A system for photonic computing, preferably including: an input module, computation module, and/or control module, wherein the computation module preferably includes one or more filter banks and/or detectors. A photonic filter bank system, preferably including two waveguides and a plurality of optical filters arranged between the waveguides. A method for photonic computing, preferably including: controlling a computation module; controlling an input module; and/or receiving outputs from the computation module.