TITLE:
Frequency Sweep Linearization for Semiconductor Laser Using a Feedback Loop Based on Amplitude-Frequency Response
AUTHORS:
Jianfang Zhu, Ligong Chen
KEYWORDS:
Frequency Sweep Linearization, Frequency-Modulated-Continuous-Wave, Feedback, Semiconductor Laser
JOURNAL NAME:
Optics and Photonics Journal,
Vol.11 No.8,
August
3,
2021
ABSTRACT: A scheme of frequency sweep linearization of semiconductor lasers using a feed-back loop based on amplitude-frequency response is demonstrated in this paper. The beat frequency signal is obtained by self-heterodyne detection. The frequency changes are converted to the envelope of beat frequency signal after amplitude-frequency response. The active frequency sweep linearization is realized by feeding envelope deviations back to the drive currents of the lasers by a feedback loop. A simulation model is built to verify this scheme by Simulink. This scheme does not need high-performance, expensive lasers, complex linearization or tedious post-processing processes, which are of great significance for related applications.