A smart pixel bi-directional optical link using co-located emitters and detectors

A single fiber bi-directional smart pixel link is reported in this paper, which uses the co-location of an emitter and detector at each end of the fiber. To realize a fully functional communications link, CMOS analog optoelectronic receiver and transmitter circuits which had digital input/output were fabricated adjacent to the silicon detector. Digital circuitry for multiplexing, data sampling and encoding, and microprocessor interfacing were also included in this silicon integrated circuit.