The interferometer comprises a beam splitter, a mirror and a phase modulator. The beam splitter splits a signal into a first portion and a second portion. The mirror reflects the first portion. The first portion includes an optical path length, which is fixed. The phase modulator includes a selectively...http://www.google.fr/patents/US7068372?utm_source=gb-gplus-shareBrevet US7068372 - MEMS interferometer-based reconfigurable optical add-and-drop multiplexor
