Second-order all-fiber comb filter based on polarization-diversity loop configuration | Zendy

Yong Wan Lee | Zendy; Hyun-Tak Kim | Zendy

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Second-order all-fiber comb filter based on polarization-diversity loop configuration

Author(s) -

Yong Wan Lee,

Hyun-Tak Kim

Publication year - 2008

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.16.003871

Subject(s) - optics , comb filter , birefringence , passband , polarization (electrochemistry) , beam splitter , materials science , physics , filter (signal processing) , band pass filter , bandwidth (computing) , telecommunications , computer science , laser , chemistry , computer vision

By concatenating three birefringence loops in series, a second-order all-fiber comb filter based on a polarization-diversity loop configuration is newly proposed. The proposed filter consists of one polarization beam splitter, polarization-maintaining fibers, and two halfwave plates. The effect of a second-order structure of polarization-maintaining fiber loops on a bandwidth of the filter passband was theoretically analyzed and experimentally demonstrated. Transmission output of the second-order filter (flat-top and narrow-band transmission spectra) could be obtained by adjusting two half-wave plates. 1 and 3 dB bandwidths of the proposed filter in flat-top and narrow-band operations were greater by approximately 102.9 and 44.3 % and smaller by approximately 47.9 and 47.1 % than those of a conventional Sagnac birefringence filter, respectively.

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