Abstract
We report on developing and characterization of chalcogenide FBT single mode fiber coupler for Mid-IR fiber optics applications. Single mode 6.3μm core/123μm cladding chalcogenide fibers of IHPS RAS with homemade polishing and standard PC/AFC connectors were utilized. Two fiber coupler geometries with angles α1=70° and α2=40° between the fibers were investigated and nature of excess loss has been studied. Excess loss and coupling ratios on time for both geometries were determined. Excess losses were measured to be 7dB and 5dB for α1 and α2 geometries respectively. For α1 geometry 70:30 and for α2 geometry 55:45 coupling ratios were achieved. For α2 geometry coupling ratio at wavelength 2.64μm was 63:37.
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