DEMODULATOR SYSTEM AND METHOD USING MULTILEVEL DIFFERENTIAL PHASE SHIFT KEYING

摘要

A demodulator and demodulation method includes an optical coupler (A) configured to receive an input signal. The optical coupler couples the signal to an even number of branches. Each branch (310) including at least one interferometer (CDM/2) configured to split, combine and interfere with an optical signal from one of within the branch or from another branch. A common optical delay (T) is disposed on one of every two branches between the optical coupler and the interferometer of the branch.