A coupler-based programmable phase logic device operates using coherent optical or microwave signals. The device is composed of a mixing stage and a logic stage and utilizes 3-port and 4-port couplers, such as integrated optic non-3dB Y-branches and integrated optic directional couplers.The device receives two coherent data input signals and three coherent control input signals and produces a coherent phase modulated data output signal. The data input signals are externally phase modulated to have one of two relative phase values, as in the binary phase shift keying (BPSK) method. The data output signal is a phase modulated signal having one of the two relative phase values that is related to the phase values of the data input signals by a Boolean logic function,such as OR, AND, NAND, or NOR. The control input signals determine the logic function performed by the device and can be changed dynamically for dynamic device operation.
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