What is an analog digital hybrid modulation

Experimental investigation of adaptive flexible digital signal processing for hybrid modulation formats

Clausen, DennisORCID

In today's world, the Internet has become an indispensable part of almost every aspect of life. In the private sector, more and more Internet-enabled mobile devices such as laptops, cell phones or tablets are being used. In the last few years, the daily way of life has changed. What a decade ago was still determined by analog television is today influenced by digital media. In addition to the requirements of mobile radio, the demands on the optical transmission systems behind it are growing in equal measure. Multi-stage modulation formats such as polarization multiplexing or quadrature amplitude modulation are already increasingly being used in optical transmissions. When considering ways to increase transmission rates, greater attention must be paid to linear and nonlinear interference as well as interference from imperfect components in optical systems. These limiting effects are given special attention in this thesis. The focus of this work is on the one hand on increasing the channel rate by modern digital signal processing and on the other hand on high-quality modulation formats in different optical transmission systems. In addition, this thesis discusses the possibility to design the data rate adaptively under given transmission conditions in dual polarization networks with wavelength division multiplexing. This is a prerequisite for supporting modern concepts determined by software. The goal of the research activity on which this work is based is to be able to design the data rate adaptively in coherent wavelength division multiplexing networks with a dense grid of less than 50 GHz. The main focus is on the investigation, optimization and experimental implementation of hybrid modulation and its digital signal processing in transmitter and receiver. Among other concepts, hybrid modulation offers a central abstraction possibility by allowing the individual data streams to be modulated independently of each other. Furthermore, this thesis shows that already common concepts of digital signal processing are applicable to hybrid modulation. The developed concept was realized by a WDM scenario with a channel spacing of 37.5 GHz and investigated in simulations and experiments. A numerical model for the investigation of glass fibers under birefringence was realized with the implementation and optimization of the solution to the Manakov-PMD equation by the split-step method. This work also performs important aspects of general digital signal processing.

Nowadays almost every area of ​​life can be imagined without the Internet. In the private sector, more and more internet-enabled mobile devices such as laptops, cell phones or tablets are being used. In recent years, the way we live has changed every day. What was determined by analog television a decade ago is now influenced by digital media. In addition to the requirements of mobile radio, the requirements for the underlying optical transmission systems are growing at the same time. Multi-stage modulation formats such as polarization multiplexing or quadrature amplitude modulation are already increasingly being used in optical communication. When considering increasing the transmission rates, one must increasingly deal with linear and non-linear interference, as well as the interference of imperfect components in optical systems. These limiting effects are considered with particular attention in this work. The focus of this work is on the one hand on increasing the channel rate through modern digital signal processing and on the other hand on high quality modulation formats in different optical transmission systems. In addition, the possibility is intensively discussed in this thesis to make the data rate adaptive under given transmission conditions in dual polarization networks with wavelength division multiplex. This is a prerequisite for supporting modern concepts that are specific to software. The aim of the research on which this work is based is to be able to adapt the data rate in coherent WDM networks with a dense grid of less than 50 GHz. The main focus is on the investigation, optimization and experimental implementation of hybrid modulation and its digital signal processing in the transmitter and receiver. In addition to other concepts, hybrid modulation offers a central abstraction option in that the individual data streams can be modulated independently of one another. In addition, this work shows that already common concepts of digital signal processing can be applied to hybrid modulation. The concept created was implemented using a WDM scenario with a channel spacing of 37.5 GHz and examined in simulations and experiments. A numerical model for the investigation of glass fibers in the case of birefringence was implemented with the implementation and optimization of the solution to the Manakov PMD equation using the split-step method. This work also covers important aspects of general digital signal processing.

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