Photonic bandgap fibers
First Claim
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.
0 Assignments
0 Petitions
Accused Products
Abstract
Included among the many structures described herein are photonic bandgap fibers designed to provide a desired dispersion spectrum. Additionally, designs for achieving wide transmission bands and lower transmission loss are also discussed. For example, in some fiber designs, smaller dimensions of high index material in the cladding and large core size provide small flat dispersion over a wide spectral range. In other examples, the thickness of the high index ring-shaped region closest to the core has sufficiently large dimensions to provide negative dispersion or zero dispersion at a desired wavelength. Additionally, low index cladding features distributed along concentric rings or circles may be used for achieving wide bandgaps.
115 Citations
14 Claims
-
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; andat least one optical detector configured to receive the Raman-scattered light and identify and/or quantify the gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
Specification