National Yang Ming Chiao Tung University

Lih-Gen Sheu

Yinchieh Lai

Kai-Ping Chuang

Meng-Chang Tsai

Kuei-Chu Hsu

Shu-Hui Chang

The present invention provides a fiber Bragg Grating sequential writing method with real-time optical fiber position monitoring, characterized in that the relative phase between a fiber grating and a writing interference beam at each positioning point is determined by an interferometric side-diffraction method, and writing is sequentially performed. Accuracy in fabricating a long and complex fiber grating structure can be increased by decreasing or avoiding accumulative errors caused by long-term scan of monitoring optical fiber position, or by a means for fabricating a wanted reference fiber Bragg grating with similar settings.

Method for sequentially writing fiber Bragg grating by using real-time side-diffraction optical fiber position monitoring

The present invention provides a two-beam interference exposure system that can be simply adjusted by rotating only one mirror. By placing a half-wave plate in one of the interference arms and precisely scanning the relative fiber position, the present invention can expose true apodized fiber Bragg gratings in a single scan by simultaneously rotating the angle of the half-wave plate. By rotationally switching the fast and slow axes of the half-wave plate, the present invention can also expose n-phase-shifted fiber grating by the same system.

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Xinwu Shiang, Taiwan

Lih-Gen Sheu