Abstract

A simple and novel fabrication technique for a fiber-type polarizer has been developed, and the polarization characteristics of the polarizer have been investigated. The polarizer is formed from a single-mode fiber composed of a concentric core and a silica cladding having a B2O3-doped silica portion. The cladding is etched off asymmetrically by utilizing the etching-speed difference between pure silica and B2O3-doped silica in 49% HF. The Al film is subsequently evaporated onto the etched portion. The extinction ratios of polarizers with various buffer-layer thicknesses were measured at two wavelengths, λ = 1.15 μm and λ = 1.29 μm. The maximum measured extinction ratio was 37 dB at λ = 1.29 μm for a 4-cm-long polarizer.

© 1983 Optical Society of America

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