Method of measuring the nonlinear refractive index in a...

Details Method of measuring the nonlinear refractive index in a... Method of measuring the nonlinear refractive index in a...

G - Physics

01

N

G01N 21/41 (2006.01) G01M 11/00 (2006.01) G01N 21/45 (2006.01)

Patent

CA 2150418

To measure the nonlinear refractive index of an optical fibre, each pulse emitted by a source (L) is split into a pair of pulses which are sent in opposite directions into an optical-fibre Sagnac interferometric loop (AS) which includes the fibre under test (F). One of the pulses of the pair is attenuated before passing through the fibre (F) in such a way that only the other one has such a power as to induce nonlinear effects in the fibre (F). The interference between parts of pulses is analysed at the output of the loop (AS) and the nonlinear refractive index is derived from a measurement of the phase shift between the two pulses of the pair.

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