Single-mode optical fiber and optical transmission systems for short wavelength transmission

摘要

PROBLEM TO BE SOLVED: To provide an optical fiber for short wavelength transmission which is in the form of an SMF (single mode fiber) with an expanded effective cross-sectional area suitable for optical communication in the 800 nm wavelength band, and is capable of eliminating limits on transmission imposed by multimode noise in an optical transmission system that uses the wavelength band.;SOLUTION: An optical fiber for short wavelength transmission includes a cladding 101 having a diameter of 125±1 μm and a uniform refractive index, and seven cores 102 each having a diameter 2a and a relative refractive index difference with respect to the cladding 101 of Δ. The seven cores 102 comprises one core 102 located in the center of the cladding 101 and six cores 102 located around the one core 102 in a hexagonal close-packed structure with an intercore spacing of Λ. The cores 102 are designed to each have a diameter 2a of 1.5 to 2.5 μm, a normalized frequency of 0.34 to 0.48, and a normalized intercore distance Λ/2a of 1.2 to 2.4.;COPYRIGHT: (C)2013,JPO&INPIT