Variable dispersion compensator

摘要

The present invention provides: (1) a compensator that compensates a wide range of amount of dispersion of light in a wide bandwidth band; and (2) a variable dispersion slope compensator applicable to the case where a transmission path suitable for a wavelength division multiplexing transmission system produces a wavelength dispersion slope. The present invention realizes: (1) a variable dispersion compensator that compensates a wide range of amount of dispersion of light in a wide bandwidth band; and (2) a variable dispersion slope compensator suitable for a wavelength division multiplexing transmission system. To realize the above, a dispersion compensating unit is provided with a structure in which a mirror is disposed in parallel to or with a slight angle relative to an etalon to reflect a light beam emitted from a collimator on the etalon multiple times and then emit the light beam into another collimator.