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, 28 (19), 1796-8

New Approach to the Measurement of the Nonlinear Refractive Index of Short ( <25 M) Lengths of Silica and Erbium-Doped Fibers

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New Approach to the Measurement of the Nonlinear Refractive Index of Short ( <25 M) Lengths of Silica and Erbium-Doped Fibers

Hernando Garcia et al. Opt Lett.

Abstract

The nonlinear refractive index n2 of silica fiber (24 m) and erbium-doped fiber (10 m) is measured to within an accuracy of 5% by use of time-delayed photorefractive beam coupling of intense 53-ps, 1.064-microm pulses that experience self-phase modulation in the fibers. The resultant induced grating autocorrelation response yields a value of n2/A(eff) and a calibration standard for the fiber. A phase shift of the order of 0.19pi can be detected and is limited only by laser amplitude fluctuations. A unique advantage of this technique is its ability to measure n2 accurately in short lengths (z < or = 25 m) of fiber, whereas other approaches typically use much longer lengths of fiber (z > or = 100 m).

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