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 ...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 d13 re pm/g. The frequency response range is rather fiat from 5 Hz to 300Hz.展开更多
基金This work is supported by Shandong Key Research and Development Projects （No. 2015GSF 115006）, National Nature Science Foundation （No. 61605102）, and Young Science Foundation of Shandong Academy of Sciences （No. 2016QN002）.
文摘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 d13 re pm/g. The frequency response range is rather fiat from 5 Hz to 300Hz.
