time required by adjustment is reduced; that is, the adjusting space possessed by the adjusting reflection device in the patent is more loose compared with the adjusting space possessed by the WDM filter of the prior art scheme, so that the adjustment becomes easier. Meanwhile, the WDM optical filter has larger installation space, so that the operation is more convenient during assembly.
Meanwhile, the non-collimated light technology is adopted, so that the requirement on the detector is also reduced. The photoelectric chip in the detector is not required to be positioned on the focal plane of the lens cap of the detector, and the photoelectric chip is only required to be positioned outside the focal plane of the lens cap of the detector.
Fig. 2 is a schematic structural diagram of an optoelectronic device based on wavelength division multiplexing according to an embodiment of the present invention. Referring to fig. 2, the photovoltaic apparatus includes: a detector 21, a curved surface reflection device 22, a WDM optical filter 23, a double tail fiber device 25 and a WDM optical filter tube 26, wherein,
the WDM optical filter 23 is arranged in the bracket in the WDM optical filter tube 26, and the curved surface reflector 22 is fixed on the upper part of the WDM optical filter tube 26 through an insulating material above the built-in WDM optical filter 23; along the optical axis (radial direction) direction of the detector 21, the detector 21 is fixed on one side of the WDM optical filter tube 26 through an insulating material, the double-pigtail device 25 is fixed on the other side of the WDM optical filter tube 26, and the optical axis of the detector 21 and the optical axis of the double-pigtail device 25 are in the same straight line.
Preferably, the curved reflecting device 22 is a concave mirror, the concave surface faces the WDM filter, and the reflecting surface is a concave surface, and the focal length thereof is a designed specific value, so that the light emitted from the end surface of one of the two core end surfaces of the double pigtail can be reflected into the other core end surface.
In practical application, the curved surface reflector 22 may also be a convex surface reflector, the convex surface does not face the WDM optical filter, the back surface of the convex surface faces the WDM optical filter, the convex surface is a reflective surface, and the focal length of the reflective surface is a designed specific value, so that the light emitted from the end surface of one of the two fiber core end surfaces of the double-pigtail fiber is reflected into the other fiber core end surface.
In the embodiment of the present invention, two fiber cores are disposed in the dual pigtail device 25, and two pigtails with pigtail heads are formed outside or inside the dual pigtail device 25 through branching processing, and the pigtails are respectively connected to an external optical network terminal (OLT) and a user terminal (ONU). The bifurcation may be disposed at the end of the double-pigtail device 25, i.e. at the interface with the outside, or may be disposed inside the double-pigtail device 25, i.e. the pigtail extends into the double-pigtail device 25, and two fiber cores are formed by bifurcation.
In practical applications, the optical interface device may be a clamping type Square (SC) plug type or a clamping type circular (LC) plug type as a common input/output port of the optoelectronic device, or a clamping type square/micro-sphere grinding and polishing (SC/PC) pigtail type, a clamping type square/oblique angle and micro-sphere grinding and polishing (SC/APC) pigtail type, or a clamping type circular/oblique angle and micro-sphere grinding and polishing (LC/APC) pigtail type, so as to connect with an optical port of an external network, thereby implementing a single-fiber bidirectional transmission function.
Preferably, the detector may be a PIN (Positive-intrinsic-negative) detector, or an Avalanche Photodiode (APD) detector.
Preferably, the light-sensitive surface of the detector for receiving the light signal is located out of the focal distance of the detector lens focal plane.
Preferably, the WDM filter body is in the shape of a hexahedron, and it should be noted that the hexahedron shape adopted by the WDM filter body is only an example, and all shapes that can fix the WDM filter and the reflection device respectively and make the reflection device located at the upper end of the WDM filter fall within the protection scope of the present invention.
In practical applications, before the detector 21 is fixed to one side of the WDM filter body 26 by the insulating material 28, the detector 21 may be positioned: after the WDM optical filter 23 is installed according to the preset angle, the external CATV signal is accessed through the double tail fiber 25 and output to the WDM optical filter 23, the WDM optical filter 23 transmits the CATV signal and outputs to the detector 21, the CATV optical signal received by the detector 21 is enabled to be the strongest through micro-adjustment of the detector 21, and then the detector 21 is fixed. In the embodiment of the present invention, the fixing manner of fixing the detector 21 on the WDM optical filter tube 26 side by the insulating material is only exemplary, and any other fixing manner and fixing material capable of fixing the detector 21 on the WDM optical filter tube 26 side fall within the protection scope of the present invention.
In the embodiment of the present invention, the curved surface reflection device 22 is fixed on the upper portion of the WDM optical filter tube 26 through the insulating material 29, and before the fixing, the curved surface reflection device 22 may be positioned: after the WDM optical filter 23 is installed at a preset angle, an external non-CATV signal is accessed through one pigtail of the double pigtail 25 and output to the WDM optical filter 23, the WDM optical filter 23 reflects the non-CATV signal and outputs to the curved surface reflection device 22 at the upper part, the received non-CATV signal is converged by the curved surface reflection device 22 and then reflected to the WDM optical filter 23, the WDM optical filter 23 reflects again, and the received non-CATV signal is reflected to the other pigtail of the double pigtail 25. The curved reflecting device 22 is fixed after the non-CATV optical signal reflected back to the other pigtail of the double pigtail 25 is maximized by finely adjusting the installation angle and position of the curved reflecting device 22. In the embodiment of the present invention, the fixing manner of fixing the curved surface reflection device 22 on the upper portion of the WDM optical filter tube 26 by using the insulating material is only exemplary, and any fixing manner and fixing material capable of fixing the curved surface reflection device 22 on the upper portion of the WDM optical filter tube 26 fall within the protection scope of the present invention.
In the embodiment of the present invention, the optoelectronic device may be applied to an Ethernet Passive Optical Network (EPON) system or a Gigabit Passive Optical Network (GPON) system, where a wavelength of an uplink Optical signal output by an Optical Network Unit (ONU) is 1310nm, a wavelength of a non-CATV Optical signal in a downlink Optical signal output by an OLT is 1490nm, and a wavelength of a CATV signal in the downlink Optical signal is 1550 nm. The WDM filter 23 transmits the CATV signal at 1550nm, and reflects the upstream optical signal at 1310nm and the downstream optical signal at 1490 nm.
Preferably, the WDM filter 23 has good total reflection characteristic for 1260-1360 nm and 1480-1500 nm optical signals; the CATV optical fiber has good transmission characteristic for CATV optical signals of 1550-1560 nm.
The structures of the detector 21, the WDM filter 23, and the double pigtail 25 and their operation flow are prior art, and detailed descriptions thereof are omitted here.
Fig. 3 is a schematic cross-sectional structure diagram of an optoelectronic device based on wavelength division multiplexing according to an embodiment of the present invention. Referring to fig. 3, the cut-away optoelectronic device comprises: a detector 21, a curved reflector 22, a WDM filter 23 and a double pigtailer 25, wherein,
in the optical axis direction, the detector 21 is located on the left side of the double-pigtail 25, the optical axis of the detector 21 and the optical axis of the double-pigtail 25 are on the same straight line, the detector 21 is used for receiving CATV optical signals transmitted from the WDM optical filter 23, converting the received CATV optical signals into electrical signals, and then connecting the electrical signals into an external circuit through pins of the detector 21;
the dual pigtail device 25 has two pigtails, which are a first pigtail and a second pigtail, respectively, the two pigtails are arranged at an internal port of the dual pigtail device 25, and are respectively used for connecting an external optical network end and a user end, an uplink optical signal output by the user end is received through the first pigtail and is output to the WDM optical filter 23, the WDM optical filter 23 reflects the received uplink optical signal to the curved surface reflection device 22, the curved surface reflection device 22 converges the received uplink optical signal and reflects the received uplink optical signal back to the WDM optical filter 23, the WDM optical filter 23 reflects again and inputs the second pigtail, and the received uplink optical signal is output to the optical network end through the second pigtail; and receiving the downlink optical signal output by the optical network end through the second tail fiber, outputting the downlink optical signal to the WDM optical filter 23, reflecting the received downlink optical signal to the curved surface reflection device 22 by the WDM optical filter 23, converging the received downlink optical signal by the curved surface reflection device 22, reflecting the received downlink optical signal back to the WDM optical filter 23 again by the WDM optical filter 23, inputting the received downlink optical signal into the first tail fiber, and outputting the received downlink optical signal to the user end through the first tail fiber.
In the embodiment of the present invention, the fiber cores of the two pigtails in the dual pigtail device 25 can share one ceramic sheath, and the fiber cores of the first pigtail and the second pigtail are both close to the optical axis of the detector 21. Thus, the optical signals transmitted through the first and second pigtails are directed to the WDM optical filter 23 for transmission or reflection; the optical signal reflected by the WDM optical filter 23 is converged to the second pigtail or the first pigtail by the convergence of the curved surface reflection device 22 and the re-reflection of the WDM optical filter 23, and then output to the outside through the second pigtail or the first pigtail. That is, the optical signal from the pigtail connected to the optical network end or the subscriber end is directed to the WDM optical filter 23. Wherein, if the optical signal is CATV optical signal, the optical signal is transmitted to the detector 21 by the WDM optical filter 23; if the optical signal is a non-CATV optical signal, the optical signal is reflected to the curved surface reflection device 22 by the WDM optical filter 23, is converged and reflected by the curved surface reflection device 22, then is emitted to the WDM optical filter 23 again, is reflected by the WDM optical filter 23 again, enters the first tail fiber or the second tail fiber, and is transmitted to the outside.
In the embodiment of the present invention, by adjusting the installation angle and the position of the curved surface reflection device 22, the position where the optical signal is converged on the plane of the WDM optical filter 23 can be changed, and the optical signal can be converged on the fiber core of the first pigtail or the second pigtail after being reflected by the WDM optical filter 23.
The WDM filter 23 is located between the detector 21 and the double pigtail 25, with the coated side facing the curved reflector 22 and the uncoated side facing the detector 21. The mounting angle, i.e. the angle between the non-coated surface and the extension of the optical axis of the detector 21, is. The coated surface is used for separating non-CATV signals and CATV signals: after receiving the non-CATV signal in the uplink optical signal or the downlink optical signal output by the double pigtail 25, the non-CATV signal is reflected to the curved surface reflection device 22, and is converged and reflected by the curved surface reflection device 22, and then is emitted to the WDM optical filter 23 again, and the WDM optical filter 23 receives the optical signal returned by the curved surface reflection device 22, and outputs the optical signal to the double pigtail 25 after being reflected again; after receiving the CATV signal in the downstream optical signal output by the double pigtailer 25, the CATV signal is transmitted to the detector 21;
in the embodiment of the present invention, the WDM optical filter 23 has a characteristic of transmitting all CATV optical signals and reflecting all non-CATV optical signals.
The curved surface reflector 22 is arranged at the upper end of the WDM optical filter 23, and the included angle between the normal of the curved surface reflector 22 and the optical axis is. The curved surface reflection device is used for collecting and reflecting the non-CATV signals output by the WDM optical filter 23 and reflecting the non-CATV signals to the WDM optical filter 23.
Preferably, the curved reflecting device 22 is a concave mirror, the concave surface faces the WDM filter, and the reflecting surface is a concave surface, and the focal length thereof is a specific value designed so that the light emitted from the end surface of one of the two core end surfaces of the double pigtail is reflected into the other core end surface. Alternatively, the curved surface reflector 22 is a convex surface reflector, the convex surface does not face the WDM optical filter, the back surface of the convex surface faces the WDM optical filter, the convex surface is a reflecting surface, and the focal length thereof is a designed specific value, so that the light emitted from the end surface of one of the two core end surfaces of the twin pigtail is reflected into the other core end surface.
Preferably, the first and second liquid crystal films are made of a polymer,the value range of the (A) is 38-52 degrees,the value range of (A) is 83-97 degrees.
The following describes the workflow of the wavelength division multiplexing-based optoelectronic device according to the embodiment of the present invention in detail.
The first tail fiber in the double-tail fiber device 25 receives the upstream optical signal sent by the external ONU, the upstream optical signal is a non-CATV signal and is output to the WDM optical filter 23, the WDM optical filter 23 reflects the received non-CATV signal to the curved surface reflection device 22, the curved surface reflection device 22 converges the received non-CATV signal and reflects the converged non-CATV signal back to the WDM optical filter 23, the WDM optical filter 23 reflects the received non-CATV signal again and outputs the non-CATV signal to the second tail fiber in the double-tail fiber device 25, and the non-CATV signal is output to the optical network end through the second tail fiber in the double-tail fiber device 25 and finally reaches the optical network office end OLT. Thus, the non-CATV signal received by the first pigtail can be output to the WDM optical filter 23 in a point manner, and then input to the second pigtail in a point manner by convergence and reflection of the curved surface reflection device 22 and re-reflection of the WDM optical filter 23.
The downstream optical signal transmitted by the optical network (from the optical network office OLT) including the CATV signal and the non-CATV signal is output to the second pigtail in the double pigtail 25, and the second pigtail in the double pigtail 25 receives the downstream optical signal from the external OLT and outputs the downstream optical signal to the WDM optical filter 3. Wherein,
for non-CATV signals, the WDM optical filter 23 reflects the received non-CATV signals to the curved surface reflection device 22, the curved surface reflection device 22 converges the received non-CATV signals and reflects the non-CATV signals back to the WDM optical filter 23, and the WDM optical filter 23 reflects the received non-CATV signals again and outputs the non-CATV signals to the first tail fiber in the dual-tail fiber device 25, and outputs the non-CATV signals to the user end ONU through the first tail fiber in the dual-tail fiber device 25.
For CATV signals, the WDM optical filter 23 transmits the received CATV signals and outputs the signals to the detector 21, and the detector 21 receives the CATV optical signals transmitted through the WDM optical filter 23, converts the signals into electrical signals after processing, and outputs the electrical signals from pins to a user end.
As can be seen from the above description, in the embodiments of the present invention, the WDM optical filter is provided as an independent element, and the reflective device is provided above the WDM optical filter to adjust the reflected light, so that the adjustment space of the reflective component to be adjusted is increased, and the time required for adjustment is reduced; that is, the adjusting space possessed by the adjusting reflection device in the patent is more loose compared with the adjusting space possessed by the WDM filter of the prior art scheme, so that the adjustment becomes easier. Meanwhile, the WDM optical filter has larger installation space, so that the operation is more convenient during assembly.
Meanwhile, the non-collimated light technology is adopted, and a collimated light scheme is not adopted, so that the requirement on the detector is reduced, and particularly, the requirement on the position of a photoelectric chip for receiving the optical signal by the detector is reduced. The photoelectric chip in the detector does not need to be positioned on the focal plane of the lens cap of the detector, but only needs to be positioned outside the focal plane of the lens cap of the detector, and when the photoelectric device is manufactured, the optimal receiving effect of the detector can be realized by adjusting the distance from the detector to the double-tail fiber device, namely, adjusting the object distance.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also encompasses these modifications and variations.
Claims (9)
1. An optoelectronic device based on Wavelength Division Multiplexing (WDM), comprising: a detector, a curved surface reflecting device, a WDM optical filter and a double-tail fiber device, wherein,
the WDM optical filter is arranged in the WDM optical filter tube body, and above the WDM optical filter, the curved surface reflecting device is fixed at the upper part of the WDM optical filter tube body; the detector is fixed on one side of the WDM optical filter tube body along the optical axis direction of the detector, and the double-pigtail device is fixed on the other side of the WDM optical filter tube body;
in the direction of an optical axis, the optical axis of the detector and the optical axis of the double-tail fiber device are on the same straight line;
the ascending optical signal received by the first tail fiber of the double-tail fiber device is output to the WDM optical filter, reflected to the curved surface reflection device, converged and reflected back to the WDM optical filter, reflected again and input to the second tail fiber of the double-tail fiber device; and the downlink optical signal received by the second tail fiber is output to the WDM optical filter, reflected to the curved surface reflection device, converged and reflected back to the WDM optical filter, reflected again and input to the first tail fiber.
2. The optoelectronic apparatus of claim 1, wherein the curved reflecting device is a concave mirror facing the WDM filter, the reflecting surface is a concave surface having a focal length designed to reflect light exiting from one of the two core facets of the double pigtail into the other core facet.
3. The optoelectronic apparatus of claim 1, wherein the curved reflecting device is a convex mirror, the convex surface is not facing the WDM filter, the back surface of the convex surface is facing the WDM filter, and the convex surface is a reflecting surface, and the focal length thereof is designed to be a specific value so that the light exiting from the end surface of one of the two core end surfaces of the twin pigtail is reflected into the other core end surface.
4. The optoelectronic apparatus of claim 2 or 3, wherein the coated surface of the WDM filter faces the curved reflector, the uncoated surface faces the detector, and the angle between the uncoated surface and the optical axis of the detector is in the range of 38 ° to 52 °.
5. The optoelectronic apparatus of claim 4, wherein the angle between the normal to the curved reflector and the optical axis is in the range of 83 ° -97 °.
6. The optoelectronic apparatus of claim 2 or 3, wherein the detector is an indium gallium arsenic fast photodiode detector or an avalanche photodiode detector.
7. An optoelectronic apparatus according to claim 6, wherein the photosurface of the detector that receives the optical signal is located out of the focal distance of the detector lens focal plane.
8. Optoelectronic device according to claim 4,
a first tail fiber in the double-tail fiber device receives an uplink optical signal sent by an external optical network unit ONU and transmits a downlink optical signal from an optical network and passing through the photoelectric device to the ONU;
a second tail fiber in the double-tail fiber device receives a downlink optical signal from an optical network and transmits an uplink optical signal which is from an optical network unit ONU and passes through the photoelectric device to the optical network;
the detector receives CATV signals from the optical network, converts the CATV signals into electric signals and outputs the electric signals from the pins.
9. The optoelectronic device of claim 8,
for non-CATV signals, the WDM optical filter reflects to the reflection device, the reflection device reflects back to the WDM optical filter, the WDM optical filter reflects again, outputs to the first tail fiber in the double-tail fiber device, and outputs to the ONU through the first tail fiber in the double-tail fiber device;
for CATV signals, the WDM optical filter transmits and outputs the CATV signals to the detector, and the detector receives the CATV optical signals transmitted by the WDM optical filter, converts the CATV optical signals into electric signals after processing, and outputs the electric signals to a user end from a pin.
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| CN201310196552.XA CN103268003B (en) | 2013-05-24 | 2013-05-24 | Photoelectronic device based on wavelength division multiplexing |
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| CN1447141A (en) * | 2002-03-27 | 2003-10-08 | 松下电器产业株式会社 | Photo complexing assembly, lightwave length complexer/decomplexer and mfg. method of photo complexing assembly |
| CN202679371U (en) * | 2012-07-23 | 2013-01-16 | 青岛海信宽带多媒体技术有限公司 | Optical network unit optical assembly with optical time domain reflection function |
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| CN1447141A (en) * | 2002-03-27 | 2003-10-08 | 松下电器产业株式会社 | Photo complexing assembly, lightwave length complexer/decomplexer and mfg. method of photo complexing assembly |
| CN202679371U (en) * | 2012-07-23 | 2013-01-16 | 青岛海信宽带多媒体技术有限公司 | Optical network unit optical assembly with optical time domain reflection function |
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