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Optical grating device with variable coating

  • US 6,181,852 B1
  • Filed: 01/26/1999
  • Issued: 01/30/2001
  • Est. Priority Date: 09/23/1998
  • Status: Expired due to Term
First Claim
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1. An article comprising a grating device, the grating device comprising:

  • a length of waveguide including a grating region comprising a plurality of spaced-apart grating elements;

    a variable coating applied on the outer surface of the waveguide proximal the grating region, the coating having a variable outer geometry so that when an axial strain is applied to the waveguide the variable coating causes the spacings between the grating elements to change to a variable degree.

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