Lectures in SS 2018
Description of lectures
The lectures Optical Communication A to D (4 SWS, 6 ECTS credit points each) give in-depth insight into modern optical information transport, upon which internet and telephone net are mainly based. In their entirety these lectures provide a thoroughly founded hardware development competence for ultra-broadband communication systems – each glass fiber has about 1000 times as much bandwidth as the most powerful satellites in the microwave region. Optical transmission itself is described by the wave aspect of electromagnetic radation. In contrast, emission, amplification, manipulation (if applicable) and absorption of photons are described by the particle aspect. Starting from this dualism and from fundamental knowledge of communication and electronics an understanding of optical data transmission systems is developed. Of special significance are high-capacity wavelength division multiplex systems – >10 Tbit/s or transoceanic links are possible. The cost-effective capacity increase of existing optical fiber links is presently a big technical and economic challenge. The subtitles and main contents of the various lectures are listed in the following. The lectures B to D are not based on each other. Prior attendence of A is recommended, though.
A Fundamentals (4 SWS, 6 ECTS credit points): Maxwell’s equations, wave propagation, polarization, dielectric slab and cylindrical waveguides, dispersion, laser, photodiodes, optical amplifiers, modulation, signal formats, optical receivers, regenerators, wavelength division multiplex. Here the most important knowledge is taught.
B Mode Coupling (4 SWS, 6 ECTS credit points): Polarization mode dispersion, mode orthogonality, constant and periodic, co- and counterdirectional mode coupling, profiles of differential group delay, electrooptic effect. The function of many passive and active optical elemente is thereby explained, among others amplitude and phase modulators, broadband and wavelength-selective couplers, Bragg gratings, polarization-maintaining fibers, polarization transformers, equalizers for polarization mode dispersion and chromatic dispersion.
C Modulation Formats (4 SWS, 6 ECTS credit points): Noise in systems with optical amplifiers, data transmission by differential binary and quaternary phase shift keying in the presence of optical amplifiers, polarization division multiplex, coherent optical daten transmission, synchronous and asynchronous demodulation, coherent baseband receivers, polarization diversity, electronic compensators of optical distortions like elektronic polarization control and electronic compensation of polarization mode dispersion and chromatic dispersion, phase noise, other modulation formats. Advanced modulation formats are an important possibility for the upgrading of high-performance optical information transmission systems.
D Selected Topics (4 SWS, 6 ECTS credit points): Nonlinear distortions in glass fibers and their polarization dependence, electronic detection of linear optical distortions, polarization scrambling, ... . Nonlinear distortions are important in practice and difficult to handle. The students should also prepare topics of their choice and present them to the others.
For Bachelor students the lecture Optical Information Transmission (4 SWS, 6 ECTS credit points) is offered, identical in content with Optical Communication A.
The lecture High-Frequency Engineering (4 SWS, 6 ECTS credit points) extends the content of the lecture Theoretische Elektrotechnik by further application-relevant knowledge. The aim is to qualify the students for developent tasks for example in the radio frequency part of a mobile telephone. But considerations of high-frequency engineering are also needed in prevalent digital circuits. The emphases of the lecture are passive devices, high-frequency properties of fundamental transistor circuits, linear and nonlinear amplifiers, noisy multiports, mixers, oscillators, injection-locking and phase-locked loop.
In the following project groups alternatively small development and research tasks or a number of exquisite laboratory exercises can be conducted, for example optical data transmission at 10 Gbit/s or network analysis up to 50 GHz.
Project Optical Communications and High-Frequency Engineering (9 ECTS credit points)