An Optical Phase-Locked Loop with Enlarged Loop Synchronization Belt

Abstract

An optical phase-locked loop with an enlarged loop synchronous belt, including a solid-state signal laser, a fiber coupler, a balance detector, a loop filter, a voltage conversion module, a voltage measurement control module, a piezoelectric driver, and a solid-state local oscillator laser; the ring The first frequency control signal Vc1 output by the circuit filter is respectively input to an input port of the piezoelectric driver and the voltage conversion module. After the Vc1 of the input voltage conversion module is linearly transformed, it is input to the voltage measurement control module to obtain the second frequency control signal Vc2. The second frequency control signal Vc2 is input to another input port of the piezoelectric driver. The present invention changes Vc2 according to the size of Vc1. When Vc1 is close to the upper limit, increase Vc2 to reduce the value of Vc1; when Vc1 is close to the lower limit, reduce Vc2 to increase the value of Vc1, so that the loop filter output voltage Vc1 is normal Within the working range, while ensuring the stability of the loop, the synchronous belt of the loop is enlarged.

Description

technical field [0001] The invention relates to an optical phase-locked loop in the field of optoelectronic technology, in particular to an optical phase-locked loop with an enlarged loop synchronous belt. Background technique [0002] The optical phase-locked loop realizes the phase locking of two or more laser beams by controlling the optical path length of the laser resonator, and has important applications in homodyne spatial coherent optical communication systems, laser coherent detection systems and laser coherent combining systems. Optical phase-locked loops are mainly composed of local oscillator lasers, optical mixers, and loop filters. Among them, high-performance frequency-stabilized and tunable light sources are key components in optical phase-locked loops. Early optical phase-locked loops were mainly based on gas lasers, but the limitations of life, volume, and efficiency of gas lasers made it difficult to meet the needs of practical applications. With the deve...

AI Technical Summary

Problems solved by technology

Due to the wide range of laser frequency changes, to maintain loop locking, it is necessary to expand the timing belt of the loop (the timing belt is the maximum natural frequency difference that can maintain loop locking). The usual method for expanding the loop timing belt is to increase Loop gain, however, if the gain exceeds a certain range, the loop will self-oscillate and cannot work stably

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