Short-reach optical interconnects among servers in data centers have attracted extensive studies recently. High capacity and low cost are two key problems for optical link. In this paper, we demonstrate a band-limited 850 nm vertical cavity surface emitting laser (VCSEL) based optical transmission system. The optical link realizes 70 Gb/s (65 Gb/s net rate) non-return-to-zero (NRZ) signal transmission over 11 m and 20 m OM4 multimode fiber (MMF), with the help of equalization for time domain interference elimination. The utilized VCSEL has a bandwidth of only 18 GHz, meeting the principle of low cost. The data baud rate in this paper reaches the highest value for an 18-GHz-class 850 nm VCSEL based optical link, to our best knowledge.
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This work was supported by National Natural Science Foundation of China (Grant Nos. 61275005, 61475004).
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Tan, Z., Yang, C., Zhu, Y. et al. A 70 Gbps NRZ optical link based on 850 nm band-limited VCSEL for data-center intra-connects. Sci. China Inf. Sci. 61, 080406 (2018). https://doi.org/10.1007/s11432-017-9276-y
- 850 nm VCSEL
- 70 Gb/s NRZ
- OM4 MMF