Ju. Kung et al., ALL-OPTICAL MULTIPLEXING OF FEMTOSECOND SIGNALS USING AN ALGAAS NONLINEAR DIRECTIONAL COUPLER, Electronics Letters, 31(2), 1995, pp. 118-119
The authors demonstrate multiplexing of femtosecond signals without th
e usual 3dB loss of conventional passive multiplexers using an AlGaAs
nonlinear directional coupler controlled by strong pump pulses.