METHOD OF MAKING OPTICAL FIBER WITH LOW POLARIZATION MODE DISPERSION

摘要

The disclosed method of making optical fiber (43) involves applying alternately clockwise and counterclockwise twist to the fiber as the fiber is being drawn from a preform (41), such that a permanent spin is impressed on the fiber.The torque is applied by novel means, namely, a roller (15) of geometry that causes the fiber to roll on the surface of the roller, alternately in one direction and the opposite direction. The novel technique can facilitate drawing of low PMD (polarization mode dispersion) fiber at relatively high speed.