4.7 Article

Linewidth Sharpening in Optical Frequency Combs via a Gain Switched Semiconductor Laser With External Optical Feedback

期刊

JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 1, 页码 105-111

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3026722

关键词

Semiconductor lasers; Optical pulses; Optical switches; Mathematical model; Laser feedback; Optical feedback; Photonics; Optical feedback; optical frequency combs; semiconductor lasers

资金

  1. National Natural Science Foundation of China [61775158]
  2. China Postdoctoral Science Foundation [2018M630283, 2019T120197]

向作者/读者索取更多资源

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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