Abstract
All-optical switching and routing of light in fibers and waveguides have the potential of handling optical signals at ultrahigh speed. The element which attracted most attention is the nonlinear directional coupler, first proposed by Jensen,1 and recently demonstrated by Friberg et al.2 In the nonlinear directional coupler light can be switched by either controlling its intensity or introducing a second control signal that induces the switching. It was recently shown that by operating the device at a critical power level, a very weak control signal is sufficient to route the input to a desired output waveguide.3
© 1988 Optical Society of America
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