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We proposed a mode splitter based on directional coupler (DC), which is capable of splitting the TE0 and TE1 modes without changing the mode order. It is found that high coupling efficiency (higher than −1 dB), low mode crosstalk (less than −16 dB), wide bandwidth ($\sim 100$ nm), and large fabrication tolerance (±10 nm) can be obtained by a $24.4~\mu \text{m}$ coupling length DC structure, which...
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