The effects of dispersion in the highly birefringent fiber Bragg grating reflectors of a polarimetric elliptical-core fiber laser sensor are experimentally and theoretically investigated. The laser sensor is designed to measure fluid pressure. It is experimentally and theoretically shown that the wavelength-dependent phase shifts in the gratings can be employed to remove the near degeneracy of the polarization mode beat frequencies of a given order, which substantially improves the resolution of the sensor. A resolution of a few parts in 106 of the free spectral range of the laser is demonstrated.
© 2002 Optical Society of America
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(140.3510) Lasers and laser optics : Lasers, fiber
(260.1440) Physical optics : Birefringence
(260.2030) Physical optics : Dispersion
Karim Haroud, Klaus Bohnert, Andreas Frank, and Hubert Brändle, "Dispersion effects in a highly birefringent fiber laser sensor with fiber Bragg grating reflectors," Opt. Lett. 27, 897-899 (2002)