Patent ID: 6901196
Filing Date: 2005-05-31
Classification: C03C,G02B

Abstract:
1. An optical fiber comprising a core region disposed at a center of said optical fiber and a cladding surrounding around an outer periphery of said core region, said core region, having a maximum relative refractive index difference of larger than 0.36% and a minimum relative refractive index difference of larger than −0.05% with respect to said cladding, said optical fiber having: a mode field diameter of 8 to 10 μm at a wavelength of 1310 nm; an effective area of 70 to 90 μm a zero-dispersion wavelength in the wavelength range of 1285 to 1330 nm; a fiber cut-off wavelength (λc) by a 2-meter measurement of more than 1350 nm; a cable cut-off wavelength (λcc) by a 22-meter measurement of less than 1285 nm; a chromatic dispersion at a wavelength of 1550 nm of not more than 20 ps/nm/km; a bending loss at a wavelength of 1625 nm of not more than 10 dB/m when wound at a radius of 10 mm; a transmission loss in a wavelength range of 1285 to 1625 nm of not more than 0.40 dB/km; a transmission loss at a wavelength of 1383 nm less than a transmission loss at a wavelength of 1310 nm; and a difference in the transmission loss at a wavelength of 1383 nm of not more than 0.04 dB/km between before and after exposure to hydrogen.