Abstract
A novel 1×2 multimode interference photonics switch structure basedon thermal controlling effect is proposed. A ridge waveguide ofphotosensitive polymer, benzocyclobutene (BCB 4024-40) on silica clad isused as a design structure. A temperature changes as a result ofelectrode heating are analysed by employing a two-dimensional finitedifference thermal model considering both conduction and convectionmechanisms. The switching characteristics due to changes in effectiveindex are analysed by the two-dimensional finite difference beampropagation method with transparent boundary condition. The proposedstructure works well with low crosstalk level of -28 dB and lowswitching power relatively to the structural upper cladding thickness.
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