Abstract
A two-mode (de)multiplexer [(DE)MUX] based on a multimode interferometer coupler and a symmetric Y-junction coupler is proposed and demonstrated on an InP substrate. By introducing a phase shifter section with a thickness-detuned core layer, a miniature two-mode (DE)MUX with mode conversion of 100% is designed and demonstrated. Simulation shows that the total length of the device can be as small as 446 $\mu\text{m} $ : much shorter than other mode (DE) MUX in InP materials. Within the entire C-band wavelength range, the calculated insertion loss of the device is less than 0.7 dB, and the crosstalk is below −24 dB. A mode (DE) MUX was fabricated in InP materials, and the mode conversion of the $\text{TE}_{0}$ and $\text{TE}_{1}$ modes were successfully demonstrated.
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