Method of manufacturing an optical coupler for extracting a signal from a polarization-maintaining optical fiber and a corresponding coupler

摘要

Fused optical coupler comprising a polarization maintaining fibre and a standard fibre. The cross section of the said standard fibre is smaller than the cross section of the polarization maintaining fibre in the area of fusion of the coupler. The internal forces in the coupling area are sufficiently low to provide an extinction ratio of more than 20 dB at the output of the polarization maintaining fibre.