The data throughput of future detector readout systems is ever increasing. To satisfy the
requirements of ultra-broad bandwidth, we propose a high-performance optical link utilizing
silicon photonics and wavelength division multiplexing. The key components are monolithically
integrated transmitter units, each comprising Echelle grating (de-)multiplexers and Mach-
Zehnder modulators. In this paper, we present the design and measurements of the building
blocks as well as the first data transmission experiment.