Method and apparatus for chromatic dispersion measurements

Details Method and apparatus for chromatic dispersion measurements Method and apparatus for chromatic dispersion measurements

1993-12-30

1995-04-11

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2184

Patent

active

054063680

ABSTRACT:
A chromatic dispersion measuring method and apparatus are disclosed which permit highly accurate measurements of the wavelength dispersion characteristic of an optical transmission such as an optical fiber or an optical amplifier repeater system. Measurements are made on the propagation time of a first optical signal of a fixed wavelength through an optical transmission line to be measured and the propagation time through the same optical transmission line of a second optical signal whose wavelength can be arbitrarily set over the measuring wavelength band. By obtaining a difference between the both propagation times, it is possible to obtain only a change in the propagation time of each signal which is caused by a change in the wavelength of the second optical signal. That is, the elongation or shrinkage of the optical fiber has an equal influence on both of the first optical signal and the second optical signal, and hence does not induce an error in the detection of the above-said time difference.

REFERENCES:
patent: 4984884 (1991-01-01), Ryu et al.
Horiuchi et al "Chromatic Dispersion Measurements of 4564 Km Optical Amplifier Repeater System"; Electronics Letters; 7 Jan. 1993; vol. 29 No. I; pp. 4-5.

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