Compact adiabatic mode (de)multiplexer using a subwavelength grating waveguide in the silicon-on-insulator platform

Le résumé fourni par la source

Mode-division multiplexing technology holds great promise for addressing the ever-increasing demand for data transmission capacity. This paper proposes a compact adiabatic mode (de)multiplexer [(de)MUX] using a subwavelength grating (SWG) waveguide in the silicon-on-insulator platform, with optimization for the TE 0 -TE 1 and TE 0 -TE 2 mode (de)MUXs. By introducing an SWG waveguide, the coupling strength of waveguides can be enhanced, making it possible for the realization of more compact adiabatic mode (de)MUXs. The adiabatic evolution lengths for TE 0 -TE 1 and TE 0 -TE 2 mode (de)MUXs are only 10 µm and 17.5 µm, respectively. The numerical simulation shows that the operating bandwidth of the proposed device is beyond 200 nm. For the TE 0 -TE 1 mode (de)MUX, the insertion loss and mode crosstalk of TE 0 -TE 1 mode conversion within the whole wavelength range of 1450–1650 nm are less than 0.25 dB and −32.0dB, respectively. For the TE 0 -TE 2 mode (de)MUX, the insertion loss and mode crosstalk of TE 0 -TE 2 mode conversion within the entire bandwidth are less than 0.26 dB and −27.4dB, respectively. The TE 0 -TE 1 and TE 0 -TE 2 mode (de)MUXs can be cascaded to form a three-mode (de)MUX. For TE 0 -TE 0 , TE 0 -TE 1 , and TE 0 -TE 2 processes within the entire bandwidth, the mode crosstalks are less than −33.5dB, −26.1dB, and −25.8dB, respectively. The device is scalable to the conversion of TE 0 mode to higher-order mode.

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