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Fiber for optical transmission

  • US 4,715,695 A
  • Filed: 04/11/1984
  • Issued: 12/29/1987
  • Est. Priority Date: 06/15/1983
  • Status: Expired due to Term
First Claim
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1. A fiber having only a single core for optical transmission, said core having a substantially parabolic distribution of refractive index for propagating light in a plurality of modes, said fiber further comprising:

  • a first cladding layer formed around said core having a refractive index equal to that at a peripheral portion of said core, wherein the thickness of said first cladding layer is between D/100 and d/20, where D is the diameter of said core;

    a second cladding layer formed around said first cladding layer having a refractive index smaller than that of said first cladding layer; and

    a third cladding layer formed around said second cladding layer having a refractive index greater than that of said second cladding layer, wherein said core propagates all of said plurality of modes and said cladding layers affect retardation times of said plurality of modes propagating in said core.

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