Non-Coherent Photonic Frequency Multiplexed Access Networks.

Optical frequency-division-multiple-access (FDMA) networks are an attractive means for exploiting the immense bandwidth available in optical fibers. A low-cost demultiplexing and detection scheme utilizes a tunable filter with direct detection (non-coherent) as opposed to coherent detection. Recent research on both amplitude-shift (ASK) and frequency-shift keyed (FSK) networks and devices is reviewed.