In order to meet the needs of the interferometry fiber optic hydrophone for high-power strong coherent laser source, a
narrow linewidth distributed feedback fiber laser (DFB-FL) with high-power 16-wavelength ITU channels was developed
by the MOPA amplification technology. The output power of single wavelength laser is more than 10 mw, the laser
linewidth is less than 2 kHz, the relative intensity noise (RIN) is less than -105 dB/Hz. By comparing with other narrow
linewidth fiber lasers from NKT compony and NP Photonics compony, the performance of the linewidth of the developed
laser reaches the international advanced level. It can be used as strong coherent laser source of fiber optic hydrophone and
other hydroacoustic detection.
In this paper we report the development and laboratory performance test of a high sensitivity 3C fiber laser geophone for borehole seismic acquisition application. First we are presenting the development of the fiber laser geophone and then testing its performance in third-party testing laboratory. The performances of the fiber laser geophone such as sensitivity, micro-seismic response, noise and temperature resistance are tested. Its performance is compared with high-temperature coil geophone simultaneously. The fiber laser geophone has advantages of wider bandwidth, better low-frequency and high-frequency micro-seismic response. These advantages are crucial for downhole micro-seismic monitoring geophysical imaging and micro-seismic monitoring.
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