Open Access53-dB phase noise suppression and Hz-range linewidth emission in compact Brillouin/erbium fiber laser
Author(s) -
Mo Chen,
Chenyu Wang,
Jianfei Wang,
Hong Luo,
Meng Zhang
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.019216
Subject(s) - laser linewidth , optics , brillouin scattering , materials science , fiber laser , phase noise , brillouin zone , laser , erbium , relative intensity noise , optoelectronics , physics , semiconductor laser theory
We demonstrate 53-dB phase noise reduction in a compact Brillouin/erbium fiber laser (BEFL), which uses 4-m erbium-doped-fiber (EDF) providing both the Brillouin gain and linear gain. A 360-kHz-linewidth laser diode is used as the Brillouin pump (BP) and excites the Brillouin Stokes light. The linewidth of the BEFL is estimated 1.8-Hz based on the correlation between the linewidth and phase noise. Experimental result demonstrates 6-Hz linewidth by beating the emission of two compact BEFLs. This fiber laser provides a simple and effective method to reduce laser phase noise and realize ultra-narrow-linewidth light. It presents many applications in such as interferometric fiber sensing, coherent optical communications, optical clocks, and precise spectroscopy.