an early form of polarisationserhaltende fiber manufacturing process

摘要

A pair of stress applying portions (23) in the cladding layer (22) of the optical fiber (24), are arranged such that angles formed by the lines connecting the centers of respective stress applying portions with the center of the core (21), is less than or equal to 3[deg]. An independent claim is included for PANDA-type polarization maintaining optical fiber manufacturing method.