Efficient time-domain demultiplexing with separate signal and control wavelengths in an AlGaAs nonlinear directional coupler

Efficient time-division demultiplexing using two different wavelengths, one for the signal and one for the control beam, has been implemented in an AlGaAs nonlinear directional coupler at 1550 nm. This all-optical demultiplexer makes use of cross-phase modulation and walk-off between the two wavelengths to give high contrast at both low and high powers and to eliminate the pulse break-up. Additionally, ultrafast wavelength shifting has been observed.

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