We have designed three ASICs for possible applications in a new pixel layer (Insertable B-Layer or IBL) for the ATLAS detector for the first phase of the LHC luminosity upgrade. The ASICs are a high-speed driver for the VCSEL (VerticalCavity Surface-Emitting Laser), a receiver/decoder to decode the signal received at the PIN diode to extract the data and clock, and a clock multiplier to produce...

We describe a concept for realizing a high performance space-time reference using a stable atomic clock in a precisely defined orbit and synchronizing the orbiting clock to high-accuracy atomic clocks on the ground. The synchronization would be accomplished using a two-way lasercom link between ground and space. The basic approach is to take advantage of the highestperformance cold-atom atomic ...

The on-detector optical link of the ATLAS pixel detector contains radiation-hard receiver chips to decode bi-phase marked signals received on PIN arrays and data transmitter chips to drive VCSEL arrays. The components are mounted on hybrid boards (optoboards). We present results from the irradiation studies with 24 GeV protons up to 32 Mrad (1.2 x 10 p/cm) and the experience from the production.

IP traffic in the core and access networks increases rapidly by the speed-up of the access network and the spread of the rich applications. 10 Gigabit Ethernet (10 GE) becomes a popular link technology to connect IP routers and Ethernet switches not only intra-office transmission links but also inter-office long reach transmission links. The optical layer protection switching is expected to pro...

Due to the analytical complexity of routing and spectrum allocation policies – random-fit and first-fit, in flexigrid optical networks, it is necessary to analyze the approximate blocking probabilities. To this end, we present a novel model for reduced link state occupancy, whereby each state of a Markov chain represents the total occupied spectrum slices in a flexi-grid optical link. Using the...

This paper studies constrained optical signal-to-noise ratio (OSNR) problem via a distributed optimization approach. In multi-channel optical systems, the signal over an optical link can be regarded as an interfering noise for others, which leads to OSNR degradation. Regulating the input optical power at the Source (transmitter) aims to achieve satisfactory OSNR level at the Destination (receiv...

The paper deals with a statistical model of optical wireless links. The model is based on a combination of model of the atmospheric transmission channel at the installation site and the model of optical wireless link in ideal atmosphere. It allows an estimation of link availability based on the knowledge of the dependence of link margin on the transceiver distance for particular parameters of a...