Patent ID: 8958677
Filing Date: 2015-02-17
Classification: G02B

Abstract:
1. A polarization-maintaining optical fiber for use in a wavelength range of 400 to 680 nm, comprising: a core; a pair of stress-applying parts provided on both sides of the core; and a cladding surrounding the core and the stress-applying parts, wherein a diameter of the cladding is 125 μm, a diameter of each of the stress-applying parts is 33to 37 μm, a distance between the pair of stress-applying parts is 8.6 to 15.4 μm, a relative refractive index difference between the core and the cladding is 0.35 to 0.45%, and a cut-off wavelength is less than or equal to 400 nm, wherein thermal expansion coefficient of the core is in a range between 21×10 wherein thermal expansion coefficient of the stress-applying parts is in a range between 14×10