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Experimental demonstration reveals low coupling loss and alignment tolerance in integrated photonics, suggesting improved performance in co-packaged optics.
A chip-to-chip coupler between silicon nitride and silicon was experimentally demonstrated between 1480-1640 nm with an average coupling loss of 0.73 ± 0.92 dB and an average 1-dB alignment tolerance of 1.38 ± 0.24 µ m. The coupler also showed less than a ± 0.35 dB change for temperatures from 23-60° C and a 1.5 dB range across four packages.
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Weninger et al. (2025) studied this question.
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