Pushing DSP-Free Coherent Interconnect to the Last Inch by Optically Analog Signal Processing
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866917957299339264 |
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| author | Zhang, Mingming Du, Haoze Wang, Xuefeng Chen, Junda Li, Weihao Hu, Zihe Chen, Yizhao Zhao, Can Wu, Hao Zhou, Jiajun Liu, Siyang Yan, Siqi Tang, Ming |
| author_facet | Zhang, Mingming Du, Haoze Wang, Xuefeng Chen, Junda Li, Weihao Hu, Zihe Chen, Yizhao Zhao, Can Wu, Hao Zhou, Jiajun Liu, Siyang Yan, Siqi Tang, Ming |
| contents | To support the boosting interconnect capacity of the AI-related data centers, novel techniques enabled high-speed and low-cost optics are continuously emerging. When the baud rate approaches 200 GBaud per lane, the bottle-neck of traditional intensity modulation direct detection (IM-DD) architectures becomes increasingly evident. The simplified coherent solutions are widely discussed and considered as one of the most promising candidates. In this paper, a novel coherent architecture based on self-homodyne coherent detection and optically analog signal processing (OASP) is demonstrated. Proved by experiment, the first DSP-free baud-rate sampled 64-GBaud QPSK/16-QAM receptions are achieved, with BERs of 1e-6 and 2e-2, respectively. Even with 1-km fiber link propagation, the BER for QPSK reception remains at 3.6e-6. When an ultra-simple 1-sps SISO filter is utilized, the performance degradation of the proposed scheme is less than 1 dB compared to legacy DSP-based coherent reception. The proposed results pave the way for the ultra-high-speed coherent optical interconnections, offering high power and cost efficiency. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11618 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pushing DSP-Free Coherent Interconnect to the Last Inch by Optically Analog Signal Processing Zhang, Mingming Du, Haoze Wang, Xuefeng Chen, Junda Li, Weihao Hu, Zihe Chen, Yizhao Zhao, Can Wu, Hao Zhou, Jiajun Liu, Siyang Yan, Siqi Tang, Ming Optics Signal Processing To support the boosting interconnect capacity of the AI-related data centers, novel techniques enabled high-speed and low-cost optics are continuously emerging. When the baud rate approaches 200 GBaud per lane, the bottle-neck of traditional intensity modulation direct detection (IM-DD) architectures becomes increasingly evident. The simplified coherent solutions are widely discussed and considered as one of the most promising candidates. In this paper, a novel coherent architecture based on self-homodyne coherent detection and optically analog signal processing (OASP) is demonstrated. Proved by experiment, the first DSP-free baud-rate sampled 64-GBaud QPSK/16-QAM receptions are achieved, with BERs of 1e-6 and 2e-2, respectively. Even with 1-km fiber link propagation, the BER for QPSK reception remains at 3.6e-6. When an ultra-simple 1-sps SISO filter is utilized, the performance degradation of the proposed scheme is less than 1 dB compared to legacy DSP-based coherent reception. The proposed results pave the way for the ultra-high-speed coherent optical interconnections, offering high power and cost efficiency. |
| title | Pushing DSP-Free Coherent Interconnect to the Last Inch by Optically Analog Signal Processing |
| topic | Optics Signal Processing |
| url | https://arxiv.org/abs/2503.11618 |