We have measured the spectral polarization-dependent losses of cascaded long-period fiber gratings composed of single, double, and triple identical gratings and fabricated by exposure of a UV laser beam on one side of a fiber. The measurement was made by use of the Mueller matrix method for scanning the wavelength of the incident beam. The polarization-dependent loss was dramatically increased as the number of cascaded gratings was increased. The formation of the UV-induced geometric birefringence in the fiber grating and its relationship to the fine interference fringes formed by cascading gratings are discussed.
© 2002 Optical Society of America
(050.2770) Diffraction and gratings : Gratings
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.2330) Fiber optics and optical communications : Fiber optics communications
(230.5440) Optical devices : Polarization-selective devices
(260.5430) Physical optics : Polarization
Byeong Ha Lee, Jaehee Cheong, and Un-Chul Paek, "Spectral polarization-dependent loss of cascaded long-period fiber gratings," Opt. Lett. 27, 1096-1098 (2002)