Improved method for frequency-thermal tuning of a self-injection locked laser
In order to expand the continuous tunable range of a self-injection-locked laser frequency,the vari-ation relationship of the injected locking phase of the Fabry-Perot(FP)microcavity during the frequency-thermal tuning process is studied.Based on the traditional frequency-thermal tuning methods,we explore the frequency and phase parameter characteristics of a self-injection locked laser.We propose an improved al-gorithm which adds self-injection locking phase compensation and DFB chip current compensation during frequency-thermal tuning methods.Experimental validation of this algorithm is conducted on a FP micro-cavity self-injection locked laser.The laser operates at a wavelength of 1 550 nm with a 3 dB linewidth of 785 Hz,achieving frequency-thermal tuning methods of the FP micro-cavity using a pair of heating resistors.The improved algorithm is implemented within the microcontroller program of the laser's original drive con-trol circuit.No modifications are made to the hardware components of the laser.Ultimately,a continuous fre-quency tuning range of 6 GHz is realized.This work provides a simple,efficient,and stable frequency-tun-ing solution for self-injection-locked lasers,demonstrating high practicality and promising market prospects.
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