Abstract

In this paper, the influences of the relative intensity noise, in particular the relaxation oscillation noise, of an erbium distributed feedback (DFB) fiber laser has been investigated theoretically and experimentally for use as a polarimetric ultrasonic sensor. We show that the relaxation oscillation noise and the ultrasonic signal both induce modulation sidebands on the polarization beat frequency of the DFB laser ultrasonic sensor. We present a novel demodulation algorithm for the polarimetric DFB fiber laser ultrasonic sensor, which can effectively eliminate the influences of the intensity noise and slowly varying drift of the polarization beat frequency.

Waveform reconstruction for an ultrasonic fiber Bragg grating sensor demodulated by an erbium fiber laser

Qi Wu and Yoji Okabe
Appl. Opt. 54(4) 694-698 (2015)

Passive quadrature demodulation of an ultrasonic fiber-optic interferometric sensor using a laser and an acousto-optic modulator

Guigen Liu, Yupeng Zhu, Zigeng Liu, and Ming Han
Opt. Lett. 44(11) 2756-2759 (2019)

Polarimetric heterodyning fiber laser sensor for directional acoustic signal measurement

Chengang Lyu, Chuang Wu, Hwa-Yaw Tam, Chao Lu, and Jianguo Ma
Opt. Express 21(15) 18273-18280 (2013)

Intensity-demodulated fiber-ring laser sensor system for acoustic emission detection

Ming Han, Tongqing Liu, Lingling Hu, and Qi Zhang
Opt. Express 21(24) 29269-29276 (2013)

Intensity-independent wavelength locking of diode lasers to a spectral slope of a fiber-optic sensor for ultrasonic detection

Lingling Hu and Ming Han
Opt. Express 25(25) 31017-31024 (2017)