Photoelectric hybrid phase-locked loop

Abstract

The invention discloses a photoelectric hybrid phase-locked loop. The photoelectric hybrid phase-locked loop comprises a signal light source, a local oscillation laser source, an oscillation signal source, a 2*490DEG free space optical bridge, a first balance detector, a second balance detector, a first frequency mixer, a second frequency mixer, a third frequency mixer, a first adder, a second adder, a power detector, a band-pass filter, a low-pass filter, a voltage-controlled oscillator, a first phase shifter, a second phase shifter and a signal receiver. The light and the electricity are separated, the light and the light are mixed, and the electricity and the electricity are mixed; in the electric field, an oscillation signal is imported to perform the phase-locking; the requirement onthe local oscillation laser source is reduced to realize the fast locking, and the influence by the crosstalking between a data channel and a phase-locked channel is avoided, the transmission of the residual carrier is unnecessary. The photoelectric hybrid phase-locked loop has important significance for the future free space coherent light communication.

Description

technical field [0001] The invention relates to free-space coherent optical communication, in particular to a photoelectric hybrid oscillation phase-locked loop, which is used in a ground receiving device in a satellite-to-earth laser communication link to demodulate received signals and output data signals. Background technique [0002] Free-space coherent optical communication technology has attracted widespread attention due to its advantages of high receiving sensitivity, but its system has complex problems, especially high requirements for local oscillator lasers and low bit error rates, so we developed a photoelectric hybrid oscillator lock The study of phase rings. This will be of great significance to free-space coherent optical communication. [0003] Existing technology [1] (Sun Jianfeng, Zhang Bo, Zhang Ning, etc., "Photoelectric hybrid detection device based on 2×4 90° optical bridge", Chinese invention patent (application number: CN201610058350.2, publication n...

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Problems solved by technology

[0003] Existing technology [1] (Sun Jianfeng, Zhang Bo, Zhang Ning, etc., "Photoelectric hybrid detection device based on 2×4 90° optical bridge", Chinese invention patent (application number: CN201610058350.2, publication number: CN105721061A )) The use of light and light mixing, electricity and electricity mixing greatly reduces the requirements for local oscillator lasers, but will be affected by the crosstalk between the data channel and the phase-locked channel

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