Multimode optical fiber coupler and fabrication method

Optical waveguides – With optical coupler – Particular coupling structure

Reexamination Certificate

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C385S015000, C385S039000

Reexamination Certificate

active

11079683

ABSTRACT:
The present invention relates to a surface interaction type multimode optical fiber coupler. A representative embodiment of the present invention comprises a plurality of optical fibers with each having an expanded core section. The expanded core sections of the optical fibers are fused together forming a fused section. Each of the optical fibers is optically coupled with at least one other optical fiber primarily through surface interaction in the fused section. The optical fibers are suitable for multimode operations. According to an embodiment of the present invention, a method of fabrication an optical fiber coupler comprises: providing a plurality of optical fibers with each having an expanded core section; and maintaining at least a portion of the expanded core sections in contact and simultaneously heating at least a portion of the expanded core sections that are in contact to form a fused section until a predetermined end condition is reached.

REFERENCES:
patent: 4291940 (1981-09-01), Kawasaki et al.
patent: 4772085 (1988-09-01), Moore et al.
patent: 4923268 (1990-05-01), Xu
patent: 2005/0244105 (2005-11-01), Wang et al.

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