Inter-satellite coherent light communication system based on composite axis phase locking

A technology of coherent optical communication and compound axis, applied in the field of satellite optical communication, can solve problems such as increasing system complexity

Active Publication Date: 2020-07-07
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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This dual frequency-locked loop inc

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  • Inter-satellite coherent light communication system based on composite axis phase locking
  • Inter-satellite coherent light communication system based on composite axis phase locking
  • Inter-satellite coherent light communication system based on composite axis phase locking

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[0024] The present invention will be further described below in conjunction with examples of implementation and accompanying drawings, but the protection scope of the present invention should not be limited by this. Please refer to the schematic diagram, which is a schematic diagram of a satellite optical communication system device based on composite axis phase-locking according to the present invention. The solid line part is the connection of electrical signals, and the dotted line part is the connection of optical signals. It can be seen from the figure that a satellite optical communication system device based on composite axis phase-locking includes a signal generator, a first laser, a phase modulator, a first driver, an adjustable optical attenuator, a first beam splitter, an optical power meter, Optical Amplifier, Optical Bridge, First Detector, Second Detector, Limiting Amplifier, Bit Error Tester, Third Detector, Fourth Detector, ADC, First FPGA, Direct Digital Synthe...

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Abstract

The invention discloses an inter-satellite coherent light communication system based on composite axis phase locking, which can be applied to an inter-satellite light communication system with large-range and high-speed change of signal light frequency, and achieves real-time tracking of a local oscillator light phase to a received signal light phase by using a mode of combining laser temperaturetuning and external tuning. According to the inter-satellite coherent light communication system, a receiving end takes a field programmable gate array (FPGA) as a digital signal processor to realizethe extraction of a phase error signal, signal light and a local oscillation light frequency difference signal, and a local oscillator light temperature tuning port is driven to realize frequency unloading according to the signal light and the local oscillation light frequency difference signal. The inter-satellite coherent light communication system has the advantages that the features of wide range and low bandwidth of temperature tuning are combined with the features of narrow range and high bandwidth of external tuning; in the initial phase locking stage, rapid loop entry is achieved through temperature scanning, and after phase locking, the system can be guaranteed to keep stable operation of a loop in large-range frequency drift caused by the Doppler effect through real-time unloading of the frequency of temperature tuning; and the inter-satellite coherent light communication system can realize inter-satellite high-sensitivity homodyne coherent light communication.

Description

technical field [0001] The invention belongs to the field of satellite optical communication of homodyne coherent detection. The system device combines the characteristics of large range and low bandwidth of temperature tuning and narrow range and high bandwidth of external tuning. Real-time compensation for inter-satellite Doppler effect can be realized, and stable operation of optical phase-locked loop can be realized. The under-sampling method is used to extract the phase error signal, which reduces the requirement on the bandwidth of the back-end electronic device. Background technique [0002] With the improvement of the communication rate requirements of communication satellites, the traditional intensity modulation direct detection communication system can no longer meet the requirements. The coherent optical communication system can meet the requirements of communication satellites for communication speed and communication sensitivity. For homodyne coherent optical...

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Application Information

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IPC IPC(8): H04B10/63H04B10/50H04B10/548H04B10/54H04B10/118
CPCH04B10/63H04B10/503H04B10/548H04B10/54H04B10/118
Inventor 鲁绍文侯霞孙建锋朱小磊陈卫标朱福南栗永超
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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