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Optical devices and methods of manufacture thereof

  • US 20020181910A1
  • Filed: 06/03/2002
  • Published: 12/05/2002
  • Est. Priority Date: 12/03/1999
  • Status: Active Grant
First Claim
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1. An optical fibre having a core, a photosensitive inner cladding and a further cladding surrounding the photosensitive inner cladding, the core being arranged to permit a light beam to travel therethrough, the fibre having a first end zone in which the inner cladding has a plurality of refractive indices along a longitudinal axis of the fibre, the fibre further having a second end at which it is compatible with a standard fibre, said refractive indices being such that in use the light beam travels along the fibre, the refractive indices defining a taper such that at a free-space end of the fibre the diameter of the core is increased to a enlarged core diameter equal to that of the core plus the inner cladding;

  • and whereby at said free-space end the fibre has a V number greater than that of the standard fibre, wherein the outer dimension of the fibre is unchanged along its length.

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