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A simple ultra-wideband dual-core SPSM PCF

A simple dual-core single-polarization single-mode (SPSM) photonic crystal fiber (PCF) is proposed. It has ultra-wide band and short coupling length, which can be tuned by the design parameters. Most importantly, the simultaneous low confinement loss transmission of 1.30/1.55μm can be obtained in the SPSM region. Also, the wavelength division demultiplexer(WDDM) can be realized by using this kind of PCF.