Fig. 1. Diagram illustrating the cocktail party problem with 3 transmitters and 3 receivers.

Fig. 2. Schematic of a common single-output photonic BSS circuit. TD, tunable delay; AM, amplitude modulator; TA, tunable attenuator; PD, photodiode; ADC, analog-to-digital converter^[42].

Fig. 3. Schematic of an ASE-based stealth communication system^[9].

Fig. 4. Schematic of a chaos-based free-space optical stealth communication system^[48].

Fig. 5. Micrograph of a 4-ring single-pole through-drop resonator weight bank with schematics showing control, input, and output signals^[56].

Fig. 6. Schematic of a through-drop resonator based photonic neuromorphic circuit^[17].

Fig. 7. Block diagram of a scalable digital electronic and analog photonic neuromorphic processor^[59].

Fig. 8. Schematic of a WDM-compatible GST-based attenuator bank^[22].