Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 39, Issue 1, Pages 105-111Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3026722
Keywords
Semiconductor lasers; Optical pulses; Optical switches; Mathematical model; Laser feedback; Optical feedback; Photonics; Optical feedback; optical frequency combs; semiconductor lasers
Funding
- National Natural Science Foundation of China [61775158]
- China Postdoctoral Science Foundation [2018M630283, 2019T120197]
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This article presents a novel scheme for an optical frequency comb (OFC) generator using gain switched (GS) semiconductor laser (SL) and external optical feedback (EOF), which can significantly reduce the linewidth in the OFC. By selecting appropriate system parameters, the linewidth reduction can be achieved, and it can be described by a simple analytic expression presented in the article.
In this article, we propose a novel scheme for an optical frequency comb (OFC) generator which implements a gain switched (GS) semiconductor laser (SL) in the presence of external optical feedback (EOF). Numerical results demonstrate that with appropriate choices of the basic system parameters (i.e., the feedback coupling fraction, the laser bias current and the external cavity length), the linewidths in the OFCs generated by the GS SL with EOF can be significantly reduced below that of the free running continuous wave (CW) SL. Such a significant linewidth reduction can be described by a simple analytic expression presented in this article which is found to be in good agreement with the numerical results.
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