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We demonstrate a thermo-optic switch for on-chip mode division multiplexing. The crosstalk was less than 17dB for the nine possible switch states over a 40 nm wavelength band.
Centre for Optical and Electromagnetic Research, State Key Laboratory for Modern Optical Instrumentation, Zhejiang Provincial Key Laboratory for Sensing Technologies, Zhejiang University, Zijingang Campus, Hangzhou 310058, China