The versatile link, a common project for super-LHC

Abstract

A common project to develop a bi-directional, radiation tolerant, high speed (4.8 Gb/s) optical link for future high energy physics experiments is described. Due to be completed in 2012, it targets the upgrade programs of detectors installed at CERN's Large Hadron Collider (LHC). The development of radiation and magnetic field tolerant opto-electronic devices, fibre and connectors is described. Both Single-Mode and Multi-Mode versions of the system operating respectively at 850 nm and 1310 nm wavelength are proposed. First results at component and system level are presented, based mostly on commercially available devices.

CMS Technical Design Report for the Pixel Detector Upgrade

“…A key component of the AOH (its laser diode) is however no longer manufactured. It was thus decided to profit from the component selection studies being carried out in the framework of the Versatile Link project [35] that have identified both functionallysuitable and sufficiently radiation-tolerant candidate components that would be suitable for use in the phase 1 Pixel optical link. Component selection is important, as the single-mode optical fibers used in the present system must be re-used for the phase 1 upgrade.…”

Radiation Damage Studies of Lasers and Photodiodes for Use in Multi-Gb/s Optical Data Links

“…Comparison to an un-irradiated device reveals that the resonance frequency does not change appreciably during irradiation provided sufficient current is used to bias the laser after the laser threshold increases due to the irradiation. Fitting the straight line described by equation (4) to the data obtained we observe that the differential carrier lifetime above threshold decreases slightly as shown in Fig. 13.…”

“…The Versatile Link project [4] is developing a bidirectional optical physical layer to enable the deployment of optical data link systems for the transmission of timing, control and read-out data to-and from the upgraded HL-LHC detectors. One aspect of the versatility of the proposed data links is the fact that both multimode transmission at 850 nm and singlemode transmission at 1310 nm will be supported, albeit by two distinct configurations of the Versatile Link.…”

The VTRx+, an Optical Link Module for Data Transmission at HL-LHC

“…Figure 2 shows the three configurations of VTRx+ based upon such an optical coupling block and the use of the LDQ10 laser driver [2] and the GBTIA [3]. Although the GBTIA was designed for the Versatile Link project [4,5] for operation at 4.8 Gb/s when packaged with a PD directly into a TO-can based ROSA, it is possible to use it in a single-channel configuration for the VTRx+. One of the critical parameters of the VTRx+ for a number of the end users is its height.…”