High-Speed/Radiation-Hard Optical Engine for HL-LHC
We have designed and fabricated a compact array-based optical engine for transmitting data at 10 Gb/s. The device consists of a 4-channel ASIC driving a VCSEL (Vertical Cavity Surface Emitting Laser) array in an optical package. The ASIC is designed using only core transistors in a 65 nm CMOS process to enhance the radiation-hardness. The ASIC contains an 8-bit DAC to control the bias and modulation currents of the individual channels in the VCSEL array. The DAC settings are stored in SEU (single event upset) tolerant registers. Several devices were irradiated with 24 GeV/c protons and the performance of the devices is satisfactory after the irradiation.
KeywordsRadiation-hard optical link High-speed optical link VCSEL array driver ASIC
The authors are indebted to Maurice Glaser/Federico Ravotti for their help in using the irradiation facility at CERN. This work was supported in part by the U.S. DOE under contract Nos. DE-SC0011726 and DE-FG-02-91ER-40690, by the NSF under Grant Number 1338024, and by the German BMBF under contract No. 056Si74.
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