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We proposed a 3D 4×4 optical switch using vertical multimode interference (VMMI) couplers. This device can flexibly expand vertical connectable distance varying the height of the MMI coupler. We fabricated the device with a VMMI height of 10.0 μm as well as a wide band optical switching. And we measured fundamental operation and combine results.
This letter demonstrates a compact, very low power consumption, and low crosstalk multimode interference coupler-based polymer thermooptic photonic switch. The fabricated thin-film small-area heater confirmed the simulation results with operating power consumption as low as 8.9 mW. The switching crosstalk obtained was less than - 23 dB.
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