FG Hochfrequenztechnik-Photonik

10 Items

Recent Submissions
Design and performance analysis of integrated focusing grating couplers for the transverse-magnetic TM00 mode in a photonic BiCMOS technology

Georgieva, Galina ; Voigt, Karsten ; Peczek, Anna ; Mai, Christian ; Zimmermann, Lars (2020-04-08)

Focusing grating couplers for the excitation of the fundamental transverse-magnetic (TM) mode in integrated silicon photonic waveguides are designed and characterized under the boundary conditions of a photonic BiCMOS foundry. Two types of waveguide geometries are considered – a nanowire and a rib waveguide. Wafer-scale experimental results for nanowire TM grating couplers are in excellent agre...

Tunable lasers on a polymer-based hybrid photonic integration platform

Felipe Mesquida, David de (2020)

Durchstimmbare Halbleiterlaser als miniaturisierte optische Quellen mit der Fähigkeit bei verschiedenen Wellenlängen zu emittieren sind Schlüsselelemente in diversen Anwendungen, von Telekommunikation bis Sensorik. Viele Ansätze wurden in der Literatur untersucht um integrierte Lösungen anzubieten, die sowohl ihre Miniaturisierung als auch ihre Kointegration mit anderen optischen Funktionalität...

Impact of stochastic transmission effects on the design of digital back propagation

Goroshko, Kseniia (2020)

During the last three decades optical telecommunications industry is constantly pushing for new data transmission capacity limits. With a nowadays paradigm of coherent communication, one of the ways to increase the data rates is closely related to increasing the signal transmission power. That in turns allows reaching higher optical signal-to-noise ratio (OSNR). An intrinsic part of this soluti...

Untersuchung der Degradation von InAlGaN-basierten ultravioletten Leuchtdioden zur Verbesserung der Zuverlässigkeit

Glaab, Johannes (2019)

Zentraler Bestandteil dieser Arbeit ist die Untersuchung des Degradationsverhaltens von ultravioletten (UV) Leuchtdioden (LEDs), die im UV-C (200 nm bis 280 nm) und UV-B (280 nm bis 340 nm) Spektralbereich emittieren. Als Degradationsverhalten ist dabei die Änderung von elektrooptischen Parametern, wie beispielsweise der optischen Leistung oder der Strom-Spannungskennlinie im Betrieb bei konsta...

Investigation of perovskite-CIGSe tandem solar cells

Wang, Yajie (2019)

Multi-junction photovoltaic devices have received much attention for a long time due to their potential performance beyond the Shockley-Queisser (S-Q) limit compared with the current (commercially available) single junction solar cells. Thin film solar cells based on polycrystalline Cu(In,Ga)(S,Se)2 (CIGSe) absorbers and hybrid organic-inorganic perovskite solar cells have reached power convers...

Optical feedback effects within 1.55 μm InP-based DFB laser integrated Mach-Zehnder modulators for up to 100 GBd data transmission

Lange, Sophie Gloria (2019)

Indium phosphide-based 1550 nm wavelength optical transmitters are developed, suitable for next generation transceiver modules for intra- and inter-data center connections from a few kilometers to tens of kilometers range. The challenges of designing high-speed, low power and low-cost transceivers for future data centers are met by integrating a high bandwidth and low switching voltage travelli...

Optimization of broad-area GaAs diode lasers for high powers and high efficiencies in the temperature range 200-220 K

Frevert, Carlo (2018)

GaAs-based high-power broad area (BA) diode lasers are the most efficient light source in converting electrical into optical energy. Their high power densities, small footprint and high reliability make them essential tools for industrial and scientific applications. In addition, their adjustable wavelength (by choice of semiconductor material) enables their use as optical pumps for a wide rang...

Four wave mixing at 1550 nm in silicon waveguides

Gajda, Andrzej (2017)

Traffic in data communication networks has seen continuous growth over many decades. Taking the example of transport networks we observe a growth rate of about 60% per year in capacity. The increase in traffic is supported by various technologies but mainly driven by applications related to social media, moving images, internet of things etc. An important contender for future increase of fiber ...

Waveguide integrated MQW p-i-n photodiodes

Zhou, Gan (2017)

In this work, waveguide integrated multiple quantum well p-i-n photodiodes are developed and characterized. Compared to bulk photodiodes, multiple quantum well photodiodes have special properties including a large and tunable polarization dependent loss. It makes multiple quantum well photodiodes a potential candidate for various applications, especially in polarization-diversity coherent optic...

Fiber optical parametric amplifiers in optical communication systems

Marhic, Michel E. ; Andrekson, Peter A. ; Petropoulos, Periklis ; Radic, Stojan ; Peucheret, Christophe ; Jazayerifar, Mahmoud (2015)

The prospects for using fiber optical parametric amplifiers (OPAs) in optical communication systems are reviewed. Phase-insensitive amplifiers (PIAs) and phase-sensitive amplifiers (PSAs) are considered. Low-penalty amplification at/or near 1 Tb/s has been achieved, for both wavelength- and time-division multiplexed formats. High-quality mid-span spectral inversion has been demonstrated at 0.64...