Cross Power And Crosstalk In Waveguide Couplers

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Journal Of Lightwave Technology


The operation of two-guide couplers is re-examined to include the effects of cross power. Two two-guide coupler structures that operate as on-off switches are analyzed using both the exact eigenmodes of a slab model of the coupler and a coupled-mode theory that takes cross-power effects into account. The two coupler configurations analyzed are with the output guide on the same side as the input guide and on the side of the coupled guide. For the proper choice of the length of the coupler in the first case, the waveguide detuning can be adjusted so that ideal switching behavior can be achieved. For the second case, full on-off switching is not possible. Excellent agreement is found between results of the coupled-mode theory and exact slab analyses.

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