Mixed fiber infrastructures in long haul WDM-transmission

The existing global fiber infrastructure consists of different fiber types like standard single-mode fiber (G.652) and non-zero dispersion shifted fiber (NZDSF). With the introduction of transparent networking, however, optical communication signals when transmitted over such inhomogeneous fiber links, consisting of different fiber types, may exhibit unpredictable transmission performance. In an example of such an inhomogeneous fiber network, consisting of G.652 and CorningÒ LEAFÒ fiber, it is shown that by optimizing the transmission performance of the individual fiber sections, transmission over inhomogeneous network links with a mixed fiber infrastructure can be performed without incurring any additional penalties. Long-haul 10 Gb/s NRZ WDM transmission over standard singlemode fiber, NZDSF and a mixed fiber infrastructure is simulated and experimentally demonstrated. For optimized operation parameters it is demonstrated that 2500 km error-free transmission is feasible for all scenarios without use of FEC and Raman-amplification

Aluminium lithium alloy development for thixoforming

This paper presents a scientific contribution to the development of lightweight/high-performance Al -Li alloys suitable for semi-solid processing. Thermodynamic calculations identified the most promising compositions with focus on the solidus - liquidus interval, fraction of solid-versus-temperature and phase reactions. The synthesis of Al -Li precursor billets was performed by overpressure induction melting in controlled atmosphere. DTA and microstructure investigations on Al -Li specimens were carried out as well as thixocasting trials of demonstrator components. New rheocasting of Al -Li alloys was investigated to identify the potential of this alternative precursor material route. It is shown that specifically developed Al -Li alloys offer great potential for semi-solid manufacturing.ISSN:1862-5282ISSN:2195-855