Ultra narrow flat-top filter based on multiple equivalent phase shifts

Fei Wang; Xihua Zou; Zuowei Yin; Xiangfei Chen; Haisong Shen

doi:10.1117/12.802483

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11 November 2008 Ultra narrow flat-top filter based on multiple equivalent phase shifts

Fei Wang, Xihua Zou, Zuowei Yin, Xiangfei Chen, Haisong Shen

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Proceedings Volume 7134, Passive Components and Fiber-based Devices V; 713433 (2008) https://doi.org/10.1117/12.802483
Event: Asia-Pacific Optical Communications, 2008, Hangzhou, China

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.

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Fei Wang, Xihua Zou, Zuowei Yin, Xiangfei Chen, and Haisong Shen "Ultra narrow flat-top filter based on multiple equivalent phase shifts", Proc. SPIE 7134, Passive Components and Fiber-based Devices V, 713433 (11 November 2008); https://doi.org/10.1117/12.802483

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