| 摘要 |
A coupler which is used with light conducting system fibers of a fiber optical communication system to couple-out and couple-in a light signal to the system fibers characterized by the coupler having at least three optical coupler fibers for connection to the system fibers and an arrangement for holding the fibers in a plane with two of the fibers converging together to have a portion of each of the fibers adjacent the end face in parallel side by side relationship with the end faces being flush and holding at least the third fiber with its end face abutting against the end faces of the pair of fibers with each of the glass fibers forming the coupler having an overall diameter which is equal to the core diameter of the system fibers which are connected thereto. Preferably, the cladding of each of the coupler fibers is as thin as possible and the coupling fibers may be embedded in a material having an index of refraction which is less than that of the cladding of the fiber to reduce light losses.
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