| 摘要 |
In order to perform dispersion compensation for an optical signal of light introduced from an input light collimator, a variable dispersion compensator includes: a group delay characteristic control unit which controls group delay characteristics at a group delay characteristic assignment unit; a positioning unit which positions a relative positional relationship between an optical axis position and an output light collimator in the case where the light from the input light collimator is output to an output light collimator through reflection on each of incident side planes of a plurality of reflective etalons; and a positioning control unit which controls the positioning unit so that the relative positional relationship becomes a positional relationship set in association with the group delay characteristics controlled by the group delay characteristic control unit, and minimizes loss deterioration in the case of changing the amount of dispersion compensation.
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