Spatial coherent optical communication frequency tracking system and frequency shift tracking compensation method

Abstract

The invention discloses a spatial coherent optical communication frequency tracking system and a frequency shift tracking compensation method, and relates to the field of spatial optical communication, and the system comprises: a local oscillator laser which is used for outputting local oscillator light for frequency mixing; a digital signal processing module which is used for calculating the frequency difference between the carrier frequency of the received optical signal and the optical frequency of the local oscillation light; and a control module which is used for receiving the frequency difference calculated by the digital signal processing module. The digital signal processing module is configured to directly demodulate the received optical signal when the frequency difference does not exceed a demodulatable threshold value. When the frequency difference exceeds the demodulatable threshold but does not exceed the compensation range, demodulating the received optical signal after compensation; and when the frequency difference exceeds the demodulatable threshold value and exceeds the compensation range, feeding back the frequency difference to the control module, and driving the local oscillator laser to adjust the light frequency of the local oscillator light through the control module. According to the invention, the received optical signal can be correctly demodulated, so that the tracking compensation problem of Doppler frequency shift is solved.

Description

technical field [0001] The invention relates to the field of space optical communication, in particular to a space coherent optical communication frequency tracking system and a frequency shift tracking compensation method. Background technique [0002] At present, with the sharp increase in space exploration and communication requirements, the research on space optical communication technology is also developing continuously. Due to the development and research of optical fiber communication technology for many years, the technology has become mature, so some technologies can be migrated to the field of space optical communication, which also uses laser to carry information. [0003] Coherent optical communication has the advantages of fast transmission rate, large transmission capacity and long transmission distance, and is the preferred solution for space optical communication. In the receiver of coherent optical communication, the received optical signal and the local o...

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Problems solved by technology

[0004] Aiming at the defects existing in the prior art, the first aspect of the present invention provides a spatially coherent optical communication frequency tracking system that can ensure that the received optical signal is correctly demodulated to solve the tracking compensation problem of Doppler frequency shift

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