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Opt Lett. 2003 Apr 15;28(8):598-600.

Local coupling-coefficient characterization in fiber Bragg gratings.

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  • 1Institute of Applied Optics, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland.


We propose a new method for characterizing the local parameters of fiber Bragg gratings. This method combines measurement of the complex impulse response by optical low-coherence reflectometry and reconstruction of the complex coupling coefficient by layer peeling. Application of the method to a nonhomogeneous grating shows that the local coupling coefficient can be precisely determined with an axial resolution below 20 microm and a maximum error of less than 5% for amplitude and phase, respectively.

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