CN112448759A - Optical fiber relay remote transmission system for remote signaling of launching field arrow - Google Patents
Optical fiber relay remote transmission system for remote signaling of launching field arrow Download PDFInfo
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- CN112448759A CN112448759A CN202011447991.XA CN202011447991A CN112448759A CN 112448759 A CN112448759 A CN 112448759A CN 202011447991 A CN202011447991 A CN 202011447991A CN 112448759 A CN112448759 A CN 112448759A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25758—Optical arrangements for wireless networks between a central unit and a single remote unit by means of an optical fibre
- H04B10/25759—Details of the reception of RF signal or the optical conversion before the optical fibre
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0779—Monitoring line transmitter or line receiver equipment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses an optical fiber relay remote transmission system for transmitting field arrow remote signals, which can improve the optical fiber relay remote transmission quality of transmitting field remote measurement signals. The system specifically comprises: and the oscillating bar antenna captures an arrow remote signal to enter an oscillating bar link. The swing rod link consists of a microwave combiner, a first microwave assembly and a first optical transmitter which are connected in sequence; the omnidirectional antenna captures arrow remote signals and accesses an omnidirectional antenna link, and the omnidirectional antenna link is composed of a second microwave assembly and a second optical transmitter which are sequentially connected. The 1.8m antenna receiving link comprises an optical receiver, a microwave switch, a remote measuring receiver and a 1.8m wire; wherein the optical receiver, the remote measuring receiver and the 1.8m wire are all connected to the microwave switch. The swing link, the omnidirectional antenna link and the 1.8m antenna receiving link are all connected to the inter-link switching device, and the link switching device is used for switching and combining the links.
Description
Technical Field
The invention relates to the technical field of telemetering signal transmission, in particular to an optical fiber relay remote transmission system for remote signals of a launch rocket.
Background
At present, launching field telemetry equipment arranged at a designated place is used for receiving rocket remote signals from a rocket in a launching task in a microwave communication mode, so as to realize state monitoring of the rocket. The launching task requires that the telemetering equipment receives the arrow remote signals in a designated time interval and a task arc section in a high-quality mode. Because partial mountain body shielding exists between the telemetering equipment and the launching rack and the telemetering equipment cannot see through, at some time points during a task, the quality of a signal received by the telemetering equipment is poor, and signal interruption occurs in severe cases.
Therefore, the task of receiving the launching field telemetry equipment is suitable for the low transmission quality of the telemetry signal of the launcher rocket, and the problem to be solved at present is urgent.
Disclosure of Invention
In view of this, the invention provides an optical fiber relay remote transmission system for launch site arrow remote signals, which can improve the quality of optical fiber relay remote transmission of launch site remote measurement signals.
In order to achieve the purpose, the technical scheme of the invention is as follows: a transmitting field arrow remote signal optical fiber relay remote transmission system comprises a swing rod antenna, a swing rod link, an omnidirectional antenna link, a 1.8-meter antenna receiving link and a link switching device.
The swing link comprises a left-handed swing link and a right-handed swing link.
Arrow remote signals captured by the oscillating bar antenna comprise a plurality of paths of arrow remote signals in a left-handed polarization form and a plurality of paths of arrow remote signals in a right-handed polarization form, wherein the plurality of paths of arrow remote signals in the left-handed polarization form are accessed into the left-handed oscillating bar link, and the plurality of paths of arrow remote signals in the right-handed polarization form are accessed into the right-handed oscillating bar link.
The swing link is composed of a microwave combiner, a first microwave assembly and a first optical transmitter; the output end of the microwave combiner is connected to the input end of the first microwave assembly, and the output end of the first microwave assembly is connected to the first optical transmitter.
The omni-directional antenna links include left-handed omni-directional antenna links and right-handed omni-directional antenna links.
Arrow remote signals captured by the omnidirectional antenna comprise arrow remote signals in a left-handed polarization form and arrow remote signals in a right-handed polarization form, and are correspondingly connected to the left-handed omnidirectional antenna link and the right-handed omnidirectional antenna link respectively;
the omnidirectional antenna link is composed of a second microwave component and a second optical transmitter which are connected in sequence.
The 1.8m antenna receiving link comprises an optical receiver, a microwave switch, a remote measuring receiver and a 1.8m wire; wherein the optical receiver, the remote measuring receiver and the 1.8m wire are all connected to the microwave switch.
The swing link, the omnidirectional antenna link and the 1.8m antenna receiving link are all connected to the link switching device, and the link switching device switches and combines all the links.
Further, the first microwave assembly and the second microwave assembly are identical in structure and comprise microwave circuits and monitoring circuits.
The microwave circuit comprises a filter, a step attenuator, an amplifier and a power divider which are connected in sequence.
The monitoring circuit comprises a current detection circuit and a power detection circuit.
Arrow remote signals received by the swing rod antenna are processed by the filter, the step attenuator and the amplifier to obtain swing rod output microwave signals, the swing rod output microwave signals are divided into 2 paths by the power divider, one path is used as output signals of the first microwave component, and the other path is input to the power detection circuit.
The current detection circuit is an AD8211 chip and is used for detecting the current of the microwave circuit.
The power detection circuit detects the power of the output microwave signal and monitors the output power of the first microwave assembly.
Multipath microwave signals received by the oscillating bar antennas in the same oscillating bar link enter the microwave combiner, output signals are sent to the first microwave assembly, and finally optical signals suitable for optical cables to carry out remote transmission are formed after the signals are processed by the first optical transmitter.
The output end of the first optical transmitter is connected to the receiving end link switching device through the swing rod mode optical cable.
Further, the microwave assembly comprises a microwave circuit and a monitoring circuit.
The microwave circuit comprises a filter, a step attenuator, an amplifier and a power divider which are connected in sequence.
The monitoring circuit comprises a current detection circuit and a power detection circuit.
Arrow remote signals received by the omnidirectional antenna are processed by a filter, a step attenuator and an amplifier to obtain omnidirectional output microwave signals, the omnidirectional output microwave signals are divided into 2 paths by a power divider, one path is used as output signals of the second microwave component, and the other path is input to a power detection circuit.
The current detection circuit chip is AD8211 and is used for detecting current of the microwave circuit.
The power detection circuit detects the power of the output microwave signal and monitors the output power of the microwave assembly.
The microwave output signal of the second microwave module is converted into an optical signal by a second optical transmitter.
The output of the second optical transmitter is connected to the link switching device via an omni-directional mode optical cable.
Further, the link switching device is an optical switch.
Has the advantages that:
the optical fiber relay remote transmission system for the rocket remote signal in the transmitting field realizes space butt joint (the polarization form comprises left-handed polarization and right-handed polarization) between the omnidirectional antenna and the rocket remote transmitting antenna and the pendulum rod antenna, further combines and adjusts the received signals according to the polarization form, and finally realizes optical fiber transmission through the optical transmitter. Meanwhile, the rapid switching among the oscillating bar link, the omnidirectional antenna link and the 1.8m antenna receiving link can be realized, so that the optical fiber relay remote transmission quality of the transmitting field remote measurement signal is improved in an all-round manner, and the system equipment is simple, light and convenient to deploy.
Drawings
Fig. 1 is a structural diagram of a transmitting field arrow remote signal optical fiber relay remote transmission system provided by the invention.
FIG. 2 is a detailed structural diagram of a microwave module in an optical fiber relay remote transmission system for transmitting field arrow remote signals according to the present invention;
FIG. 3 is a circuit diagram of an embodiment of a monitoring circuit according to the present invention;
FIG. 4 is a flowchart of a single chip in a circuit according to an embodiment of the present invention;
fig. 5 is a structural diagram of a microwave combiner according to an embodiment of the present invention;
fig. 6 is a front panel structure diagram of the microwave combiner according to the embodiment of the present invention;
fig. 7 is a schematic diagram of an optical switch according to an embodiment of the present invention.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention provides an optical fiber relay remote transmission system for rocket remote signals in a transmitting field, which is structurally shown in figure 1 and comprises a swing rod antenna, a swing rod link, an omnidirectional antenna link, a 1.8-meter antenna receiving link and a link switching device.
The swing link comprises a left-handed swing link and a right-handed swing link.
Arrow remote signals captured by the oscillating bar antenna comprise a plurality of paths of arrow remote signals in a left-handed polarization form and a plurality of paths of arrow remote signals in a right-handed polarization form, wherein the plurality of paths of arrow remote signals in the left-handed polarization form are accessed into the left-handed oscillating bar link, and the plurality of paths of arrow remote signals in the right-handed polarization form are accessed into the right-handed oscillating bar link.
The swing link consists of a microwave combiner, a first microwave assembly and a first optical transmitter (namely, both the left-handed swing link and the right-handed swing link are formed); the output end of the microwave combiner is connected with the input end of the first microwave assembly, and the output end of the first microwave assembly is connected to the first optical transmitter. As shown in fig. 1, n arrow remote signals in a left-handed polarization form in the left-handed swing link enter the microwave combiner of the left-handed swing link for combining, and n arrow remote signals in a right-handed polarization form in the right-handed swing link enter the microwave combiner of the right-handed swing link for combining.
The omni-directional antenna links include left-handed omni-directional antenna links and right-handed omni-directional antenna links.
Arrow remote signals captured by the omnidirectional antenna comprise a path of arrow remote signals in a left-handed polarization form and a path of arrow remote signals in a right-handed polarization form, and are correspondingly connected to the left-handed omnidirectional antenna link and the right-handed omnidirectional antenna link respectively.
The omnidirectional antenna link is composed of a second microwave component and a second optical transmitter which are connected in sequence (namely, both the left-handed omnidirectional antenna link and the right-handed omnidirectional antenna link are composed).
The 1.8m antenna receiving link comprises an optical receiver, a microwave switch, a remote measuring receiver and a 1.8m wire; wherein the optical receiver, the remote measuring receiver and the 1.8m wire are all connected to the microwave switch.
The swing link, the omnidirectional antenna link and the 1.8m antenna receiving link are all connected to the link switching device, and the link switching device switches and combines all the links.
The basic working modes of the system comprise the following three modes
(1) Pendulum rod working mode
The rocket remote signal is received by the swing rod antenna, pre-amplification is carried out, the rocket remote signal is fed to the microwave combiner through the microwave cable, the output of the combiner is sent to the first optical transmitter after signal conditioning is carried out on the signal by the first microwave assembly, the optical signal output by the transmitter is sent to the optical receiver of the remote measuring equipment through the swing rod mode optical cable to be demodulated to obtain the remote measuring signal, and the remote measuring signal is sent to the remote measuring equipment to be demodulated.
(2) Omnidirectional mode of operation
The omnidirectional antenna receives the arrow remote signals, the arrow remote signals are fed to the second microwave component through the microwave cable to be amplified and adjusted and then sent to the second optical transmitter, the optical signals output by the transmitter are sent to the optical receiver of the telemetering equipment through the omnidirectional mode optical cable to be demodulated into telemetering signals, and the telemetering equipment is sent to be demodulated.
(3) Combined mode of operation
Typically a combination of a pendulum mode of operation, an omni-directional mode of operation and a 1.8m antenna mode. The conversion between the swing rod working mode and the omnidirectional working mode is switched by the optical switch; the switching between the swing rod working mode and the omnidirectional working mode and the 1.8m antenna mode is realized by the combination switching of the microwave switches.
In an embodiment of the present invention, the microwave assembly comprises a microwave circuit and a monitoring circuit, as shown in fig. 2.
The microwave circuit comprises a filter, a step attenuator, an amplifier and a power divider which are connected in sequence; wherein a 12V secondary power supply may be used to charge the step attenuator and amplifier.
The monitoring circuit comprises a current detection circuit and a power detection circuit;
arrow remote signals received by the oscillating bar antenna are processed by a filter, a step attenuator and an amplifier to obtain oscillating bar output microwave signals, the oscillating bar output microwave signals are divided into 2 paths by a power divider, one path is used as output signals of the first microwave component, and the other path is input to a power detection circuit;
the current detection circuit is an AD8211 chip and is used for detecting the current of the microwave circuit; in the embodiment of the invention, the AD8211 chip is adopted for current detection, and the sampling resistor is selected to be 0.2 ohm. The current sense output voltage is about 4 times the operating current. Thus, a current range of less than 1.2A can be detected.
The power detection circuit is used for carrying out power detection on the output microwave signal and monitoring the output power of the first microwave assembly; in the embodiment of the invention, the AD8313 circuit is adopted for power detection, the detection voltage and the dB value of the detection power are in a linear relation, and the detection power is dynamic 60 dB. In the microwave circuit, an output circuit equally divides a microwave signal into 2 paths by using a power divider, one path is output by a microwave component, and the other path is used for power detection, so that the detected power is the output power of the microwave component.
In the embodiment of the invention, a specific monitoring circuit is shown in fig. 3, and the singlechip adopts AT89C51 series, has an A/D channel, a GPIO port and a serial port, and can complete A/D acquisition, control output and display interfaces.
A signal conditioning circuit is arranged at the front end of the A/D circuit and used for adjusting, isolating and driving the amplitudes of the detection voltage and the current detection voltage.
The current detection adopts an AD8211 chip, and the sampling resistance is 0.2 ohm. The current sense output voltage is about 4 times the operating current. Thus, a current range of less than 1.2A can be detected.
An AD8313 circuit is adopted for power detection, detection voltage is in a linear relation to the dB value of detection power, and the detection power is dynamic 60 dB. In the microwave circuit, an output circuit equally divides a microwave signal into 2 paths by using a power divider, one path is output by a microwave component, and the other path is used for power detection, so that the detected power is the output power of the microwave component.
The display device adopts an SO12864-12C (LCM) type liquid crystal module, and the display size of the liquid crystal display screen is as follows: 16.62mm 30.7mm, 128 columns 64 rows of dot matrix monochrome pictures can be displayed.
The liquid crystal display content is as follows:
operating Current XXXXmA
Output level + -XXdBm
Attenuation values XX dB
The Chinese characters show 16-by-16 lattice, and the arrays and letters adopt 16-by-8 lattice.
The liquid crystal display module is small in size and can be embedded in a panel of the microwave assembly.
The liquid crystal display module is directly connected with the IO port of the singlechip.
The singlechip system uses an internal memory to store the control state parameters of the attenuator. And calling the storage parameters and implementing control when the computer is started next time, and keeping the system state unchanged when the computer is restarted due to unexpected power failure.
The attenuation control key adopts plus or minus 2 keys for increasing attenuation and reducing attenuation. The attenuation control is stepped by 1dB and the system initially defaults to 15 dB.
The processing content of the single chip microcomputer program is mainly as follows:
(1) and starting and initializing the singlechip. Including the clearing of the liquid crystal.
(2) And calling control parameters and binding.
(3) And collecting current detection voltage, converting and displaying.
(4) And collecting power detection voltage, converting and displaying.
(5) And detecting whether the control key is pressed or not, and responding.
The basic working flow of the single chip microcomputer is shown in fig. 4.
The swing rod antenna in the same swing rod link receives multiple paths of microwave signals, the microwave signals enter the microwave combiner to be combined for combining, the output signals of the combiner are sent into the first microwave assembly to be conditioned, the output signals are modulated by the first optical transmitter, the microwave signals are converted into optical signals, the optical signals enter the swing rod mode optical cable to be remotely transmitted
The output end of the first optical transmitter is connected to the link switching device through a swing link mode optical cable.
In an embodiment of the invention, the second microwave assembly comprises a microwave circuit and a monitoring circuit.
The microwave circuit comprises a filter, a step attenuator, an amplifier and a power divider which are connected in sequence.
The monitoring circuit comprises a current detection circuit and a power detection circuit.
Arrow remote signals received by the omnidirectional antenna are processed by a filter, a step attenuator and an amplifier to obtain omnidirectional output microwave signals, the omnidirectional output microwave signals are divided into 2 paths by a power divider, one path is used as output signals of the second microwave component, and the other path is input to a power detection circuit.
The current detection circuit is an AD8211 chip and is used for detecting the current of the microwave circuit.
The power detection circuit detects the power of the output microwave signal and monitors the output power of the second microwave component.
And the output signal of the second microwave component is transmitted and output through a second optical transmitter.
The output of the second optical transmitter is connected to the link switching device via an omni-directional mode optical cable.
In the embodiment of the invention, the link switching device is an optical switch.
In the embodiment of the invention, the microwave combiner is an independent functional unit and completes the combined output of microwave signals. The input signal is RF signal output by 3 microwave modules, and the output is 1, which is sent to the RF inlet of the optical transmitter.
The basic structure of the microwave combiner is shown in fig. 5.
The total attenuation of each channel of the 2 combiners is less than 8dB, the standing wave is less than 1.5, and the flatness in the band is better than 2 dB.
The microwave combiner assembly adopts a plug-in structure and is 3U in height and 8TE in width.
The front panel of the microwave combiner assembly needs to be installed with 4 SMA sockets, of which 3 are used for RF input and 1 is used for RF combining output, and the structure is shown in fig. 6.
In the embodiment of the invention, the optical transmitter adopts a Distributed Feedback (DFB) laser transmitting module. Distributed Feedback (DFB) laser transmitters are capable of transmitting RF signals from 300MHz to 10 GHz. The light emitting circuit basically comprises a laser source, an optical modulator bias circuit, a control circuit and the like.
The optical transmitter performance index is shown in table 1.
TABLE 1 DFB laser transmitter optical/electrical performance index table
The optical transmitter typically compresses by a point of 7dBm by 1 dB.
Optical switches use the latest silicon micro-electromechanical system (MEMS) micromirror technology to realize optical path switching, the main properties of which are shown in table 2. The electrical schematic of the optical switch is shown in fig. 7.
Table 2 optical/electrical performance index table for optical switch
In the embodiment of the invention, the antennas all adopt S-band antennas to work in S-band, and the technical indexes are shown in Table 3.
TABLE 3 microwave antenna Performance index
Considering that the environment is complex and the laying is difficult, a soft cable is selected. And the highest working frequency is 3GHz, so the cable wire diameter can be smaller, and the cable is more portable.
Through investigation, the braided belt shielding layer cable is selected, the medium adopts a foaming structure, and the low-loss characteristic can still be obtained. The basic dimensions and characteristics are shown in tables 4 and 5.
TABLE 4 Soft Low loss Cable Primary characteristics
TABLE 5 Soft Low loss Cable loss characteristics
The cable joint is an N-type connector and is a soft radio frequency coaxial connector with characteristic impedance of 50 omega. The applicable frequency range is 0-6 GHz, and the flexible cable coaxial cable connector is used for flexible cable coaxial cable connectors with medium and small power. The connector is the most widely applied connector in indoor distribution, has good mechanical property and can be matched with most feeder lines for use. The main properties are shown in table 6.
TABLE 6 Main technical characteristics of N-type connector
The cable assembly specifications are shown in table 7.
TABLE 7 Cable Assembly characteristics
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A launch arrow remote signal optical fiber relay remote transmission system is characterized by comprising a swing rod antenna, a swing rod link, an omnidirectional antenna link, a 1.8m antenna receiving link and a link switching device;
the swing link comprises a left-handed swing link and a right-handed swing link;
arrow remote signals captured by the swing rod antenna comprise a plurality of paths of arrow remote signals in a left-handed polarization form and a plurality of paths of arrow remote signals in a right-handed polarization form, wherein the plurality of paths of arrow remote signals in the left-handed polarization form are accessed into the left-handed swing rod link, and the plurality of paths of arrow remote signals in the right-handed polarization form are accessed into the right-handed swing rod link;
the swing rod link consists of a microwave combiner, a first microwave assembly and a first optical transmitter; the output end of the microwave combiner is connected to the input end of the first microwave assembly, and the output end of the first microwave assembly is connected to the first optical transmitter;
the omnidirectional antenna link comprises a left-handed omnidirectional antenna link and a right-handed omnidirectional antenna link;
arrow remote signals captured by the omnidirectional antenna comprise arrow remote signals in a left-handed polarization form and arrow remote signals in a right-handed polarization form, and are correspondingly connected to the left-handed omnidirectional antenna link and the right-handed omnidirectional antenna link respectively;
the omnidirectional antenna link consists of a second microwave component and a second optical transmitter which are connected in sequence;
the 1.8m antenna receiving link comprises an optical receiver, a microwave switch, a remote measuring receiver and a 1.8m wire; wherein the optical receiver, the telemetering receiver and the 1.8m wire are all connected to the microwave switch;
the swing link, the omnidirectional antenna link and the 1.8m antenna receiving link are all connected to a link switching device, and the link switching device is used for switching and combining all links.
2. The system of claim 1, wherein the first microwave assembly comprises a microwave circuit and a monitoring circuit;
the microwave circuit comprises a filter, a step attenuator, an amplifier and a power divider which are connected in sequence;
the monitoring circuit comprises a current detection circuit and a power detection circuit;
arrow remote signals received by the swing rod antenna are processed by a filter, a step attenuator and an amplifier to obtain swing rod output microwave signals, the swing rod output microwave signals are divided into 2 paths by the power divider, one path is used as output signals of the first microwave component, and the other path is input to the power detection circuit;
the current detection circuit is an AD8211 chip and is used for detecting the current of the microwave circuit;
the power detection circuit is used for carrying out power detection on the output microwave signal and monitoring the output power of the first microwave component;
multipath microwave signals received by oscillating bar antennas in the same oscillating bar link enter the microwave combiner, output signals are sent to the first microwave assembly, and finally optical signals suitable for optical cables to carry out remote transmission are formed after the signals are processed by a first optical transmitter;
the output end of the first optical transmitter is connected to the link switching device through a swing rod optical cable.
3. The system of claim 1, wherein the second microwave assembly comprises a microwave circuit and a monitoring circuit;
the microwave circuit comprises a filter, a step attenuator, an amplifier and a power divider which are connected in sequence;
the monitoring circuit comprises a current detection circuit and a power detection circuit;
arrow remote signals received by the omnidirectional antenna are processed by a filter, a step attenuator and an amplifier to obtain omnidirectional output microwave signals, the omnidirectional output microwave signals are divided into 2 paths by the power divider, one path is used as output signals of the second microwave component, and the other path is input to the power detection circuit;
the current detection circuit chip is AD8211 and is used for detecting the current of the microwave circuit;
the power detection circuit is used for carrying out power detection on the output microwave signal and monitoring the output power of the second microwave component;
the microwave output signal of the second microwave component is converted into an optical signal through the second optical transmitter;
the output of the second optical transmitter is connected to the link switching device via an omni-directional mode optical cable.
4. The system of claim 1, wherein the link switching device is an optical switch.
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