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-µm pulses that experience self-phase modulation in the fibers. The resultant induced grating autocorrelation response yields a value of n2/Aeff and a calibration standard for the fiber. A phase shift of the order of 0.19π 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 z25 m of fiber, whereas other approaches typically use much longer lengths of fiber z100 m.

© 2003 Optical Society of America

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