The Extinction Ratio In Optical Two-Guide-Coupler Δβ Switches With Asymmetric Detuning

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IEEE Journal Of Quantum Electronics


Two-guide asymmetrically detuned Δβ optical coupler switches with two equal-length sections that operate as on-off switches are examined by means of the exact eigenmodes of a slab waveguide model of the coupler. Two input/output configurations are analyzed, namely (1) where a single output guide is connected to the same guide of the coupler as the input guide, and (2) where a single output guide is connected to the coupled guide. For both cases, ideal switching, i.e. complete extinction in the off state, can be obtained in the two-section Δβ coupler over a wide range of coupler lengths. The results differ from those of conventional coupled-mode theory in that when the two sections of the coupler are antisymmetrically detuned, i.e. Δ = Δ /sub 1/=- Δ /sub 2/, complete extinction can be obtained only in a few special cases.\

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