FM Noise and Spectral Linewidth Reduction by Incoherent Optical Negative Feedback

Hiroshi Yasaka, Yuzo Yoshikuni, Hitoshi Kawaguchi

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


A new, all-optical, stable, external feedback method, the incoherent optical negative feedback method, is proposed and demonstrated for spectral linewidth reduction and optical-frequency stabilization of distributed feedback (DFB) lasers. The power-spectral density of frequency modulation (FM) noise is shown to be reduced in a wide range up to several hundreds of megahertz. The spectral linewidth and the optical-frequency drift are simultaneously experimentally reduced to about 140 KHz and less than 11 MHz, respectively. The maximum reduction ratio of the power-spectral density of FM noise is about 22 dB.

Original languageEnglish
Pages (from-to)193-204
Number of pages12
JournalIEEE Journal of Quantum Electronics
Issue number2
Publication statusPublished - 1991 Feb
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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