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Photonic bandgap fibers

  • US 7,792,394 B2
  • Filed: 08/07/2008
  • Issued: 09/07/2010
  • Est. Priority Date: 12/30/2004
  • Status: Expired due to Fees
First Claim
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1. A gas analyzer comprising:

  • a light source;

    an optical fiber optically coupled to said light source, said optical fiber comprising a core and a cladding, said cladding comprising a first plurality of ring-shaped regions defined by high index material having an index of refraction, nh, and a second plurality of ring-shaped regions having a low index of refraction, nl, said first plurality of high index ring-shaped regions having an average thickness, d, and an average periodicity, Λ

    , said optical fiber further comprising one or more holes in said core or in proximity to said core for receiving a gas, said optical fiber having a sufficient interaction length such that an interaction of said gas with light from said source causes Raman scattering within said fiber and propagation of Raman-scattered light within said optical fiber; and

    at least one optical detector configured to receive the Raman-scattered light and identify and/or quantify the gas.

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