Patent ID: 7146085
Filing Date: 2006-12-05
Classification: G01M

Abstract:
1. A method of measuring wavelength-dispersion distribution in a longitudinal direction of an optical fiber to be measured, comprising: generating pulsed probe light linearly polarized, and pulsed pump light that is different in a wavelength from said probe light but has the same polarization state; causing said pulsed probe light and said pulsed pump light to enter an optical fiber to be measured; extracting waveform data including a power variation of back-scattered light of idler light generated by four-wave mixing within said optical fiber, for each of a plurality of regions; nonlinearly fitting said waveform data extracted for said regions to a sinusoidal function expressing said power variation of said back-scattered light; respectively calculating dispersions of said waveform data extracted for said regions; and measuring said wavelength-dispersion distribution.