Patent ID: 6501892
Filing Date: 2002-12-31
Classification: G02B,H04B

Abstract:
A dispersion-compensating fiber for compensating for a dispersion of a predetermined length of a dispersion-shifted fiber having a zero-dispersion wavelength in a 1.5 &mgr;m wavelength band, comprising:a core region extending along a predetermined reference axis and having a core with an outside diameter 2a; and a cladding region which is a region provided on the outer periphery of said core region, said cladding region having a first cladding provided on the outer periphery of said core and having an outside diameter 2b, a second cladding provided on the outer periphery of said first cladding and having an outside diameter 2c, and a third cladding provided on the outer periphery of said second cladding, wherein a refractive index n1 of said core region, a refractive index n2 of said first cladding, a refractive index n3 of said second cladding, and a refractive index n4 of said third cladding satisfy the following condition: n1>n3>n4>n2; wherein, at a wavelength of 1.55 &mgr;m, a dispersion D and a dispersion slope S of said dispersion-compensating fiber satisfy the following condition: D&lE;âˆ’50 ps/nm/km, andS/D&gE;0.01 l/nm.