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Proceedings Paper

Ultra narrow flat-top filter based on multiple equivalent phase shifts
Author(s): Fei Wang; Xihua Zou; Zuowei Yin; Xiangfei Chen; Haisong Shen
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Paper Abstract

Instead of real phase shifts, equivalent phase shifts (EPS) are adopted to construct ultra narrow phase-shifted band-pass filer in sampled Bragg gratings (SBG). Two optimized distributions of multiple equivalent phase shifts, using 2 and 5 EPSs respectively, are given in this paper to realize flat-top and ripple-free transmission characteristics simultaneously. Also two demonstrations with 5 EPSs both on hydrogen-loaded and photosensitive fibers are presented and their spectrums are examined by an optical vector analyzer (OVA). Given only ordinary phase mask and sub-micrometer precision control, ultra-narrowband flat-top filters with expected performance can be achieved flexibly and cost-effectively.

Paper Details

Date Published: 11 November 2008
PDF: 7 pages
Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 713433 (11 November 2008); doi: 10.1117/12.802483
Show Author Affiliations
Fei Wang, Nanjing Univ. (China)
Xihua Zou, Southwest Jiaotong Univ. (China)
Zuowei Yin, Nanjing Univ. (China)
Xiangfei Chen, Nanjing Univ. (China)
Haisong Shen, Nanjing Univ. (China)


Published in SPIE Proceedings Vol. 7134:
Passive Components and Fiber-based Devices V
Ming-Jun Li; Ping Shum; Ian H. White; Xingkun Wu, Editor(s)

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