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PDL Suppression on Long-Period Fiber Gratings by Azimuthally Isotropic Exposure
Yuu ISHII Kensuke SHIMA Satoshi OKUDE Kenji NISHIDE Akira WADA
IEICE TRANSACTIONS on Electronics
Publication Date: 2002/04/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fibers and Devices)
long-period fiber grating, polarization-dependent loss (PDL), birefringence, polarization mode dispersion (PMD),
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We investigate a method to suppress the polarization-dependent loss (PDL) of long-period fiber gratings (LPFGs). We study the origins of the PDL and propose an azimuthally isotropic UV exposure to suppress the UV-induced birefringence and to realize low-PDL LPFGs. By using this technique and a low birefringent fiber together, the PDL of LPFGs can be reduced to a sufficiently low level required in high performance communication systems. Moreover, the validity of our theoretical modeling is confirmed by the experimental results.