Design of Wide-Band Frequency Shift Technology by Using Compact Brillouin Fiber Laser for Brillouin Optical Time Domain Reflectometry Sensing System

A novel wide-band optical frequency shift technology by using a compact single-frequency Brillouin fiber laser (BFL) configured with high-doped Er 3+ fiber and high nonlinear fiber (HNLF) is proposed and investigated experimentally. By adjusting variable optical attenuator (VOA) to eliminate the fre...

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Bibliographic Details
Published in:IEEE photonics journal 2012-10, Vol.4 (5), p.1686-1692
Main Authors: Hao, Yunqi, Ye, Qing, Pan, Zhengqing, Yang, Fei, Cai, Haiwen, Qu, Ronghui, Zhang, Qinyuan, Yang, Zhongmin
Format: Article
Language:English
Subjects:
Brillouin fiber laser (BFL)
Brillouin optical time domain reflectometry (BOTDR)
Brillouin zone
Detection
distributed fiber sensor (DFS)
Fiber lasers
Laser excitation
Lasers
Optical fiber sensors
Optical fibers
Oscillations
Pump lasers
Reflectometry
Scattering
Sensors
Time domain
wide-band optical frequency shift technology
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Summary:A novel wide-band optical frequency shift technology by using a compact single-frequency Brillouin fiber laser (BFL) configured with high-doped Er 3+ fiber and high nonlinear fiber (HNLF) is proposed and investigated experimentally. By adjusting variable optical attenuator (VOA) to eliminate the free-running oscillation in the fiber ring cavity, a stable single-frequency BFL will be considered as local oscillator (LO) for coherent detection in Brillouin optical time domain reflectometry (BOTDR) sensing system. The BFL operates at 1549.06 nm red-shifted 0.084 nm (about 10.5 GHz) from the pump seed laser. The laser signal-to-noise ratio (SNR) is larger than 50 dB and the laser linewidth is about 3.1 kHz. Applying the BFL to the BOTDR system, the measured results show that the beat frequency between the spontaneous Brillouin scattering (SBS) and the LO is about 420 MHz and the frequency fluctuation is less than ± 2 MHz for 20-km sensing fiber.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2012.2213243