Übertragungs- und Komponententechnik für 100Gbit/s Systeme: HHI-100GET. Abschlußbericht, Laufzeit des Vorhabens: 01.10.2007 bis 30.09.2010. Förderkennzeichen: 01BP0760

The aim of the R&D work within this project was to find solutions for efficient 100 Gbit/s transmission The systems should offer a high degree of compatibility to the existing network infrastructure and shouslydstbeems. very robust against transmission impairments, which are known to increase dramatically with increasing data rates. Linked to this development are new requirements for the electronic, optical and opto-electronic components, in particular at the transmitter and receiver side of these 100 GbE transmission systems. Therefore the additional aim was to develop technologically challenging sub-components (OE- and EO-converter) for those 100 Gbit/s systems, based on new principles. The following results were achieved: In the framework of a study it could be shown that 100 Gbit/s systems based on optical time-division multiplexing can serve as reference systems. Furthermore numerical as well as experimental investigations on future 100 Gbit/s systems were carried out. They showed that coherent systems, which allow a complete conversion of the optical field into the electronic domain, offers great advantages. Supported by the great progress in the area of electronic signal processing the coherent systems allow to compensate a number of transmission impairments in the electronic domain. This compensation is possible at the transmitter as well as at the receiver. Furthermore coherent systems allow the use of higher order QAM modulation formats (modulation of amplitude and phase), transmission with polarization multiplex and the use of techniques known from mobile communication, such as orthogonal frequency division multiplexing (OFDM). In the area of optical components the project achieved the development of a fully integrated coherent receiver based on InP. This key component for coherent systems paves the way for the success of this receiver technology with the advantages mentioned above. Coherent systems are seen as the coming standard for systems in wide area networks and are introduced into the telecommunication infrastructure already today. At the transmitter side an amplitude modulator with very high bandwidth could be demonstrated within the project. Furthermore the realisation of an IQ-modulator to generate higher order modulation formats, such as QPSK, was achieved for the first time in the material system InP. Such modulators promise more compact modulator modules with higher bandwidth in the future