Patent ID: 6463195
Filing Date: 2002-10-08
Classification: G02B

Abstract:
A method of manufacturing a polarization-maintaining optical fiber coupler, comprising the steps of:heating lengthwise portions of two polarization-maintaining optical fibers extending side by side; and elongating said heated portions to thereby form a fused-elongated section, wherein elongation is terminated when cyclic changes in a coupling ratio of two polarized waves according to an elongation length at a wavelength in use are both within first two cycles, wherein a cyclic change is defined as a change in the coupling ratio which starts increasing from 0%, reaches 100% then decreases to 0%, and two cycles are defined as the repetition of one cyclic change twice, so that said coupling ratio of one of said polarized waves is equal to or less than 10% and said coupling ratio of the other one of said polarized waves is equal to or greater than 90%.