Patent
Single mode optical fiber with intermediate layer
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TLDR
In this paper, an intermediate layer 3 having a refractive index n3 smaller than refractive indexes n1, n2 is provided between a core and a clad, and these are so constituted that these are mutually equal and of opposite polarities.Abstract:
PURPOSE:To expand a band width of transmittable light and improve transmission characteristics by providing an intermediate layer of a refractive index smaller than that of a core and a clad between the core and the clad. CONSTITUTION:An intermediate layer 3 having a refractive index n3 smaller than refractive indexes n1, n2 is provided between a core 1 having the refractive index n1 and a clad 2 having the refractive index n2 enclosing this, and these are so constituted that the refractive index difference DELTA1 between the core 1 and the clad 2 and the refractive index difference DELTA2 between the intermediate layer 3 and the clad 2 become mutually equal and of opposite polarities. With such constitution, the entire dispersion is made <=+ or -1ps/Km/nm in a wide band including the wavelengths at which the transmission losses of a quartz optical fiber becomes minimum; therefore, super wide band and super long distance transmission can be performed by WDM (wavelength multiplexing).read more
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