Abstract
A thermo-optic waveguide mode switch based on an asymmetric Mach–Zehnder interferometer (MZI) is demonstrated. A metal heater is deposited on one arm of the asymmetric MZI to implement switching between the LP01 and LP11 a modes. The polymer/SiO2 hybrid waveguide structure is adopted to decrease the power consumption and switching time. The fabricated device shows a mode extinction ratio of 10.5 dB with a power consumption of 15.4 mW at 1550 nm. The operation bandwidth ranges from 1525 to 1615 nm. The rise time and fall time of mode switching are 71.5 and $140.3~\mu \text{s}$ , respectively. This device has potential in configurable mode-division multiplexing systems.
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