The Opto-electrical conversion system for the data transmission chain of the ATLAS ITk Pixel detector upgrade for the HL-LHC

The future High-Luminosity era of the Large Hadron Collider, with its unprecedented instantaneous luminosity, will impose new challenges on the LHC experiments. ATLAS will replace its inner detector with a new all-silicon Inner Tracker (ITk), whose innermost layers will be based on pixel technology and are expected to produce a data output of about 11 Tb/s. A high-speed transmission chain with many parallel lines running at 1.28 Gb/s will transmit data from the detector to an opto-electrical conversion system. This Optosystem features custom-designed radiation-hard electronics devoted to signal equalisation, aggregation (to 10.24 Gb/s) and optical-electrical conversion.