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Method of manufacturing a fiber optic directional coupler

  • US 4,536,058 A
  • Filed: 09/10/1981
  • Issued: 08/20/1985
  • Est. Priority Date: 09/10/1981
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a fiber optic directional coupler comprising:

  • A. removing a portion of the cladding from a clad fiber at a location intermediate the ends of said fiber;

    B. introducing light into one end of said fiber for propagation to the other end of said fiber;

    C. providing an index matching substance at said location, said index matching substance causing at least a portion of said light propagating through said fiber to escape from said fiber;

    D. determining the proportion of the total light introduced at said one end that propagates through said fiber to said second end;

    E. selecting a first coupling efficiency from a range of coupling efficiencies;

    F. determining the desired value of the proportion of the total light at the second end corresponding to said first coupling efficiency;

    G. performing steps a through d until said proportion of the total light at said second end is equal to said desired value;

    performing all of the foregoing steps for a second fiber; and

    accurately positioning said fibers together, with their cores in close spaced relationship at their respective predetermined locations to form a coupler having said first coupling efficiency.

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