Modulator based high bandwidth optical readout for HEP detectors

Abstract

Optical links will be an integral part of future LHC experiments at various scales from coupled sensors to off-detector communication. We are investigating CW lasers and light modulators as an alternative to VCSELs. Light modulators are small, use less power, have high bandwidth, are reliable, have low bit error rates and are very rad-hard. We present the quality of the links at 10Gbps and the results of radiation hardness measurements for the modulators built based on LiNbO3, InP, and Si. Also we present results on modulator-based free space data links, steered by MEMS mirrors and optical feedback paths for the control loop.

Fiber-optic links based on silicon photonics for high-speed readout of trackers

“…The major advantages include low power consumption, high integration density, low manufacturing costs, high reliability, and use of single-mode fiber; a comparison of different technologies in presented in ref. [6]. Our irradiation tests also indicate that the optical elements may be sufficiently radiationtolerant to be used for reading-out trackers.…”

“…We are evaluating a commercially-available fiber-optic transceiver as a candidate technology for the upgrade of the tracking detector in the ATLAS detector at the LHC [6]. This device is manufactured by Molex 1 using a CMOS-integrated silicon photonics platform developed by Luxtera.…”

A new high-speed optical transceiver for data transmission at the LHC experiments

“…These tests evaluate sensitivity of the device to single-event effects (SEE), atom displacement damage, and ionizing radiation damage. No SEEs or bit-errors were observed for 1e12 protons/cm 2 [6]. We cannot measure just the magnitude of displacement damage caused by the protons because they induce significant ionization.…”

“…We have evaluated a novel commercially-available fiber-optic transceiver as a candidate technology for the upgrade of the hadronic calorimeter in the ATLAS detector at the LHC [6]. This device is manufactured by Molex 1 using a CMOS-integrated silicon photonics platform developed by Luxtera.…”

The new front-end electronics for the ATLAS Tile Calorimeter Phase 2 Upgrade

“…A modulator based QSFP optical module is used to drive the fibres at 9.6 Gbps upload and 4.8 Gbps download speeds. Commercial optical modulators [13] instead of versatile link driver/receivers have been studied and evaluated for cost effectiveness, small PCB footprint, and the demonstrated radiation hardness of this technology. Modulators also permit the possibility of sending the data at higher rates.…”