2.5D co-packaged optical I/O chipsets on a SiON/Si interposer for 4 $\times$ 100G optical interconnection

Daibao Hou; Yuntian Yao; Xiaotian Cheng; Shuning Ding; Qiyou Wu; Yonghong Hu; Wei Pan; Chao Huang; Huihui Zhu; Yongzhen Huang; Chenhui Li; Chaoyuan Jin

arXiv · 2602.08284

2.5D co-packaged optical I/O chipsets on a SiON/Si interposer for 4 $\times$ 100G optical interconnection

Daibao Hou·Yuntian Yao·Xiaotian Cheng·Shuning Ding·Qiyou Wu·Yonghong Hu·Wei Pan·Chao Huang·Huihui Zhu·Yongzhen Huang·Chenhui Li·Chaoyuan Jin

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Abstract

Optical I/O technologies have emerged as a potential industrial solution for high-performance data interconnection in AI/ML computing acceleration. While optical I/Os are deployed at the edge of computational chips by co-packaged optics (CPO), flexible and high-performance integration architectures need to be explored to address system-level challenges. In this work, we present and experimentally demonstrate a SiON/Si-based optical interposer that integrates high-bandwidth and energy-efficient optical I/O chipsets. High-performance photonic and electronic components are co-packaged on the interposer, leading to low-loss, signal-integrity-friendly, and thermally efficient characteristics. The optical interposer incorporates low-loss SiON photonic circuits to realize scalable waveguide routing and wavelength-division multiplexing (WDM) with polarization-insensitive operation and high fabrication tolerance, while supporting flip-chip integration with InP-based active devices, including electro-absorption modulated lasers (EMLs) and photodetectors (PDs). Based on this architecture, a 400-Gb/s single-fiber optical transceiver is implemented and experimentally evaluated. Clear eye diagrams and high receiver sensitivity demonstrate reliable high-speed data transmission, which offers scalable, high-bandwidth optical I/Os in future high-performance computational clusters.

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Daibao Hou, Yuntian Yao, Xiaotian Cheng, Shuning Ding, Qiyou Wu, Yonghong Hu, Wei Pan, Chao Huang, Huihui Zhu, Yongzhen Huang, Chenhui Li, Chaoyuan Jin. 2026-02-09. 2.5D co-packaged optical I/O chipsets on a SiON/Si interposer for 4 $\times$ 100G optical interconnection. https://arxiv.org/abs/2602.08284

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