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   Vol.E85-C    No.4    pp.934-939
Publication Date: 2002/04/01
Online ISSN: 
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.