Laser linewidth measurement based on long and short delay fiber combination

We present a numerical calculation with iterative algorithm method for accurately measuring laser linewidth. In this new method, the self-heterodyne spectrum of long delay fiber is calculated as the initial value, and the short delay self-heterodyne spectrum is demodulated with iterative algorithm t...

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Veröffentlicht in:Optics express 2021-08, Vol.29 (17), p.27118-27126
Hauptverfasser: Xue, Mingyuan, Zhao, Juanning
Format: Artikel
Sprache:eng
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Zusammenfassung:We present a numerical calculation with iterative algorithm method for accurately measuring laser linewidth. In this new method, the self-heterodyne spectrum of long delay fiber is calculated as the initial value, and the short delay self-heterodyne spectrum is demodulated with iterative algorithm to realize the accurate measurement of laser linewidth. The method can eliminate the influence of 1/f noise on the measurement spectrum broadening, so it provides a powerful way for accurate measurement of narrow linewidth.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.428787