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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 36 — Dec. 20, 2011
  • pp: 6617–6626

Characterization of strong fiber Bragg gratings using an applied thermal chirp and iterative algorithm

Gary A. Miller, John R. Peele, Charles G. Askins, and Geoffrey A. Cranch  »View Author Affiliations

Applied Optics, Vol. 50, Issue 36, pp. 6617-6626 (2011)

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Coupling coefficients of various grating types and strengths are calculated from measurements of the complex reflectivity using an applied thermal chirp and optical frequency domain reflectometry (OFDR). The complex reflectivity is then utilized by a layer peeling algorithm to determine the coupling coefficient of the thermally chirped grating. A guess of the temperature profile enables the coupling coefficient of the unchirped grating to be estimated. An iterative algorithm is then used to converge on the exact coupling coefficient, employing an error minimization method applied to the reflectivity spectra. This technique removes the need for a reference grating while preserving the spatial resolution obtained with the initial OFDR measurement. Successful reconstruction of gratings with integrated | κ | L 9.0 are demonstrated with a spatial resolution of less than 100 μm .

© 2011 Optical Society of America

OCIS Codes
(060.2270) Fiber optics and optical communications : Fiber characterization
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(060.3735) Fiber optics and optical communications : Fiber Bragg gratings

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: June 27, 2011
Revised Manuscript: September 2, 2011
Manuscript Accepted: September 2, 2011
Published: December 15, 2011

Gary A. Miller, John R. Peele, Charles G. Askins, and Geoffrey A. Cranch, "Characterization of strong fiber Bragg gratings using an applied thermal chirp and iterative algorithm," Appl. Opt. 50, 6617-6626 (2011)

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