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