REAL-TIME HOLOGRAPHIC FREQUENCY-DIVISION DEMULTIPLEXING - THEORETICALASPECTS

The multiplicative and low-band-pass filtering characteristics of real -time holograms in photorefractive media are proposed for use for freq uency-division demultiplexing, Several aspects of the frequency-divisi on demultiplexer are discussed and derived. These aspects are baseband demodulation of optical images, demultiplexing limits, heterodyne cro ss talk, and nonlinear cross-talk effects that are due to second- and high-order nonlinearities. The nonlinear cross talk is calculated in t wo different approaches. Both approaches indicate that nonlinear effec ts enhance the performance of this demultiplexer.