A Lorentzian narrow-linewidth demodulation scheme based on a short fiber delayed self-heterodyne technique

Zhenxu Bai, Zhongan Zhao, Xiaojing Chen, Yaoyao Qi, Jie Ding, Bingzheng Yan, Yulei Wang, Zhiwei Lu, Richard P. Mildren

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We propose a narrow-linewidth demodulation method which utilizes a short-fiber-delayed self-heterodyne structure and coherent envelope spectral properties to restore the Lorentzian line shape of the laser output. The Lorentzian spectrum obtained using our scheme is consistent with that obtained using a traditional long-delay method, and here, the utilization of a short fiber avoids the broadening caused by 1/f noise. Both simulated and experimental results demonstrate that our scheme is effective and accurate. We demonstrate the recovery of a Lorentzian linewidth of 6.0 kHz, while maintaining higher accuracy than that achieved using traditional schemes (31.7 kHz). Our approach provides a feasible means of improving the accuracy and computational efficiency of narrow linewidth measurements.

Original languageEnglish
Article number106502
Pages (from-to)106502-1-106502-6
Number of pages6
JournalApplied Physics Express
Volume15
Issue number10
DOIs
Publication statusPublished - Oct 2022

Keywords

  • demodulation method
  • linewidth measurement
  • Lorentzian
  • Self-heterodyne
  • short-fiber-delayed

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