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Wideband tunable wavelength-selective coupling in asymmetric side-polished fiber coupler with dispersive interlayer
We demonstrate tunable highly wavelength-selective filter based on a 2 × 2 asymmetric side-polished fiber coupler with dispersive interlayer in one of the coupling arms. The asymmetric fiber coupler is made of two side-polished fibers using identical single-mode fibers and one of the polished fibers is further chemically etched at the central evanescent coupling region to gain closer to the core. An optical liquid with different dispersion characteristics than that of silica fiber is used todoi:10.1364/oe.15.017747 pmid:19551071 fatcat:lhluyoz7pveermbzysszjmux7q