Optical fiber amplifier and ATP control system

Abstract

The application provides an ultra-low light high-speed reporting optical fiber amplifier and ATP control system for satellite optical communication. The provided erbium-doped optical fiber amplifier can report the change of input light at high speed, thereby replacing a high-precision detection CCD, and a control system is adjusted by high-speed reported light power to improve the coupling efficiency. The whole alignment optical system can reduce a beam splitter, thereby reducing the optical path loss, improving the in-fiber light power, and improving the sensitivity.

Description

Technical Field

[0001] This invention relates to the field of optical communication, and more specifically, to an optical fiber amplifier and an ATP control system. Background Technology

[0002] Satellite communication technology, including satellite optical communication technology, involves interdisciplinary research across multiple fields. It is highly complex and challenging, encompassing areas such as optics, mechanics, signal processing, mathematics, and computer science. The entire satellite communication system, for example... Figure 1 ,like Figure 1 As shown, the entire satellite communication system includes a modulator, a transmitter, a first optical amplifier, an optical transmitting antenna, an optical receiving antenna, a second optical amplifier, a receiver, a modulator, and an ATP control system connected to the optical transmitting antenna and the optical receiving antenna respectively.

[0003] High-precision acquisition, tracking, and pointing (ATP) technology is a key and challenging aspect of this technology. Currently, ATP technology employs methods such as... Figure 2 As shown, ATP uses spectral splitting technology and a high-precision detection CCD camera to control the universal turntable to couple the light from the optical system into the optical fiber for optical amplification. The high-precision detection CCD camera is very expensive.

[0004] Currently, ATP technology employs beam splitting, which already introduces significant losses from the optical system coupling to the fiber. The need for beam splitting for alignment further increases optical path losses and reduces input power. Although a fiber amplifier is used, the low input light degrades the signal-to-noise ratio of the amplifier, reducing sensitivity and increasing bit errors. Ordinary photodetectors cannot directly detect ultra-low input light power. Summary of the Invention

[0005] This invention addresses the technical problems existing in the prior art by providing an optical fiber amplifier and an ATP control system.

[0006] According to a first aspect of the present invention, an optical fiber amplifier is provided, comprising a first optical fiber connector, a first optical fiber isolator, a first wavelength division multiplexer, a first erbium-doped fiber, a pump laser, a second wavelength division multiplexer, a second optical fiber isolator, an optical fiber filter, a first optical fiber splitter, a first photodetector, a third wavelength division multiplexer, a second erbium-doped fiber, a second optical fiber isolator, a second optical fiber splitter, a second optical fiber connector, and a second photodetector.

[0007] The input light enters the first optical fiber connector, the first optical fiber isolator and the optical fiber first wavelength division multiplexer in sequence, and the pump light generated by the pump light source enters the optical fiber first wavelength division multiplexer; the input light and the pump light enter the first erbium-doped optical fiber together, in the first erbium-doped optical fiber, the pump light is absorbed, and the input light is amplified; the amplified input light and the residual pump light after absorption enter the optical fiber second wavelength division multiplexer and are divided into two paths of light; the amplified light enters the second optical fiber isolator, the optical fiber filter and the first optical fiber splitter, a small part of light is divided by the first optical fiber splitter to enter the first photoelectric detector, the change of the detected input light is sampled by the circuit and the input light power is reported, and most of the light divided by the first optical fiber splitter enters the optical fiber third wavelength division multiplexer, and the residual pump light also enters the optical fiber third wavelength division multiplexer and enters the second erbium-doped optical fiber together, in the second erbium-doped optical fiber, the pump light is absorbed again, and the input light is amplified again; the light amplified again enters the second optical fiber isolator, the second optical fiber splitter and the second optical fiber connector and is output from the second optical fiber connector; a part of light is divided by the second optical fiber splitter to enter the second photoelectric detector, and the optical path control is realized by sampling through the circuit.

[0008] Based on the technical scheme, the application further has the following improvements.

[0009] Optionally, the application further comprises a first analog-to-digital converter (ADC), a second ADC and a third ADC, a control unit (MCU) and an RS422 communication interface.

[0010] The signal detected by the first photoelectric detector is sampled by the first ADC, enters the MCU, and the MCU reports the input light power at a high speed through the RS422 communication interface.

[0011] The signal generated by the second photoelectric detector is sampled by the second ADC, enters the MCU, and the MCU controls the pump laser through the third ADC to realize the output light power control of the pump laser.

[0012] According to the second aspect of the application, an ATP control system is provided, comprising a gimbal, an optical receiving antenna, a beam splitter, a coarse alignment sensor and an alignment control system connected in sequence, an output end of the alignment control system is connected to an input end of the gimbal, an output end of the gimbal is connected to an input end of the optical receiving antenna, an output end of the beam splitter is connected to the alignment control system through a fiber amplifier and a fine alignment sensor, the fiber amplifier amplifies the input light and reports the amplified input light power to the alignment control system, and the alignment control system controls the gimbal according to the input light power.

[0013] The application provides a kind of optical fiber amplifier and ATP control system, the design of erbium-doped fiber amplifier, can report the change of input light at high speed, to replace high-precision detection CCD, alignment control system is adjusted by the light power of high-speed reporting, to improve coupling efficiency.New design of erbium-doped fiber amplifier, can let whole alignment optical system, reduce beam splitter, to reduce the loss of optical path, improve the in-fiber light power, improve sensitivity. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structural schematic diagram of satellite communication system;

[0015] Figure 2 It is the structural schematic diagram of traditional ATP control system;

[0016] Figure 3 The application provides a kind of ATP control system's structural schematic diagram;

[0017] Figure 4 It is the structural schematic diagram of optical fiber amplifier provided by the application;

[0018] Figure 5 It is the structural schematic diagram of related hardware. DETAILED DESCRIPTION

[0019] To make the purpose, technical scheme and advantages of the embodiments of the application clearer, the technical scheme in the embodiments of the application will be described clearly and completely in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application. In addition, the technical features in each embodiment or single embodiment provided by the application can be combined with each other to form a feasible technical solution, and this combination is not restricted by the order of steps and / or structure mode, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and it is not within the scope of protection claimed by the application.

[0020] See Figure 2The existing traditional ATP control system mainly includes a universal turntable, an optical receiving antenna, a first beam splitter, a coarse alignment sensor, and an alignment control system connected in sequence. The output of the first beam splitter is connected to the alignment control system via a fine alignment mechanism, a second beam splitter, and a fine alignment sensor. The output of the second beam splitter is connected to an optical amplifier. Traditional ATP technology requires beam splitting for alignment coupling, which increases optical path loss and reduces input fiber power. Although there is an optical fiber amplifier, the low input light causes a deterioration in the signal-to-noise ratio of the optical fiber amplifier, thereby reducing sensitivity and increasing bit errors.

[0021] Figure 2 For the drawbacks of the traditional ATP control system, see [link to relevant documentation]. Figure 3 This invention provides a novel ATP control system, wherein, Figure 3 ATP technology will Figure 2 The fine alignment mechanism, the second beam splitter, the fine alignment sensor, and the second optical amplifier in the present invention can be replaced with an optical amplifier provided by the present invention. The optical fiber amplifier in the present invention is an erbium-doped optical fiber amplifier, wherein the erbium-doped optical fiber amplifier amplifies the input optical power and reports the input optical power.

[0022] in, Figure 3 The provided ATP control system includes a gimbal, an optical receiving antenna, a beam splitter, a coarse alignment sensor, and an alignment control system connected in sequence. The output of the alignment control system is connected to the input of the gimbal, and the output of the gimbal is connected to the input of the optical receiving antenna. The output of the beam splitter is connected to the alignment control system through an optical fiber amplifier and a fine alignment sensor. The optical fiber amplifier amplifies the input light and reports the amplified input light power to the alignment control system. The alignment control system controls the gimbal based on the input light power.

[0023] See Figure 4 The present invention provides an optical fiber amplifier for ultra-low light high-speed reporting satellite optical communication, characterized in that it includes a first optical fiber connector, a first optical fiber isolator, a first wavelength division multiplexer, a first erbium-doped fiber, a pump laser, a second wavelength division multiplexer, a second optical fiber isolator, an optical fiber filter, a first optical fiber splitter, a first photodetector, a third wavelength division multiplexer, a second erbium-doped fiber, a second optical fiber isolator, a second optical fiber splitter, a second optical fiber connector, and a second photodetector.

[0024] The working principle is that: the input light enters the first optical fiber connector, the first optical fiber isolator and the optical fiber first wavelength division multiplexer in turn, and the pump light generated by the pump light source enters the optical fiber first wavelength division multiplexer; the input light and the pump light enter the first erbium-doped optical fiber together, in the first erbium-doped optical fiber, the pump light is absorbed, and the input light is amplified; the amplified input light and the remaining pump light absorbed enter the optical fiber second wavelength division multiplexer and are divided into two paths of light; the amplified light enters the second optical fiber isolator, the optical fiber filter and the first optical fiber splitter, a small part of light is divided into the first photodetector by the first optical fiber splitter, the change of the detected input light is sampled by the circuit, the input light power is reported, and most of the light divided by the first optical fiber splitter enters the optical fiber third wavelength division multiplexer, and the remaining pump light also enters the optical fiber third wavelength division multiplexer, and enters the second erbium-doped optical fiber together, in the second erbium-doped optical fiber, the pump light is absorbed again, and the input light is amplified again; the light amplified again enters the second optical fiber isolator, the second optical fiber splitter and the second optical fiber connector, and is output from the second optical fiber connector; a part of light is divided into the second photodetector by the second optical fiber splitter, and the optical path control is realized by sampling through the circuit.

[0025] In the above embodiment, the description of each embodiment is different, and the part not described in detail in one embodiment can be referred to the related description of other embodiments. Figure 5 The hardware design of the erbium-doped optical fiber amplifier related to the photodetector includes a first analog-to-digital converter ADC, a second analog-to-digital converter ADC and a third analog-to-digital converter ADC, a control unit MCU and an RS422 communication interface.

[0026] The signal detected by the first photodetector is sampled by the first analog-to-digital converter ADC, enters the micro control unit MCU, and the micro control unit MCU reports the input light power at high speed through the RS422 communication interface; the signal generated by the second photodetector is sampled by the second analog-to-digital converter, enters the micro control unit MCU, and the micro control unit MCU controls the pump laser through the third analog-to-digital converter ADC sampling, so as to realize the output light power control of the pump laser. One of the photodetectors is responsible for reporting the input light power, and the other is responsible for controlling the output light power of the pump laser.

[0027] The erbium-doped optical fiber amplifier provided by the application completely replaces the high-precision detection camera CCD, reduces the cost of the ATP control system, improves the receiving sensitivity by reducing the loss on the optical path, and can report the ultra-low input light power at high speed by amplifying the ultra-low input light and then sampling the light.

[0028] It should be noted that in the above embodiment, the description of each embodiment is different, and the part not described in detail in one embodiment can be referred to the related description of other embodiments.

[0029] While the preferred embodiments of the application have been described, additional variations and modifications can be made to these embodiments by those skilled in the art once they have the benefit of the present disclosure without departing from the spirit and scope of the application. Accordingly, it is intended that the appended claims include all such modifications and variations as fall within the scope of the present application.

[0030] It is apparent that those skilled in the art can make various changes and modifications to the application without departing from the spirit and scope of the application. It is therefore intended that the present application cover all such changes and modifications that are within its scope.

Claims

1. An ultra-low light high-speed reporting satellite optical communication optical fiber amplifier, characterized by, The first optical fiber connector, the first optical fiber isolator, the first wavelength division multiplexer, the first erbium-doped optical fiber, the pump laser, the second wavelength division multiplexer, the second optical fiber isolator, the optical fiber filter, the first optical fiber splitter, the first photodetector, the third wavelength division multiplexer, the second erbium-doped optical fiber, the second optical fiber isolator, the second optical fiber splitter, the second optical fiber connector and the second photodetector are included. The input light enters the first optical fiber connector, the first optical fiber isolator and the optical fiber first wavelength division multiplexer in sequence, and the pump light generated by the pump light source enters the optical fiber first wavelength division multiplexer; the input light and the pump light enter the first erbium-doped optical fiber together, in which the pump light is absorbed and the input light is amplified; the amplified input light and the remaining pump light are divided into two paths in the optical fiber second wavelength division multiplexer; the amplified light enters the second optical fiber isolator, the optical fiber filter and the first optical fiber splitter, a small part of the light is divided into the first photodetector by the first optical fiber splitter, the first photodetector samples the change of the detected input light through the circuit and reports the input light power, and most of the light is divided into the optical fiber third wavelength division multiplexer by the first optical fiber splitter, and the remaining pump light also enters the optical fiber third wavelength division multiplexer and enters the second erbium-doped optical fiber together, in which the pump light is absorbed again and the input light is amplified again; the amplified light enters the third optical fiber isolator, the second optical fiber splitter and the second optical fiber connector and is output from the second optical fiber connector; the second optical fiber splitter divides a part of the light into the second photodetector, samples the light through the circuit and realizes the optical path control; the first analog-to-digital converter (ADC), the second analog-to-digital converter (ADC) and the third analog-to-digital converter (ADC), the control unit (MCU) and the RS422 communication interface are further included; the signal detected by the first photodetector is sampled by the first analog-to-digital converter (ADC), enters the micro control unit (MCU) and is reported to the input light power by the micro control unit (MCU) through the RS422 communication interface; the signal generated by the second photodetector is sampled by the third analog-to-digital converter (ADC), enters the micro control unit (MCU) and is controlled by the micro control unit (MCU) through the second analog-to-digital converter (ADC) to realize the output light power control of the pump laser.

2. An ATP control system characterized by, The universal turntable, the optical receiving antenna, the beam splitter, the coarse alignment sensor and the alignment control system are connected in sequence, the output end of the alignment control system is connected with the input end of the universal turntable, the output end of the universal turntable is connected with the input end of the optical receiving antenna, the output end of the beam splitter is connected with the alignment control system through the optical fiber amplifier and the fine alignment sensor, the input light is amplified by the optical fiber amplifier and the amplified input light power is reported to the alignment control system, and the alignment control system controls the universal turntable according to the input light power.

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