Extra large effective core cross-sectional area (SLA) optical fiber and communication system incorporating the same,

摘要

PROBLEM TO BE SOLVED: To overcome the inconvenience of a conventional technique by providing a method for obtaining an SLA optical fiber capable of improving the difficulty in single mode application to 1,300 nm wavelength window due to a high cut-off wavelength of the present SLA fiber, and decrease in capacity of a WDM system due to an non-linear interference effect.;SOLUTION: An excellent transmission characteristic without causing increase in macro-bending loss and attenuation by dividing a core area so that the maximum value of a relative refractive index is produced at a place shifted from the center of the core in the radial direction, and thereby making an effective core area, preferably, equal to approximately 80 μm² in the wavelength window near 1,310 nm or a specially large effective core area larger than that, and further providing the core area with a very small cut-off wavelength.;COPYRIGHT: (C)2005,JPO&NCIPI