Compensation of residual dispersion with tunable hybrid filter architecture
The increasing demand and the growing utilization of new services in the telecommunication field (e.g. video-on-demand, IP-TV and digital television) require a constant development in systems for communication purposes. The optical communication technology – with data rates of 100 GBit/s and above – is the only technique available today which can satisfy the increasing need for this high bandwidth. However, these high data rate transmissions call for stringent requirements of network components, due to the decreasing system tolerance for perturbation, e.g. dispersion (pulse distortion).
The static compensation of these dispersion effects, such as the implementation of dispersion compensating fibres (DCF), is limited. External influences (e.g. temperature fluctuation and modification in network topology) require an adaptive realization.
An electrical equalizer can only be realized with high expenses because its implementation has to fulfil coherent detection and has to be composed of electrical high-speed components. By contrast, the realization of capable optical equalizers, even for high data rates, is comparatively easy. These filter structures can be constructed as planar waveguides in SiON-technology.
Research activities at the department of High-Frequency Engineering focus on optical FIR-filter analysis for adaptive compensation of residual dispersion. In a hybrid approach, serial and parallel architectures are being combined and their adjustability and stability is being studied. Moreover, the project deals with the question whether the control of the filter setting allows for automatic adaptive compensation.
Ref. : Journal of Lightwave Technology, pp. 990-996, April 2012
Persons involved in this project:
Univ.-Prof. Dr.-Ing. C. G. Schäffer , Dipl.-Ing. Stefan Schwarz
Letzte Änderung: 27. September 2017