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We demonstrate a simple DFB fiber laser hydrophone and its demodulation is realized by a simple intensity based scheme. DFB fiber lasers with and without packaging structures are used as hydrophones and their measurement results are given. The frequency response of the DFB fiber laser based hydrophone is measured in an anechoic water pool. The feasibility of the hydrophone is proved by a referenced...
We proposed a novel intensity modulation based composite cavity optical fiber laser (CCFL) sensor, which is suitable for the vibration measurement. The intensity modulation of the CCFL is caused by the modulation of the weak feedback of the CCFL. The weak feedback of the CCFL is based on the end face reflection and the Rayleigh scattering of optical fiber. An acoustic measurement of the CCFL sensor...
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