Measuring chromatic dispersion of fibers

Details Measuring chromatic dispersion of fibers Measuring chromatic dispersion of fibers

G - Physics

01

N

354/29, 73/55, 7

G01N 21/25 (2006.01) G01M 11/00 (2006.01)

Patent

CA 1195138

MEASURING CHROMATIC DISPERSION OF FIBERS Abstract of the Disclosure The chromatic dispersion of an optical fiber such as a 10 to 50 km length of single mode fiber is measured by launching into the fiber the outputs of at least three commonly modulated semiconductor lasers having output wavelengths close to a region of minimum chromatic dispersion of the fiber. At a remote end of the fiber the relative phases of the signals from the three lasers are determined and a chromatic dispersion profile of the fiber is derived from the measured relative phases and the output wavelengths of the lasers by assuming a parabolic relationship between signal propagation times and wavelength. The profile can be determined by differentiating a parabolic function fitted to the three data points derived using said three lasers or by directly generating a linear relationship between chromatic dispersion and wavelength on the basis of two values of chromatic dispersion derived from these three data points. - i -

429734

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