Patent ID: 7231121
Filing Date: 2007-06-12
Classification: C03B,C03C,G02B

Abstract:
1. An optical fiber comprising: a core which is an optical transmission medium; and a clad for surrounding the core, wherein a residual stress discontinuity at an interface between the core and the clad has a value of 20.0 MPa or less, the value being represented by an absolute value of a difference between a minimum axial stress at r/a=0.8-1.1 and a maximum axial stress at r/a=1.1-1.2, wherein a is the radius of the core and r is a distance from the center of the core, and wherein the optical fiber has a bending loss of 2.0 dB or less at a wavelength band of 850±10 nm and at the wavelength band of 1300±10 nm, when measured by winding the optical fiber 15 times around a cylinder having a radius of 5 mm.