| Citation: | WANG Yuxin, ZHONG Shan, LIANG Wei, ZHAO Feng, ZHAN Zhiming, YAN Baiyi, KANG Songbai. Enhanced method for thermal frequency tuning of an self-injection locked laser[J]. Chinese Optics. doi: 10.37188/CO.2024-0025
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In order to enhance the continuous tunable range of a self-injection-locked laser frequency, a study is conducted on the variation relationship of the injected locking phase of the FP microcavity during the frequency-thermal tuning process.
Building upon traditional frequency thermotuning methods, this study explores the characteristics of frequency and phase parameters of a self-injection locked laser. We proposed an improved algorithm that integrates injection locking phase compensation and DFB chip current compensation during frequency thermotuning. Experimental validation of this algorithm was conducted on a Fabry-Perot (FP) micro-cavity self-injection locked laser. The laser operates at a wavelength of 1550nm with a 3dB linewidth of 785Hz, achieving frequency thermotuning of the FP micro-cavity using a pair of heating resistors.
The enhanced algorithm is implemented within the microcontroller program of the laser's original drive control circuit. No modifications are made to the hardware components of the laser. Ultimately, this implementation achieves a continuous frequency tuning range of 6 GHz.
This work provides a simple, efficient, and stable frequency tuning solution for self-injection-locked lasers, demonstrating high practicality and promising market prospects.
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