OPTICAL COUPLER COMPRISING MULTIMODE FIBERS AND METHOD OF MAKING THE SAME

摘要

An optical coupler is provided. It has a bundle of multimode fibers with a few-mode fiber in its centre. Such bundle is fused at one end which is the output end for the signal that is transmitted by the few-mode fiber. To make the couple r; this output end of the bundle is aligned and spliced with a large area core doubl e clad fiber while preserving the modal content of the feed-through. A method for making such optical coupler is also provided. It includes the steps of bundling a central few-mode fiber with a plurality of multimode fibers and then fusing one end of such bundle and aligning it and splicing with a large core double clad fiber, whi le preserving fundamental mode transmission from one to the other.