Two stage polarization insensitive regenerative wavelength converter

In future high speed optical communication networks all-optical signal processing will play an important role. The high transmission capacity of the fibre can be utilized by wavelength division multiplexing of time division multiplexed signals in the order of 10-20 Gbit/s per channel (wavelength). Therefore, signal transmission in a complex fibre network with many switching nodes requires the development of wavelength converters. A wavelength converter consisting of a semiconductor laser amplifier and an injection locked laser is investigated. The converter is insensitive to input polarization and wavelength. Input amplitude fluctuations are strongly reduced. The output signal is not inverted and nearly chirp-free

5G cross-border operation for connected and automated mobility: Challenges and solutions

The vision of cooperative, connected and automated mobility (CCAM) across Europe can only be realized when harmonized solutions that support cross-border traffic exist. The possibility of providing CCAM services along different countries when vehicles drive across various national borders has a huge innovative business potential. However, the seamless provision of connectivity and the uninterrupted delivery of services along borders also poses interesting technical challenges. The situation is particularly innovative given the multi-country, multi-operator, multi-telco-vendor, and multi-car-manufacturer scenario of any cross-border layout. This paper introduces the challenges associated to a cross-border deployment of communication technologies through the analysis of three use cases: tele-operated driving, high-definition map generation and distribution for autonomous vehicles, and anticipated cooperative collision avoidance. Furthermore, a set of 5G solutions have been identified to ensure that CCAM services can be supported efficiently in cross-border scenarios. Faster handover of a data connection from one operator to another, generalized inter-mobile edge computing (MEC) coordination, and quality of service (QoS) prediction are some of the solutions that have been introduced to reduce the uncertainties of a real 5G cross-border deployment. © 2019 by the authors