| 摘要 |
In a method for measuring the chromatic dispersion of a light waveguide (2) an amplitude modulated broadband optical signal is fed into the optical transmission link to be measured, the transmitted signal is separated into a reference path (5), in which the modulation frequency is demodulated out of the transmitted signal, and into a measuring path (8), in which the transmitted signal is demodulated at several optical frequencies respectively, and the chromatic dispersion of the optical transmission link is determined from the phase differences (.DELTA..beta.) between the several demodulated signals of the measuring path (8) and the demodulated signal of the reference path (5). The corresponding apparatus comprises an amplitude modulated, broadband light source (3) at the input side of the light waveguide to be measured, a device (4) which separates the transmitted optical signal into a reference path (5) and a measuring path (8), a tuneable narrowband optical filter (9) in the measuring path (8), a photo detector (7, 10) in the reference path (5) and in the measuring path (8) respectively and a phase measuring device (16) provided at the output side of the two photo detectors (7, 10) for determining the phase differences respectively present between the reference and measuring path(5, 8), from which the chromatic dispersion of the optical transmission link can be determined.
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