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Concentric core optical fiber coupler

  • US 4,465,335 A
  • Filed: 10/12/1982
  • Issued: 08/14/1984
  • Est. Priority Date: 10/12/1982
  • Status: Expired due to Fees
First Claim
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1. A fiber optical coupler, comprising in combination:

  • a concentric core optical fiber element having coaxial inner and outer light conducting cores separated by intermediate cladding material and having external cladding material over said outer core;

    a region of said concentric core optical element where said external cladding material is removed exposing a predetermined length of said outer core;

    at least one single core optical fiber element having a light conducting core and external cladding covering said core;

    a region of said at least one single core element where said respective external cladding is removed exposing a predetermined length of said single core, said length of said single core thus exposed being bonded to and optically matched to the length of said exposed outer core of said concentric core element; and

    at least one other single core optical fiber element having a single light conducting core and external cladding and wherein the end of said respective single core has a numerical aperture substantially equal to and bonded to said inner core of said concentric core element.

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