GBT20, a 20.48 Gbps PAM4 Optical Transmitter Module for Particle Physics Experiments

physics.ins-det

/ Authors

B. Deng, L. Zhang, C. -P. Chao, S. -W. Chen, E. Cruda, D. Gong, S. Hou, G. Huang, X. Huang, C. -Y. Li

and 7 more authors

C. Liu, T. Liu, E. R. Liu, Q. Sun, X. Sun, G. Wong, J. Ye

/ Abstract

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.