A method and device is disclosed for dispersion compensation of an optical
signal having periodic dispersion within a multi-channels system. For
example interleaved optical channels often exhibit dispersion having a
characteristic that is repeated in adjacent channels. By providing a
periodic device in the form of a multi-cavity GT etalon having a
free-spectral range that corresponds to the channel spacing the dispersion
in the interleaved signal can be lessened and practically obviated or
balanced to a desired level. Advantageously, the input and output angle of
the signal can be varied to provide fine tuning. This invention provides a
device and method to achieve that end.
