| 摘要 |
A dispersion compensator, which has hardly group delay ripples in a broad bandwidth, is applicable for use in a wavelength multiplex transmission system. In an interferometer, the reflection factor of one surface, which is nearly 100%, and a mirror are arranged in parallel or at a slight angle, and light emerging from the first collimator becomes incident on the second collimator after being alternately reflected two or more times between the interferometer and the mirror. An interferometer, in which at least one of the reflection factor or the thickness has been changed in the longitudinal direction, is caused to slide in the longitudinal direction, or the temperature of the interferometer is changed, to thereby make the amount of dispersion variable. These dispersion compensation units cam be provided in a multistage arrangement to realize a variable dispersion compensator which has hardly any group delay ripples in a broad bandwidth.
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