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Proceedings Paper

Study and fabrication of add/drop filter based on Bragg gratings reflection coupler
Author(s): Weiwei Jiang; Linyong Fan; Zhiming Liu; Peilin Tao; Jian Li; Shuisheng Jian
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Paper Abstract

Double-grating coupler based on two fiber Bragg gratings(FBGs) has the advantages of compact structure and enhanced filtering efficiency. The influences of different gratings' position in the coupling region and grating length on the filtering spectra were investigated based on the unified coupled-mode theory. The results show that, the coupling region on the left of the graing mostly affects the drop channel characteristic;the length of the grating mostly affects the drop efficiency;the transmission characteristic is best with the whole length of the coupling region Lc integral multiple of coupling lengthπ /(2Kf ) .A coupler with uniform coupling region making of two photoconductive fibers was fabricated by improved fused taper technology,then two Bragg gratings were written in the coupling region with 248nm ultraviolet laser, and a grating reflecton coupler with maximum drop reflectivity 20dB and bandwidth 0.8nm was achieved.

Paper Details

Date Published: 1 December 2009
PDF: 6 pages
Proc. SPIE 7630, Passive Components and Fiber-based Devices VI, 763028 (1 December 2009); doi: 10.1117/12.851547
Show Author Affiliations
Weiwei Jiang, Beijing Jiaotong Univ. (China)
Linyong Fan, Beijing Jiaotong Univ. (China)
Zhiming Liu, Beijing Jiaotong Univ. (China)
Peilin Tao, Beijing Jiaotong Univ. (China)
Jian Li, Beijing Jiaotong Univ. (China)
China Academy of Railway Sciences (China)
Shuisheng Jian, Beijing Jiaotong Univ. (China)

Published in SPIE Proceedings Vol. 7630:
Passive Components and Fiber-based Devices VI
Perry P. Shum, Editor(s)

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