The past few years have seen an enormous effort in the field of graphene research. Most of the activities have so far been focused on electronic applications. Graphene-based photonics has yet not attracted that much attention, although graphene¿s optical properties are not less impressive than its electrical ones. It is the purpose of the proposed research to introduce graphene as a new material into photonics and to develop optoelectronic devices based on graphene. This project will cover all aspects of modern photonics, i.e. the generation, detection, and modulation of light by using graphene as an active optical medium. Due to the high mobility of both electrons and holes, graphene offers the possibility of high-speed photonic devices that are faster than today¿s state-of-the-art silicon or III-V semiconductor-based devices. Special emphasizes will hence be laid on the development of high-speed optoelectronics (photodetectors, modulators, etc.) for optical communications. Being a zero (or small) bandgap semiconductor, graphene also holds great promise for applications in the far- and mid-infrared spectral domains. It could hence play an important role in overcoming the present technological shortage of photonic devices in the long optical wavelengths regime. In particular, we will study graphene-based photodetectors for optical communications, electrically driven far- and mid-infrared light emission from p-n junctions and Landau levels, and ultrafast optical modulators. We will also explore the possibility of population inversion and lasing, and study ultrafast carrier dynamics in graphene. This project will advance state-of-the-art of graphene device technology, and will also provide new physical insights in carrier dynamics, optical response, energy level schemes and many body effects in graphene.