CN114499678A - Multichannel balanced aerospace light preamplifier for random large input power range - Google Patents
Multichannel balanced aerospace light preamplifier for random large input power range Download PDFInfo
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- CN114499678A CN114499678A CN202210116020.XA CN202210116020A CN114499678A CN 114499678 A CN114499678 A CN 114499678A CN 202210116020 A CN202210116020 A CN 202210116020A CN 114499678 A CN114499678 A CN 114499678A
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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
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
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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
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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
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
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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
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
- H04B10/2942—Signal power control in a multiwavelength system, e.g. gain equalisation using automatic gain control [AGC]
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
Abstract
A multichannel balanced aerospace light preamplifier oriented to a random large input power range relates to the technical field of wireless high-speed laser communication, and aims to solve the problem that multichannel signals are difficult to balance and amplify within the random large input power range under the condition of dynamic rotation between an existing aerospace platform cabin and a load cabin, and the multichannel balanced aerospace light preamplifier comprises the following components: the device comprises an electric control optical attenuator, a first optical coupler, a first photoelectric detector, a first controller, a first isolator, a first wavelength division multiplexer, a first 980nm pump source, a first erbium-doped optical fiber, a first metal protection box, a matched filter, a second erbium-doped optical fiber, a second wavelength division multiplexer, a second 980nm pump source, a second controller, a second metal protection box, a second isolator, a second optical coupler and a second photoelectric detector; the invention completes the self-adaptive control of the input light power based on the electric control optical attenuator, the optical fiber coupler, the photoelectric detector and the controller, and can face the large-range random input power. A filter with the filter shape matched with the output of the laser is developed by testing the emission wavelength and the power of the multi-path laser.
Description
Technical Field
The invention relates to the technical field of wireless high-speed laser communication, in particular to an optical preamplifier in a wireless optical communication system for a space platform cabin and a load cabin.
Background
In recent years, high spatial and temporal resolution space cameras for space-based and ground-based targets have become a hot spot for research in the field of modern optical observation. Due to the reasons of high spectrum, high spatial resolution and the like of loads such as the existing space camera and the like, a large number of high-pixel images or high-definition videos are generated in unit time of the loads, so that the load cabin has urgent need of real-time transmission of mass data (hundreds of gigabits per second or even higher), and the bandwidth of the wireless microwave communication between the cabins cannot meet the communication requirement of the ultrahigh speed at present. Optical communication is a preferred choice because of its advantages such as high communication rate, small size, and light weight. However, the platform cabin and the load cabin are in a random rotation alignment state, so that the use of optical fiber communication is greatly limited, and the wireless optical communication takes free space as a channel, so that if the optical axis cannot be aligned in real time, the power jitter range of a receiving end is random and is large (more than or equal to 10 dB). Therefore, an optical preamplifier oriented to a random large input power range is needed, and in addition, the optical preamplifier needs to meet the requirement of simultaneous amplification of multiple channels and has space environment testability.
Chinese patent publication No. CN2566542Y entitled wavelength division multiplexing optical communication transmission device with optical amplification and automatic gain modulation, which includes an optical combiner, a wave splitter, and an optical amplifier, wherein the optical amplifier adopts an adjustable gain optical amplifier. The adjustable gain optical amplifier comprises an optical preamplifier and an optical power amplifier, and an electrically controlled variable optical attenuator is inserted between the optical preamplifier and the optical power amplifier. It can also be composed of an optical amplifier and an optical attenuator, the optical amplifier is divided into two halves from the erbium doped fiber, and a variable optical attenuator is arranged in the middle. The disclosed device cannot adapt to the aerospace environment, and meanwhile, the device cannot realize multichannel balanced low-noise amplification under the condition of random large input power range, and the application range is limited.
Disclosure of Invention
The invention provides a multi-channel balanced aerospace light preamplifier, which aims to solve the problem that multi-channel signals are difficult to balance and amplify in a low noise mode under the condition of random large input power range between an existing aerospace platform cabin and a load cabin.
The multichannel balanced aerospace light preamplifier oriented to the random large input power range is characterized by comprising the following components in percentage by weight: the device comprises an electric control optical attenuator, a first optical coupler, a first photoelectric detector, a first controller, a first isolator, a first wavelength division multiplexer, a first 980nm pump source, a first erbium-doped optical fiber, a first metal protection box, a matched filter, a second erbium-doped optical fiber, a second wavelength division multiplexer, a second 980nm pump source, a second controller, a second metal protection box, a second isolator, a second optical coupler and a second photoelectric detector;
the optical input end of the electric control optical attenuator is an amplifier input port, and the optical output end of the electric control optical attenuator is connected with the input end of the first optical coupler through an optical fiber; the electrical input end of the electrically controlled optical attenuator is connected with the output end of the first controller through a cable; 1% of ports of the output end of the first optical coupler are connected with an input end optical fiber of the photoelectric detector, and 99% of ports of the output end of the first optical coupler are connected with an input end optical fiber of the isolator; one output end of the photoelectric detector is connected with one cable of the controller;
the isolator I is connected with a 1550nm port optical fiber of the wavelength division multiplexer I, and a 980nm port of the wavelength division multiplexer I is connected with a 980nm pump source optical fiber; the dual-wavelength shared port of the wavelength division multiplexer I is sequentially connected with the ports 1550nm of the erbium-doped optical fiber I, the matched filter, the erbium-doped optical fiber II and the wavelength division multiplexer II through optical fibers; the 980nm port of the wavelength division multiplexer II is connected with the 980nm pumping source II optical fiber; the output end of the second isolator is connected with the input end of the second optical coupler through an optical fiber; the 1% port of the output end of the second optical coupler is connected with the second optical fiber of the photoelectric detector, and the 99% port of the output end of the second optical coupler is used as the output port of the amplifier; the output end of the second photoelectric detector is connected with a second controller, and the second controller is connected with a first 980nm pumping source and a second 980nm pumping source through cables;
the first metal protection box and the second metal protection box respectively wrap the first erbium-doped optical fiber and the second erbium-doped optical fiber to prevent irradiation from influencing the gain coefficient and the noise coefficient of the optical fibers.
The invention has the beneficial effects that:
1) adaptive control for large-range random input power: the invention completes the self-adaptive control of the input light power based on the electric control optical attenuator, the optical fiber coupler, the photoelectric detector and the controller, and can face the large-range random input power.
2) Aerospace radiation resistance: and the aerospace anti-radiation optical fiber is adopted, and meanwhile, a metal protection box is added on the outside, so that the damage of high-energy particles can be effectively resisted.
3) Matched filter: in order to ensure the balance and flatness of multiple channels, a filter with a filtering shape matched with the output of the laser is developed by testing the emission wavelength and the power of a multi-channel laser.
Drawings
FIG. 1 is a schematic structural diagram of a multichannel balanced aerospace light preamplifier oriented to a random large input power range according to the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention is directed to a multichannel balanced aerospace light preamplifier with a large random input power range, comprising: the optical fiber coupler comprises an electric control optical attenuator 1, an optical coupler I2, a photoelectric detector I3, a controller I4, an isolator I5, a wavelength division multiplexer I6, a 980nm pump source I7, an erbium-doped optical fiber I8, a metal protection box I9, a matched filter 10, an erbium-doped optical fiber II 11, a wavelength division multiplexer II 12, a 980nm pump source II 13, a controller II 14, a metal protection box II 15, an isolator II 16, an optical coupler II 17 and a photoelectric detector II 18.
The optical input end of the electric control optical attenuator 1 is an amplifier input port, and the optical output end of the electric control optical attenuator is connected with the input end optical fiber of the first optical coupler 2. And the electrical input end of the electric control optical attenuator 1 is connected with the output end of the first controller 4 through a cable. And 1% of ports of the output end of the optical coupler I2 are connected with the input end optical fiber of the photoelectric detector I3, and 99% of ports of the output end of the optical coupler I2 are connected with the input end optical fiber of the isolator I5. The output end of the first photoelectric detector 3 is connected with the first controller 4 through a cable.
The isolator one 5 is connected with the 1550nm port optical fiber of the wavelength division multiplexer one 6, and the 980nm port of the wavelength division multiplexer one 6 is connected with the 980nm pump source one 7 optical fiber. And a dual-wavelength common port of the wavelength division multiplexer I6 is sequentially connected with ports of the erbium-doped optical fiber I8, the matched filter 10, the erbium-doped optical fiber II 11 and the wavelength division multiplexer II 12 through optical fibers. The 980nm port of the wavelength division multiplexer II 12 is connected with the 980nm pump source II 13 optical fiber, and the double-wavelength shared port of the wavelength division multiplexer II 12 is connected with the output end optical fiber of the isolator II 16. The output end of the second isolator 16 is connected with the input end optical fiber in the second optical coupler 17. And 1% of the ports of the output ends in the second optical coupler 17 are connected with the second photodetector 18 through optical fibers, and 99% of the ports of the output ends in the second optical coupler 17 are used as output ports of the amplifier. The output end of the second photoelectric detector 18 is connected with a second controller 14, and the second controller 14 is connected with a first 980nm pump source 7 and a second 980nm pump source 13 through cables. The first metal protection box 9 and the second metal protection box 15 respectively wrap the first erbium-doped fiber 8 and the second erbium-doped fiber 11, so that the gain coefficient and the noise coefficient of the optical fibers are prevented from being influenced by irradiation. The electric control optical attenuator can change the amplitude of an optical signal through an electric signal control device.
The first metal protection box 9 and the second metal protection box 15 are radiation-resistant protection boxes, and the doped optical fibers are protected from being affected by high-energy particles through metal interlayers.
The first erbium-doped optical fiber 8 and the second erbium-doped optical fiber 11 are anti-irradiation erbium-doped optical fibers, so that the influence of high-energy ion radiation in a severe space environment on the optical device can be effectively reduced, and the safety and the service life of the space optical device are further ensured.
The matched filter 10 is a flat filter of a wide range of wavelengths (C band) for filtering a gain spectrum so that the flatness is ± 1 dB. In order to ensure the balance and flatness of multiple channels, a filter with a filtering shape matched with the output of the laser is developed by testing the emission wavelength and the power of a multi-channel laser.
The first controller 4 and the second controller 14 can control the optical attenuator and the pump source according to the feedback optical power.
The first photoelectric detector 3 and the second photoelectric detector 18 are high-sensitivity PIN tubes and receive and measure 1% feedback light power.
The first optical fiber coupler 2 and the second optical fiber coupler 17 are 1 x 2 optical couplers, the splitting ratio is 1:99, and 1% of light energy is used for feedback.
The invention relates to a working process of a multichannel balanced aerospace light preamplifier oriented to a random large input power range, which comprises the following steps:
as shown in fig. 1, the jittered weak optical signal enters an electrically controlled optical attenuator 1 for closed-loop control to ensure that the output optical power is relatively stable. The closed-loop control process is that the output optical signal of the electric control optical attenuator 1 is subjected to light splitting by 1% through the optical coupler I2 and then subjected to photoelectric conversion by the photoelectric detector I3, the power value of the output optical signal is calculated and analyzed through the controller I4 by the electric signal, if the power value of the optical signal does not reach the designed value, the controller I4 generates a control signal to control the attenuation value of the optical signal of the electric control optical attenuator 1, and the optical power is ensured to be relatively stable through multiple closed-loop control cycles.
The stabilized optical signal is output through the 99% port of the first optical coupler 2 via the first isolator 5, and the first isolator 5 is used for isolating the reverse gain spectrum of the amplifier and the pump light. The 980nm pump source I7 and the 980nm pump source II 13 pump the erbium-doped optical fiber I8 and the erbium-doped optical fiber II 11 through the wavelength division multiplexer I6 and the wavelength division multiplexer II 12 respectively to generate optical signal gains, and the gains are shaped through the matched filter 10 to obtain a filtered gain spectrum. And the weak optical signal output by the isolator I5 is amplified through optical signal gain to obtain an amplified optical signal. The optical signal passes through a second isolator 16 and a second optical coupler 17, the second isolator 16 is used for preventing the light returning from the back end, and the second optical coupler 17 is used for monitoring the value and stability of the output optical power. Wherein, a part of the amplified optical signal is output through the 99% port of the second optical coupler 17, and the other part of the amplified optical signal is output to the second photodetector 18 through the 1% port for detection. And calculating and analyzing the power value of the output optical signal by the second controller 14, and if the power value of the optical signal does not reach the designed value, generating a control signal by the second controller 14 to control the output pumping power of the first 980nm pumping source 7 and the second 980nm pumping source 13, so as to control the amplified optical signal value.
Claims (8)
1. The multichannel balanced aerospace light preamplifier oriented to the random large input power range is characterized by comprising the following components in percentage by weight: the optical fiber coupling device comprises an electric control optical attenuator (1), an optical coupler I (2), a photoelectric detector I (3), a controller I (4), an isolator I (5), a wavelength division multiplexer I (6), a 980nm pump source I (7), an erbium-doped optical fiber I (8), a metal protection box I (9), a matched filter (10), an erbium-doped optical fiber II (11), a wavelength division multiplexer II (12), a 980nm pump source II (13), a controller II (14), a metal protection box II (15), an isolator II (16), an optical coupler II (17) and a photoelectric detector II (18);
the optical input end of the electric control optical attenuator (1) is an amplifier input port, and the optical output end of the electric control optical attenuator is connected with the input end optical fiber of the first optical coupler (2); the electrical input end of the electric control optical attenuator (1) is connected with the output end of the first controller (4) through a cable; 1% of ports of the output end of the first optical coupler (2) are connected with optical fibers of the input end of the first photoelectric detector (3), and 99% of ports of the output end of the first optical coupler (2) are connected with optical fibers of the input end of the first isolator (5); the output end of the first photoelectric detector (3) is connected with the first controller (4) through a cable;
the isolator I (5) is connected with the 1550nm port optical fiber of the wavelength division multiplexer I (6), and the 980nm port of the wavelength division multiplexer I (6) is connected with the 980nm pump source I (7) optical fiber; the dual-wavelength common port of the wavelength division multiplexer I (6) is sequentially connected with the 1550nm port of the erbium-doped optical fiber I (8), the matched filter (10), the erbium-doped optical fiber II (11) and the wavelength division multiplexer II (12) through optical fibers; the 980nm port of the wavelength division multiplexer II (12) is connected with the 980nm pump source II (13) optical fiber, and the dual-wavelength shared port of the wavelength division multiplexer II (12) is connected with the output end optical fiber of the isolator II (16); the output end of the second isolator (16) is connected with the input end optical fiber in the second optical coupler (17); the 1% port of the output end in the second optical coupler (17) is connected with the optical fiber of the second photoelectric detector (18), and the 99% port of the output end in the second optical coupler (17) is used as an amplifier output port; the output end of the second photoelectric detector (18) is connected with a second controller (14), and the second controller (14) is connected with a first 980nm pump source (7) and a second 980nm pump source (13) through cables;
the first metal protection box (9) and the second metal protection box (15) respectively wrap the first erbium-doped optical fiber (8) and the second erbium-doped optical fiber (11) to prevent irradiation from influencing an optical fiber gain coefficient and a noise coefficient.
2. The multi-channel balanced aerospace light preamplifier oriented to a random large input power range according to claim 1, wherein the electrically controlled optical attenuator (1) changes the amplitude of the optical signal through an electrical signal control device.
3. The multi-channel balanced aerospace light preamplifier oriented to a random large input power range as claimed in claim 1, wherein the first (2) and second (17) fiber couplers are 1 x 2 optical couplers of one type, and the splitting ratio is 1:99, 1% of the light energy is used for feedback.
4. The multi-channel balanced aerospace photo-preamplifier oriented to a random large input power range as claimed in claim 1, wherein the photo-detectors one (3) and two (18) are high sensitivity PIN-also tubes, receiving a measurement of 1% feedback optical power.
5. The multi-channel balanced aerospace light preamplifier oriented to a random large input power range as claimed in claim 1, wherein the first controller (4) and the second controller (14) control the optical attenuator and the pump source according to feedback optical power.
6. The multichannel balanced aerospace light preamplifier for random large input power ranges according to claim 1, wherein the erbium-doped fibers I (8) and II (11) are radiation-resistant erbium-doped fibers, so that the influence of high-energy ion radiation in a severe space environment on the optical devices is effectively reduced, and the safety and the service life of the space optical devices are further ensured.
7. The multi-channel balanced aerospace light preamplifier for random large input power range according to claim 1, wherein the first metal protection box (9) and the second metal protection box (15) are radiation-resistant protection boxes, and the doped optical fiber is protected from high-energy particle influence by a metal interlayer.
8. The multichannel balanced aerospace light preamplifier for random large input power range oriented according to claim 1, wherein the matched filter (10) is a wide range wavelength C-band flattening filter for filtering gain spectrum, making flatness ± 1dB, ensuring multichannel balanced flatness, and developing a filter with matched filter shape and laser output by testing emission wavelength and power of multichannel laser.
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