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| CERN Optical Links Group | |
|---|---|
| Name | CERN Optical Links Group |
| Formation | 1990s |
| Location | Meyrin, Geneva |
| Parent organization | CERN |
| Fields | Optical communications, radiation-hard electronics, photonics |
CERN Optical Links Group
The CERN Optical Links Group is an engineering and research unit within CERN responsible for designing, validating, and deploying high-performance optical data links for particle physics experiments. The Group develops radiation-tolerant optical transceivers, serializer/deserializer electronics, and fiber-optic networks used by experiments such as ATLAS (particle detector), CMS (particle detector), LHCb, and ALICE (A Large Ion Collider Experiment). It works at the intersection of accelerator operations at the Large Hadron Collider, instrumentation programs tied to the Compact Muon Solenoid, and detector upgrade roadmaps influenced by projects like the High-Luminosity Large Hadron Collider.
The Group traces its origins to optical readout needs emerging during upgrades for the Large Electron–Positron Collider and the initial construction of the Large Hadron Collider detectors in the 1990s and 2000s. Early efforts were motivated by requirements from experiments including ATLAS (particle detector), CMS (particle detector), LHCb, and ALICE (A Large Ion Collider Experiment), and by collaborations with laboratories such as DESY, Fermilab, SLAC National Accelerator Laboratory, and Brookhaven National Laboratory. Milestones include the adoption of radiation-hard transceiver designs inspired by work at Fermilab and industrial partnerships with companies active in the optical fiber supply chain. The Group’s timeline intersects upgrade campaigns for the High-Luminosity Large Hadron Collider and detector-specific upgrade projects like the ATLAS Upgrade and CMS Upgrade.
The Group’s mission encompasses design, prototyping, validation, and lifecycle support for optical link systems that enable data acquisition for experiments hosted at CERN. Responsibilities include specifying link performance for collaborations such as ATLAS (particle detector), CMS (particle detector), LHCb, and ALICE (A Large Ion Collider Experiment), coordinating radiation testing with facilities like the CERN Proton Synchrotron and the PSI (Paul Scherrer Institute), ensuring compatibility with timing systems derived from White Rabbit (networking) and synchronization frameworks employed by the Large Hadron Collider, and maintaining spares and production oversight with vendors such as Finisar-class suppliers and specialist microelectronics houses. The Group also supports integration with trigger systems designed in concert with ATLAS Trigger and Data Acquisition and CMS Trigger teams.
R&D activities target radiation-hard optoelectronics, low-mass fiber routing, and high-speed serial links compatible with ASICs like GBT (GigaBit Transceiver) and protocols related to PCI Express-style serializers and custom protocols used in experiments. Projects include development of serializer/deserializer chips, optical modulators, and driver electronics tested against radiation fields characterized by studies at CERN Neutrinos to Gran Sasso-era facilities and modern irradiation campaigns at TRIUMF and ROV (Rutherford Appleton Laboratory). The Group pursues device-level research on vertical-cavity surface-emitting lasers inspired by industrial work in the photonics sector, collaborates on packaging approaches aligned with ATCA and μTCA standards, and evaluates emerging technologies such as silicon photonics and coherent optical transceivers originating from research at University of Cambridge, ETH Zurich, and Massachusetts Institute of Technology.
Architectures center on dense wavelength-division multiplexing strategies, multi-gigabit transceivers, and radiation-hard optical components integrated into front-end electronics of detectors. Key technologies include multi-mode and single-mode fiber installations compatible with connectors standardized by the telecommunications industry, optoelectronic modules employing laser diodes and photodiodes, serializers paired with clock-distribution systems tied to White Rabbit (networking) timing, and error-control schemes designed to meet throughput demands of experiments such as ATLAS (particle detector) and CMS (particle detector). System designs consider mechanical integration with detector supports like those used by LHCb and ALICE (A Large Ion Collider Experiment), and thermal, electromagnetic, and radiation constraints known from studies at CERN accelerators.
Major deployments include link systems for the ATLAS (particle detector) readout, the CMS (particle detector) data acquisition backbone, and optical timing distribution for LHCb. The Group contributed to upgrade deliveries for the High-Luminosity Large Hadron Collider era, coordinating mass production and quality assurance. Collaborative upgrade projects involve instrumentation consortia from institutions such as Imperial College London, University of Oxford, University of California, Berkeley, University of Wisconsin–Madison, and TU Dresden. Fielded systems have been validated through beam tests at facilities like the CERN SPS and integration campaigns in experimental caverns adjacent to the LHC.
The Group operates through formal and informal partnerships with experimental collaborations (ATLAS (particle detector), CMS (particle detector), LHCb, ALICE (A Large Ion Collider Experiment)), national laboratories (Fermilab, DESY, TRIUMF, Brookhaven National Laboratory), universities (ETH Zurich, University of Cambridge, Imperial College London), and industry vendors supplying lasers, fibers, and hybrid microelectronics such as companies in the optical transceiver market. International projects and standards engagement involve bodies like the European Organization for Nuclear Research network and technical liaison with standards groups influencing ATCA and telecom connector specifications. The Group also contributes to knowledge transfer via workshops and training coordinated with institutions including CERN Summer Student Programme participants.
Testing and validation use on-site laboratories at CERN with irradiation facilities tied to the CERN Proton Synchrotron, cryogenic testbeds, and cleanrooms for assembly and optical alignment. Instrumentation includes bit-error-rate test equipment, high-speed oscilloscopes, optical spectrum analyzers, and probe stations sourced in collaboration with university labs such as University of Geneva and national labs like ROV (Rutherford Appleton Laboratory). Integration and staging occur in experimental surface halls and underground areas proximate to the Large Hadron Collider accelerator complex.
Category:Scientific organisations based in Switzerland Category:CERN