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Proceedings Paper

Broadband-rejection filters using chirped and tilted fiber gratings
Author(s): Fu Liu; Tuan Guo; Bai-Ou Guan
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Paper Abstract

Broadband-trimming band-rejection filters based on chirped and tilted fiber Bragg gratings (CTFBG) are proposed and experimentally demonstrated. The flexible chirp-rate and wide tilt-angle provide the gratings with broadband filtering functions over a large range of bandwidth (from 10 nm to 150 nm), together with a low transmission loss (less than 1 dB) and a negligible back-reflection (lower than 20 dB). The slope profile of CTFBG in transmission can be easily tailored by adjusting the tilt angle, grating irradiation time and chirp rate-grating factor, and it is insensitive to polarization of launch condition. Furthermore, by coating the CTFBG with a suitable polymer (whose refractive index is close to that of the cladding glass), the cladding modes no longer form weakly discrete resonances and leave a smoothly varying attenuation spectrum for high-quality band rejection filters, edge filters and gain equalizers.

Paper Details

Date Published: 11 November 2014
PDF: 6 pages
Proc. SPIE 9274, Advanced Sensor Systems and Applications VI, 92740D (11 November 2014); doi: 10.1117/12.2072879
Show Author Affiliations
Fu Liu, Jinan Univ. (China)
Tuan Guo, Jinan Univ. (China)
Bai-Ou Guan, Jinan Univ. (China)

Published in SPIE Proceedings Vol. 9274:
Advanced Sensor Systems and Applications VI
Tiegen Liu; Shibin Jiang; Niels Neumann, Editor(s)

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