Publications

We demonstrate 94 GBd PAM-4 intensity-modulation direct-detection (IM/DD) transmission in a system with only 33 GHz bandwidth limited by a brick-wall filter of an 80 GSa/s ADC.

This paper studies the up-link of a multi-user Multiple-Input Multiple-Output (MIMO) system under a fairly general channel model, subsuming a number of situations of relevant practical interest.

We treat relational database constraints as formulas in a bounded first-order logic. A database is said to be in a consistent state if all its constraints are met in that state.

This paper determines mechanisms for distributed storage that are simultaneously repair and update efficient.

The problem of designing codes to protect against server failures in a distributed storage system for frequently changing data is considered.

We present an updated survey of the known constructions and bounds for (t, m, s)-nets as well as tables of upper and lower bounds on their parameters for various bases.

This paper investigates the view update problem for XML views published from relational data. We consider (possibly) recursively defined XML views, compressed into DAGs and stored in relations.

It is demonstrated that ultra-long-haul links at 10 Gbit/s could be upgraded to 40 Gbit/s without any change to the infrastructure (fibre arrangement, amplifiers, dispersion map).

WDM networks running at 10Gb/s channel rate are now commonly deployed and the upgrade to 40Gb/s has become a major topic of research.

We show how rate-adaptive transponders help reduce the cost of optical networks compared to single and mixed-line-rate solutions through a better ability to accommodate growth of traffic and uncert