IRT Nanoelec in Grenoble has integrated a III-V/silicon laser and silicon Mach Zehnder modulator to transmit at 25Gbit/s down a single 10km optical fibre, claiming this to be a first. “This transmission rate usually is achieved using an external source, over a 10km single-mode fibre,” said the R&D organisation, which is predicting increased bandwidth and reliability …