Abstract

Contributions to the acoustic signal sensitivity of fiber distributed-feedback (DFB) lasers in air are investigated both theoretically and experimentally. The theoretical results show that the dominant contribution to the laser frequency shift comes from adiabatic temperature shifts in the surrounding air at lower frequencies and from pressure at higher frequencies. The transition frequency was found to be between 5 and 20 kHz, depending on the elastic boundary conditions of the fiber laser. The acoustically induced frequency shifts of two fiber DFB lasers were measured, and the sensitivities varied from 0.61 MHz/Pa at a 100-Hz acoustic frequency to 0.34 kHz/Pa at a 15-kHz acoustic frequency.

© 1999 Optical Society of America

Polarimetric distributed feedback fiber laser sensor for simultaneous strain and temperature measurements

Oliver Hadeler, Erland Rønnekleiv, Morten Ibsen, and Richard I. Laming
Appl. Opt. 38(10) 1953-1958 (1999)

Characterization of fiber distributed-feedback lasers with an index-perturbation method

Erlend Rønnekleiv, Morten Ibsen, Michael N. Zervas, and Richard I. Laming
Appl. Opt. 38(21) 4558-4565 (1999)

Distributed-feedback fiber laser sensor for simultaneous strain and temperature measurements operating in the radio-frequency domain

O. Hadeler, M. Ibsen, and M. N. Zervas
Appl. Opt. 40(19) 3169-3175 (2001)

Performance analysis of a time-division-multiplexed fiber-optic gas-sensor array by wavelength modulation of a distributed-feedback laser

Wei Jin
Appl. Opt. 38(25) 5290-5297 (1999)

Demodulation of fiber Bragg grating sensors based on dynamic tuning of a multimode laser diode

Luís Alberto Ferreira, Envangelos Vasilios Diatzikis, Jose Luis Santos, and Faramarz Farahi
Appl. Opt. 38(22) 4751-4759 (1999)