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A compact all-photonic-crystal-fiber (all-PCF) polarizer based on fused-type mode-selective fiber coupler is proposed theoretically. Around the wavelength of 1550 nm, the injected unpolarized fundamental mode in the solid-core PCF was selectively coupled into one polarization-mode of polarization-maintained photonic crystal fiber (PMPCF) by welldefined fiber cladding reduction, pretapering and fusion. Numerical simulations indicate the polarization direction of the excited polarization-mode depends on the tapered diameters of solid-core PCF and PMPCF. Moreover, the operation bandwidth of the proposed polarizer is more than 400 nm, which can completely cover the bandwidth of the erbiumdoped solid-core PCF amplified spontaneous emission (ASE) light source. The all-PCF polarizer is anticipated to serve as the key element in the PCF optic gyroscope.
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Hu Liang, Xiaoming Zhao, Maochun Li, Bohan Liu, Jun Ma, Jie Yu, "All-photonic-crystal-fiber polarizer based on mode-selective coupling," Proc. SPIE 11554, Advanced Sensor Systems and Applications X, 1155413 (10 October 2020); https://doi.org/10.1117/12.2573542