The study of broadband circular polarizer based on double-helix chiral fiber long period grating

Ke-xin Yao; Dong-dong Han; Kai-li Ren

doi:10.1117/12.2654901

15 December 2022 The study of broadband circular polarizer based on double-helix chiral fiber long period grating

Ke-xin Yao, Dong-dong Han, Kai-li Ren

Proceedings Volume 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022); 1247841 (2022) https://doi.org/10.1117/12.2654901
Event: Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022, Xi'an, China

Abstract

Circularly polarized light play an important role in various areas. Compared with the circular polarizer generated in free space, the all-fiber circular polarizer based on double helix chiral long period fiber grating (CLPG) has the advantages of higher conversion efficiency, compatibility, and lower insertion loss, etc. However, circular polarizers of CLPGs have the problems of narrow bandwidth, low purity, and uneven working band, which seriously limit the performance and become a new challenge in this field. In this work, we proposed a method to efficiently generate an ultra-broadband flat-top circular polarizer by double-helix CLPGs. The mechanism of realizing the ultra-broadband and flat circular polarizer of the CLPG—which was eight times larger than that of traditional CLPGs—was elucidated. Meanwhile, a broadband and flatness circular polarizer mode coupling theory for CLPGs was proposed and established.

Citation Download Citation

Ke-xin Yao, Dong-dong Han, and Kai-li Ren "The study of broadband circular polarizer based on double-helix chiral fiber long period grating", Proc. SPIE 12478, Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 1247841 (15 December 2022); https://doi.org/10.1117/12.2654901

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KEYWORDS

Circular polarizers

Cladding

Polarization

Phase matching

Telecommunications

Optical filters

Photonics

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