Short cavity DFB fiber laser based vector hydrophone for low frequency signal detection
Xiaolei Zhang , Faxiang Zhang , Shaodong Jiang , Li Min , Ming Li , Gangding Peng , Jiasheng Ni , Chang Wang
Photonic Sensors ›› 2016, Vol. 7 ›› Issue (4) : 325 -328.
Short cavity DFB fiber laser based vector hydrophone for low frequency signal detection
A short cavity distributed feedback (DFB) fiber laser is used for low frequency acoustic signal detection. Three DFB fiber lasers with different central wavelengths are chained together to make three-element vector hydrophone with proper sensitivity enhancement design, which has extensive and significant applications to underwater acoustic monitoring for the national defense, oil, gas exploration, and so on. By wavelength-phase demodulation, the lasing wavelength changes under different frequency signals can be interpreted, and the sensitivity is tested about 33 dB re pm/g. The frequency response range is rather flat from 5 Hz to 300 Hz.
Short cavity distributed feedback fiber laser / vector hydrophone / frequency response / phase noise / sensitivity
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