In this work, we presented directional couplers with wideband flat coupling-ratio and a microring resonator with wideband uniform extinction-ratio (ER) based on artificial-gaugefield optimization. Proof-of-concept results are obtained on SOI and SiN platforms, with 0.9dB coupling-ratio variation and 1.6dB ER variation over 100nm bandwidth.
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Wang et al. (2024) studied this question.
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