Asymmetrically Corrugated Long-Period Gratings by Burning Fiber Coating and Etching Cladding

作者：Cui Zhiquan^*; Zhang Weigang; Liu Fang; Zhang Hao; Bai Zhiyong; Geng Pengcheng; Gao Shecheng

来源：IEEE Photonics Technology Letters, 2013, 25(20): 1961-1964.

DOI：10.1109/LPT.2013.2275007

• CO2 laser
• etching
• asymmetric
• corrugated long-period fiber grating
• loss tunable

A novel method to form asymmetrically corrugated long period fiber gratings (LPFGs) by periodically scanning the unstripped optical fiber using the high-frequency CO2 laser under side illumination as well as HF etching processing has been proposed and demonstrated in this letter. Microbends exist in the asymmetric structures when tensile force is applied that greatly enhance the refractive index modulation. Several asymmetrically corrugated LPFGs with a grating pitch of 600 mu m are fabricated. A linearly step-changed period chirped corrugated LPFG has also been fabricated that well proves the flexibility of this method in fabricating nonuniform corrugated LPFGs.

• 出版日期2013-10-15
• 单位南开大学