Alcatel Lucent

Thierry Boissau

Georges Grandpierre

Loïc Becouarn

A demodulator for a DPSK-modulated optical signal of bit frequency 1/T, comprises an interferometric structure () having an input port () for receiving the DPSK-modulated optical signal, an output port (), and first and second arms () extending from said input port () to said output port (), adjustment means () for fine tuning a propagation delay difference of said two arms () in a range comprising T, an optical/electrical converter () connected to the output port () of the interferometric structure (), and a bandpass filter () connected to an output of the optical/electrical converter (), the passband of which does not include 1/T. The adjustment means () is adapted to tune the propagation delay according to the output power level of the bandpass filter ().

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Voisins Le Bretonneux, France

Thierry Boissau