Patent ID: 7424191
Filing Date: 2008-09-09
Classification: G01M

Abstract:
1. A measurement system for wavelength-dispersion distribution and nonlinear co-efficient comprising: a pump light source for generating pump light; a probe light source for generating probe light; a modulator for pulsing said pump light and/or said probe light; a first coupler for coupling said pulsed pump light and said pulsed probe light together and inputting them to an optical fiber to be measured; light-receiving means for wavelength-selecting either back-scattered light of said pulsed probe light occurring within said optical fiber or back-scattered light of a third light wave resulting from the process of FWM of the pump and pulse lights within the optical fiber occurring within said optical fiber, after said pulsed pump light and said pulsed probe light are input to said optical fiber, and outputting an electric signal representing a waveform of said selected scattered light; calculation means for calculating wavelength-dispersion distribution and nonlinear-coefficient distribution in a longitudinal direction of said optical fiber from a waveform of said electric signal; and branch means for branching said probe light generated by said probe light source into first light and second light; and an acoustooptic modulator for frequency-shifting said probe light by pulsing said first light; wherein said light-receiving means has a second coupler that couples back-scattered light of the pulsed probe light output from said acoustooptic modulator, and said second light branched by said branch means.