Broadband and Wavelength-Dependent Chalcogenide Optical Fiber Couplers

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We present optical fiber couplers made of As2Se3 glass. Broadband and wavelength-dependent couplers are fabricated from fibers of engineered core/cladding diameter ratios. Coupling ratios at the through-cross ports ranging from 50%–50% down to 1%–99% are achieved. The transparency of As2Se3 glass over the spectral range of 1.5–12.0 $\mu \text{m}$ makes it a material of prime interest for the fabrication of mid-infrared couplers.