All-optical phase-preserving signal amplitude processors

An all-optical signal processor comprising:

• one or more input ports configured to receive one or more optical signal channels;
• a first nonlinear optical processor configured to receive an input signal from the one or more input ports, the first nonlinear optical processor comprising one or more sections of a first nonlinear medium, wherein the input signal to the first nonlinear optical processor has a nonlinear relationship with an output signal of the first nonlinear optical processor;
• an optical phase conjugator optically configured to receive the output signal of the first nonlinear optical processor, wherein the optical phase conjugator is configured to perform at least one of:
• i) complex conjugation of an electric field of the output signal of the first nonlinear optical processor, or ii) inversion of an optical spectrum of the output signal of the first nonlinear optical processor;
• a second nonlinear optical processor configured to receive an output signal from the optical phase conjugator, the second nonlinear optical processor comprising one or more sections of a second nonlinear medium, wherein the output signal from the optical phase conjugator received by the second nonlinear optical processor has a nonlinear relationship with an output signal of the second nonlinear optical processor;
• and
• one or more output ports configured to receive the output signal from the second nonlinear optical processor.