Abstract

All-optical switching schemes employing a signal and a control beam in a waveguide X junction are numerically investigated, using the beam-propagation method. The structures are made from two Y junctions, one asymmetric and one symmetric, connected by a common dual-mode section. A phase-sensitive switching scheme with copropagating beams is compared with other schemes in which the signal and the control beams are mutually incoherent and counterpropagating. In principle the latter schemes permit the routing of a signal with a control beam coming from the user, or output, side of the structure; since the beams are incoherent, the switching behavior is not dependent on the relative phase between the two beams.

© 1990 Optical Society of America

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