Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 32, Issue 3, Pages 170-173Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2020.2964311
Keywords
Flat-top band-rejection filter; helical long-period fiber grating; polarization-independence
Funding
- Nippon Sheet Glass Foundation for Materials Science and Engineering
- International Exchange Program of NICT
- KDDI Foundation for Research Grant Program in Japan
- Provincial Natural Science Research Projects for Higher Education Institutions [19KJD510004, 18KJB510020]
- Certificate of Scientific Research Project of Nanjing Xiaozhuang University [2018NXY19]
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A novel method enabling to produce a flat-top band-rejection filter is firstly proposed and experimentally demonstrated, which is achieved by using a phase-modulated helical long-period fiber grating (HLPG). Unlike most of the long-period fiber grating (LPG)-based and the HLPG-based band-rejection filters reported so far, the proposed band-rejection filter is inherently polarization-independent. Moreover, the proposed HLPG does not need a complex apodization in the grating's profile, which considerably facilitates the fabrication processes and makes the designed HLPG particularly suitable for fabrication with using the CO2 laser-writing platform. As a typical example, a polarization-independent band-rejection filter with a bandwidth of & x007E;10 nm& x0040;-20dB and a rejection depth of & x007E;28 dB has been successfully achieved.
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