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Proceedings Paper

High-coherence light extraction through a compact Brillouin/erbium fiber laser
Author(s): Mo Chen; Jianfei Wang; Wei Chen; Shilin Sun; Zhou Meng
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Paper Abstract

High-coherence light is stringently demanded in high-accuracy interferometric optical fiber sensors, where the phase noise of the light source greatly affects the sensitivity of the whole system. Distributed-feedback laser diodes with a phase noise of -80 ~ -90 dB/Hz1/2 at 1 kHz (with 1 m optical path difference) is now easily obtained, but the interferometric fiber sensors requires the laser source with the phase noise lower than -100 dB/Hz1/2. Lasers with ultra-low-noise usually require complicated and sophisticated techniques. We propose a novel structure to realize high-coherence light extraction through a compact Brillouin/erbium fiber laser (BEFL) which uses a length of 4 m erbium-doped fiber as both the Brillouin and linear gain media. The phase noise of the Brillouin pump light is greatly smoothed and suppressed after being transferred to the Brillouin Stokes light. High-coherence light with the phase noise of about -104 dB/Hz1/2 at 1 kHz is extracted through the compact BEFL from a commercialized laser diode with the phase noise of about -89 dB/Hz1/2. The capability of phase noise suppression in the compact BEFL presents much importance especially in large-array interferometric fiber sensor systems.

Paper Details

Date Published: 30 May 2016
PDF: 4 pages
Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162H (30 May 2016); doi: 10.1117/12.2236462
Show Author Affiliations
Mo Chen, National Univ. of Defense Technology (China)
Jianfei Wang, National Univ. of Defense Technology (China)
Wei Chen, National Univ. of Defense Technology (China)
Shilin Sun, National Univ. of Defense Technology (China)
Zhou Meng, National Univ. of Defense Technology (China)


Published in SPIE Proceedings Vol. 9916:
Sixth European Workshop on Optical Fibre Sensors
Elfed Lewis, Editor(s)

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