Graded index couplers demonstrate 0.45 dB coupling loss in photonic circuits, indicating a new packaging solution.
A silicon oxynitride graded index coupler was designed to connect silicon nitride waveguides on separate chips, demonstrating a simulated coupling loss of 0.45 dB and a 1-dB alignment tolerance of ± 2.3 µ m at 1550 nm for an 11 µ m vertical chip-to-chip gap.
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Weninger et al. (2025) studied this question.
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