3-kHz Spectral Linewidth Laser Assembly with Coherent Optical Negative Feedback

K. Aoyama, N. Yokota, H. Yasaka

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We demonstrate the stable operation of a narrow-linewidth semiconductor laser source based on a coherent optical negative feedback system. The linewidth was reduced to 3 kHz from 13.5 MHz. The power spectral density of frequency modulation (FM) noise was reduced by 35 dB, while the relative intensity noise was low enough for a light source for optical communications (less than -140 dB/Hz). Additionally, the system showed stable operation more than an hour. Our results indicate that the instability of a laser system is caused by fluctuations in the feedback loop length due to the mechanical vibrations, which can be suppressed by the robust integration of the system.

Original languageEnglish
Article number8207612
Pages (from-to)277-280
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number3
Publication statusPublished - 2018 Feb 1


  • laser stability
  • optical feedback
  • optical resonators
  • resonator filters
  • Semiconductor lasers


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