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对基于铒镱共掺分布布拉格反射式光纤激光器(DBR-FL)的有源光纤水听器进行了研究。制作了腔长为8 cm的铒镱共掺DBR-FL,在抽运功率为50 mW时,激光器的输出功率达到0.263 mW;采用带法拉第旋镜的迈克尔逊干涉仪和相位载波(PGC)解调方案,解调出施加在铒镱共掺DBR FL有源光纤水听器的声信号,并通过与标准压电水听器对比得到声压灵敏度;对单频信号进行多次测量,声压灵敏度的波动小于±0.6 dB;测量了80 Hz到2.5 kHz频率范围的响应曲线,除125 Hz,200 Hz和250 Hz三个频点外,声压灵敏度已达到或超过部分文献报道中干涉型光纤水听器的灵敏度;与基于DFBFL的有源光纤水听器做了对比测试,结果表明频率响应不平坦是未对水听器进行封装和测试系统引起的。
Active fiber hydrophone based on erbium-ytterbium codoped distributed Bragg reflection fiber laser (DBR-FL) was studied. The erbium-ytterbium co-doped DBR-FL with a cavity length of 8 cm was fabricated. The output power of the laser reached 0.263 mW at a pumping power of 50 mW. The Michelson interferometer with a Faraday rotator and the phase-carrier (PGC) Tune program to demodulate the acoustic signal applied to the erbium-ytterbium co-doped DBR FL active optical fiber hydrophone and obtain the sound pressure sensitivity by comparison with a standard piezoelectric hydrophone; to measure the single-frequency signal multiple times, the sound pressure Sensitivity fluctuation is less than ± 0.6 dB. The response curve of the frequency range of 80 Hz to 2.5 kHz is measured. The sound pressure sensitivity has reached or exceeded that of some reported interference fibers except 125Hz, 200Hz and 250Hz. Hydrophone sensitivity; Compared with the DFBFL-based active fiber hydrophone, the results show that the uneven frequency response is not caused by the hydrophone packaging and testing system.