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arXiv · 2006.11728

Prototyping of a 25 Gbps optical transmitter for applications in high-energy physics experiments

C. -P. Chao·S. -W. Chen·D. Gong·S. Hou·X. Huang·C. -Y. Li·C. Liu·T. Liu·M. Qi·J. Ye·X. Zhao·L. Zhang·W. Zhou
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Abstract

Development of optical links with 850 nm multi-mode vertical-cavity surface-emitting lasers (VCSELs) has advanced to 25 Gbps in speed. For applications in high-energy experiments, the transceivers are required to be tolerant in radiation and particle fields. We report on prototyping of a miniature transmitter named MTx+, which is developed for high speed transmission with the dual-channel laser driver LOCld65 and 850 nm VCSELs packaged in TOSA format. The LOCld65 is fabricated in the TSMC 65 nm process and is packaged in the QFN-40 for assembly. The MTx+ modules and test kits were first made with PCB and components qualified for 10 Gbps applications, and were tested for achieving 14 Gbps. The data transfer rate of the MTx+ module is investigated further for the speed of up to 25 Gbps. The LOCld65 is examined with post-layout simulation and the module design upgraded with components including the TOSA qualified for 25 Gbps applications. The PCB material is replaced by the Panasonic MEGTRON6. The revised MTx+ is tested at 25 Gbps and the eye-diagram shows a mask margin of 22 %.

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C. -P. Chao, S. -W. Chen, D. Gong, S. Hou, X. Huang, C. -Y. Li, C. Liu, T. Liu, M. Qi, J. Ye, X. Zhao, L. Zhang, W. Zhou. 2020-06-21. Prototyping of a 25 Gbps optical transmitter for applications in high-energy physics experiments. https://doi.org/10.1016/j.nima.2020.164399

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