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Process for preparing an optical fiber sensor with enhanced sensitivity

  • US 6,035,082 A
  • Filed: 03/16/1998
  • Issued: 03/07/2000
  • Est. Priority Date: 03/16/1998
  • Status: Expired due to Term
First Claim
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1. A process for preparing an optical fiber having at least one long period grating with enhanced sensitivity, the process comprising the steps of:

  • a) providing a length of optical fiber having a refractive index profile, and wherein the optical fiber supports a core mode and cladding modes for a range of operational wavelengths;

    b) identifying group indices for the core mode and the cladding modes for a specific wavelength wherein the group indices are equal to each other; and

    c) writing a long period grating in the optical fiber wherein the long period grating has a period defined by the group indices and wherein the long period grating couples light from the core mode to a cladding mode proximate to where the group indices are equal.

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