High-quality frequency-modulated continuous-wave generation based on a semiconductor laser subject to cascade-modulated optical injection

Frequency-modulated continuous-wave (FMCW) can be acquired by using a distributed feedback semiconductor laser (DFB-SL) operating at period-one (P1) oscillation under an optical injection modulated by a Mach–Zehnder modulator (MZM). In this work, through introducing another MZM to establish cascade-...

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Published inOptics express Vol. 29; no. 16; p. 26265
Main Authors Jin, YanHong, Lin, XiaoDong, Wu, ZhengMao, Jiang, ZaiFu, Yue, DianZou, Yang, WenYan, Fan, Li, Xia, GuangQiong
Format Journal Article
LanguageEnglish
Published 02.08.2021
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Summary:Frequency-modulated continuous-wave (FMCW) can be acquired by using a distributed feedback semiconductor laser (DFB-SL) operating at period-one (P1) oscillation under an optical injection modulated by a Mach–Zehnder modulator (MZM). In this work, through introducing another MZM to establish cascade-modulated optical injection, an improved photonic scheme for generating high-quality FMCW is proposed and experimentally demonstrated. The experimental results indicate that, under appropriate injection parameters, the central frequency of the generated FMCW is widely tunable, and the bandwidth is larger than that obtained under a single MZM modulation. Further introducing optical feedback for suppressing the phase noise, the frequency comb contrast of the generated FMCW can be improved obviously.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.434160