Measurement of nonlinear refractive index coefficient of optical

Details Measurement of nonlinear refractive index coefficient of optical Measurement of nonlinear refractive index coefficient of optical

1996-10-21

1998-06-30

Font, Frank G.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356361, G01B 902

Patent

active

057742170

ABSTRACT:
A measurement of nonlinear refractive index coefficient of an optical fiber with a Sagnac interferometer, comprises the steps of employing the optical fiber in a Sagnac interferometer, splitting a signal beam into two signals, launching the two split signals into the interferometer in opposite directions, combining and detecting the signals counter-propagated in the interferometer, and detecting the refractive index coefficient of the optical fiber in accordance with the difference between the two signal powers determined by a control beam. The quasi-static phase shift of the signal beam counter-propagating the same paths of the interferometer is induced by rotating the optical fiber loop of the interferometer. The present invention gives rise to little error because it does not require precise information about the pulse width of a used beam or a high-power light.

REFERENCES:
patent: 4875775 (1989-10-01), Michal et al.
patent: 5357333 (1994-10-01), DeBernardi et al.
Measurement of the nonlinear index of silica-core and dispersion-shifted fibers; K.S. Kim, R. H. Stolen, W.A. Reed and K.W. Quoi; Feb. 15, 1994; pp. 257-259.
Measurement of Fiber Nonlinear Kerr Coefficient by Four-Wave Mixing; L. Prigent and J.P. Hamaide; Sep. 1993; pp. 1092-1095.

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