30 May 2016 High-coherence light extraction through a compact Brillouin/erbium fiber laser
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Proceedings Volume 9916, Sixth European Workshop on Optical Fibre Sensors; 99162H (2016) https://doi.org/10.1117/12.2236462
Event: Sixth European Workshop on Optical Fibre Sensors (EWOFS'2016), 2016, Limerick, Ireland
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.
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Mo Chen, Jianfei Wang, Wei Chen, Shilin Sun, Zhou Meng, "High-coherence light extraction through a compact Brillouin/erbium fiber laser", Proc. SPIE 9916, Sixth European Workshop on Optical Fibre Sensors, 99162H (30 May 2016); doi: 10.1117/12.2236462; https://doi.org/10.1117/12.2236462
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