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Optical fiber coupler with tunable coupling ratio and method of making

  • US 4,763,977 A
  • Filed: 01/09/1985
  • Issued: 08/16/1988
  • Est. Priority Date: 01/09/1985
  • Status: Expired due to Term
First Claim
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1. A unidirectional optical fiber coupler comprising a pair of virtually identical optical fibers each comprised of a core and cladding and being fused together at a narrow tapered waist, each fiber being tapered toward and away from the waist, means for translating an optical signal in single mode and carried by one fiber in the core at one side of the waist to multi-mode carried by the cladding at least adjacent the narrowest portion of the waist, and for translating the signal in multi-mode to single mode carried by the core of either said one or the other fiber or both fibers at the other side of the waist.

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