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High index-contrast nanophotonic devices are key components for future board-to-board and chip-to-chip optical interconnects: The strong confinement of light enables dense integration, and nonlinear effects can be exploited at low power levels. Cheap large-scale production is possible by using highly parallel microfabrication techniques, and semiconductor-based nanophotonic devices can be integrated together with electronic circuitry on a common chip. Particularly intense research is carried out to realise optical devices on silicon substrates, using mature complementary metal-oxide-semiconductor (CMOS) fabrication techniques.This book discusses the modelling, fabrication and characterization of linear and nonlinear nanophotonic devices. Roughness-related scattering loss in high index-contrast waveguides is investigated both theoretically and experimentally, and methods of loss reduction are developed. Novel silicon-based devices for electro-optic modulation and for all-optical signal processing are presented. Nonlinear dynamics in active quantum-dot devices are studied, and resonant field enhancement is exploited to improve the efficiency of nonlinear interaction.
Optische Signalverarbeitung --- Optische Nachrichtentechnik --- Silizium-Photonik --- PhotonikIntegrierte Optoelektronik --- SOI-Technik --- Nanophotonik --- Silizium-Optik --- Nichtlineare Optik --- Integrierte Optik
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A software-defined optical Tx is designed and demonstrated generating signals with various formats and pulse-shapes in real-time. Special pulse-shapes such as OFDM or Nyquist signaling were utilized resulting in a highly efficient usage of the available fiber channel bandwidth. This was achieved by parallel data processing with high-end FPGAs. Furthermore, highly efficient Rx algorithms for carrier and timing recovery as well as for polarization demultiplexing were developed and investigated.
parallel processing with FPGA --- Optical communications --- coherent systems --- Parallele Prozessierung mit FPGA --- real-time transmitters and receivers --- Optische Nachrichtentechnik --- Kohärente Systeme --- Digitale Signalprozessierung --- digital signal processing --- Echtzeitfähige Sender und Empfänger
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