Measuring chromatic dispersion of fibers

Details Measuring chromatic dispersion of fibers Measuring chromatic dispersion of fibers

1983-08-08

1985-11-05

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184

Patent

active

045510199

ABSTRACT:
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 wavelenghts of the lasers by assuming a parabolic relationship between signal propagation times and wavelength. The profile can be determined by defferentiating a parabolic function fitted to the three date 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.

REFERENCES:
patent: 4257707 (1981-03-01), Liertz et al.
Costa et al., "Highly Accurate & Simple Technique for Material Dispersion Measurements in optical Fibers" Gselt Rapporti Tecnici, vol. IX-N5 (Oct. 1981), pp. 453-456. _
Jeunhomme et al., "Wavelength Dependence of Modal Dispersion in grated Index Fibers" Electronics Letters, Jun. 8, 1978, vol. 14 #12, pp. 364-366.
Franzen et al., "Measurement of Propagation Constants Related To Material Properties in High-Band width Optical Fibers" IEEE, Tour of Quan. Electronics, vol. qE15, No. 12, Dec. 1979, pp. 1409-1414.

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