Patent ID: 8483531
Filing Date: 2013-07-09
Classification: C03B,G02B

Abstract:
1. An optical fiber imparted with a twist, which is an elastic torsion with stress, wherein a twist rate, which is the number of rotations per unit length by the twist, is represented by f(z) as a function of a position z in a longitudinal direction of the optical fiber, the f(z) having a predetermined twist cycle and being defined such that a twist rotation angle in one direction and a twist rotation angle in the opposite direction become equal to each other in the twist cycle, and wherein, when a proportionality coefficient representing circular birefringence per twist rate is denoted by g, an angular frequency is denoted by ω, external linear birefringence due to a bending and a lateral pressure is denoted by β {circumflex over (q)}