We present a pluggable radiation-tolerant 4-level Pulse-Amplitude-Modulation (PAM4) optical transmitter module called GBT20 (Giga-Bit Transmitter at 20 Gbps) for particle-physics experiments. GBT20 has an OSFP or firefly connector to input 16-bit data each at 1.28 Gbps. The GBT20 drives a VCSEL die with an LC lens or a VCSEL TOSA and interfaces an optical fiber with a standard LC connector. The minimum module, including the host connector, occupies 41 mm x 13 mm x 6 mm. At 20.48 Gbps, the minimum Transmitter Dispersion Eye Closure Quaternary (TDECQ) is around 0.7 dB. The power consumption is around 164 mW in the low-power mode. The SEE cross-section is below 7.5x10^(-14) cm^2. No significant performance degrades after a TID of 5.4 kGy.
Cite
@article{arxiv.2302.08069,
title = {GBT20, a 20.48 Gbps PAM4 Optical Transmitter Module for Particle Physics Experiments},
author = {B. Deng and L. Zhang and C. -P. Chao and S. -W. Chen and E. Cruda and D. Gong and S. Hou and G. Huang and X. Huang and C. -Y. Li and C. Liu and T. Liu and E. R. Liu and Q. Sun and X. Sun and G. Wong and J. Ye},
journal= {arXiv preprint arXiv:2302.08069},
year = {2023}
}