Abstract
Wavelength-insensitive fiber couplers are made of the annealed single-mode dispersive fibers whose index differences between the core and the cladding glasses increase with wavelength. Since the produced dispersive fibers support several guided modes, they are changed into single-mode fibers with dissimilar index differences by annealing under various conditions. It becomes evident that the wavelength-insensitive region of the fabricated fiber couplers can be shifted and broadened by choosing proper annealing conditions.
[IEEE ]
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