Mr. Sheng Zhang Profile

Sheng Zhang

at Chiral Photonics Inc

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Proceedings Article | 7 February 2009 Paper

PANDA-based in-fiber linear polarizers

Sheng Zhang, Victor Kopp, Victor Churikov, Guoyin Zhang

Proceedings Volume 7212, 72120D (2009) https://doi.org/10.1117/12.808261

KEYWORDS: Polarizers, Optical fibers, Polarization, Cladding, Birefringence, Phase modulation, Refractive index, Linear polarizers, Silica, Etching

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We demonstrate two types of in-fiber linear polarizers based on PANDA PM fibers with < 0.7 dB insertion loss, > 30 dB extinction ratio, and > 40 dB return loss. The first is a chiral fiber, realized by twisting an etched and tapered PANDA fiber. A form birefringence of 10^-2 is achieved in the noncircular fiber produced by differentially etching the pure silica cladding and the doped silica stress members. The chiral grating scatters one polarization component out of the fiber over a broad band while the orthogonal polarization component propagates freely. The second polarizer is produced in an untwisted tapered PANDA fiber. Polarization selectivity is the result of opposite modal interferometric oscillation of two orthogonal polarization components. Both types of in-fiber polarizer are all-glass, scattering, and non-absorbing devices without back-reflection and are therefore suitable for high-power applications.

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