Patent ID: 7593612
Filing Date: 2009-09-22
Classification: G02B

Abstract:
1. An optical fiber comprising: a center core region; a cladding layer formed around the center core region, the cladding layer having a refractive index lower than a refractive index of the center core region; a tension-absorbing cladding layer formed around the cladding layer, the tension-absorbing cladding layer having a refractive index equal to or higher than the refractive index of the center core region, wherein the center core region has a relative refractive index difference Δ the tension-absorbing cladding layer has a relative refractive index difference Δ a ratio of an outer diameter of the tension-absorbing cladding layer to an outer diameter of the cladding layer is 1.10 to 1.40; and an inner cladding layer formed between the center core region and the cladding layer, the inner cladding layer having a refractive index lower than the refractive index of the cladding layer, wherein a relative refractive index difference Δ a difference between the relative refractive index difference Δ a ratio of an outer diameter of the inner cladding layer to a diameter of the center core region is 3.0 to 4.5.