Pre-compensation feedback control system and method for frequency difference locking of fiber laser

Abstract

The invention discloses a pre-compensation feedback control system and method for frequency difference locking of an optical fiber laser, and the system is characterized in that the system comprises a reference light source part, a controllable single-frequency optical fiber laser part, a frequency difference signal detection part, and a pre-compensation feedback control part. According to the system, the frequency change of the frequency difference signal at the next moment is predicted by using the long-short-term memory network, and then the frequency difference signal is pre-compensated; the acousto-optic modulator is adopted to realize fast loop feedback control and improve the locking precision; and the piezoelectric ceramics are utilized to realize slow loop feedback control and expand the locking bandwidth range.

Description

technical field [0001] The invention belongs to the technical field of laser applications, in particular to a pre-compensation feedback control system for frequency difference locking of fiber lasers. Background technique [0002] In recent years, with the further development of coherent optical communication, coherent detection, coherent combination and other technologies, new requirements have been put forward for laser frequency difference locking. At present, the frequency difference locking technology based on the traditional analog phase-locked loop is limited by the acquisition bandwidth and tracking bandwidth of the phase-locked loop, which cannot achieve long-term stable operation, and the locking accuracy is not high. The root mean square error of the general locking result is about 400KHz. [0003] The traditional frequency difference locking technology based on the analog phase-locked loop requires that the feedback devices are all analog control devices, and its...

AI Technical Summary

Problems solved by technology

At present, the frequency difference locking technology based on the traditional analog phase-locked loop is limited by the capture bandwidth and tracking bandwidth of the phase-locked loop, which cannot achieve long-term stable operation, and the locking accuracy is not high. The root mean square error of the general locking result is about 400KHz

[0003] The traditional frequency difference locking technology based on analog phase-locked loop requires that the feedback devices are all analog control devices, and its control accuracy is limited by the accuracy of analog signals

At the same time, conventional feedback devices used in fiber lasers are generally piezoelectric ceramics. This device is limited by its own creep effect and hysteresis effect, which will bring nonlinear regulation and affect the locking accuracy.

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