Characteristics of Long-Period Fiber Grating Utilizing Periodic Stress Relaxation

Shigefumi YAMASAKI  Masaaki AKIYAMA  Kenji NISHIDE  Akira WADA  Ryozo YAMAUCHI  

IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.3   pp.440-443
Publication Date: 2000/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Passive and Active Devices for Photonic Sensing
long-period fiber grating,  high-silica core fiber,  CO2 laser,  

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Long-period fiber gratings (LPGs) using a high-silica core fiber are presented. A high-silica core fiber has a residual stress in the core, and the grating structure is formed by stress releasing of the core using a focused CO2 laser beam. The dependence of the transmission spectrum on temperature and tensile strength is measured, and low dependence compared with conventional LPGs is observed. These unique characteristics are caused by the difference of temperature and tensile strength changes of the effective indices for the fundamental propagation mode and the cladding mode in the high-silica core fiber.