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Abstract
A low-cross-talk and thermo-insensitive ${1} \times {4}$ coarse wavelength-division multiplexing device is proposed on the silicon-on-insulator platform with the help of compact Mach–Zehnder interferometers (MZIs) and slot waveguides. The compact MZIs are used to achieve wavelength-insensitive power splitting. In the phase shifters, the trade-off between the opposite thermo-optical coefficients of the Si core and SU8 cladding in the slot waveguide is used to overcome the strong thermo-optic effect of silicon. The simulated results show that the cross talk is less than ${-}{20}\;{\rm dB}$ at central wavelengths and the temperature-dependent wavelength shift is reduced to ${\sim}{4.7}\;{\rm pm/}^\circ {\rm C}$. For the four channels, the 1-dB and 3-dB bandwidths are ${\sim}{14}\;{\rm nm}$ and ${\sim}{18}\;{\rm nm}$, respectively.
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