Nonlinear optics can be used to make all-optical decisions for optical signal processing or optical computing or to switch light beams for optical communications.1 Nonlinear Fabry-Perot etalons permit many decision-making elements to operate in parallel. Nonlinear waveguide devices such as directional couplers or Mach-Zehnder interferometers may someday permit very rapid switching or processing of pipelined data.

© 1988 Optical Society of America

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