Patent ID: 9720264
Date: 2017-08-01
CPC Classifications: C03B,G02B,G02F,Y02P

Claim:
1. A method for producing a polarization-maintaining optical fiber, consisting of a core region and stress applying parts embedded in the fiber body, comprising the following method steps: producing recesses in the form of circular sectors on the cross-sectional area of a core preform by removing the material on the outer surface in parallel to the longitudinal axis of the core preform at positions located diametrically opposite to one another, filling the recesses with stress applying rods, sheathing the filled core preform with a jacketing tube to produce the preform for the subsequent drawing process, preparing the preform for a fiber drawing process, drawing the prepared preform to form the polarization-maintaining optical fiber; and the ratio of the internal diameter of the recesses in the form of circular sectors to the core diameter is less than 3.0, preferably less than 2.0, and the ratio of the external diameter of the recess in the form of a circular ring to the diameter of the cladding of the preform/fiber is less than 0.9 and preferably less than 0.8.