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Special Student Training Session

Special Student Training Session


A student training session will take place on Tuesday 23rd August 2016, from 19:00 - 21:00. If you wish to attend the course, please contact the EPS Secretariat to, at the latest Tuesday 16th August 2016.



Dr Rüdiger Paschotta, RP Photonics Consulting GmbH
founder and managing director
Waldstr. 17
78073 Bad Dürrheim
Physical modeling in passive and active fiber optics
Both in passive and active fiber optics, physical modeling can be a powerful tool for accelerating and improving research and development. Essentially, such models allow one to simulate the detailed workings of devices in order to quantitatively analyze them, identify limiting factors and find optimum solutions while saving resources, compared with an experimental trial-and-error approach.
This course presents an overview on modeling in fiber optics. The first part treats passive fibers. It is explained what guides modes of fibers are and how their numerically calculated properties can be used for efficiently calculating light propagation in fibers. In other cases, numerical beam propagation methods, not referring to modes, are more appropriate and useful; for example, they can be used for studying the light propagation in fiber tapers and fiber couplers.
The second part of the course addresses light absorption and amplification in active (rare-earth-doped) optical fibers. It is explained how excitation densities can be calculated with simple rate equation systems, and how excitation densities are related to absorption and optical gain. For calculating self-consistent steady-state solutions (involving the distribution of optical powers and excitation densities) in fiber amplifiers and lasers, certain numerical methods are required, which are not trivial to implement if efficient computations involving many optical wavelength are required. Further, it is shown how such numerical models can be used to quantitatively analyze the operation characteristics and limitations of fiber amplifiers and lasers.
Finally, ultrashort pulse propagation in fibers is discussed, which is relevant for mode-locked fiber lasers as well as ultrafast fiber amplifiers. Here, effects of chromatic dispersion and fiber nonlinearities are very relevant. Examples are shown for the resulting nonlinear dynamics, and different regimes of operation of mode-locked fiber lasers are illustrated.
Due to various reasons – for example, high optical gains, strong optical nonlinearities and strong saturation effects concerning gain and absorption – the operation details of fiber lasers are often substantially more difficult to analyze than those of bulk lasers, making numerical simulations correspondingly more important, as otherwise it would be very hard to optimize devices and understand various limitations. On the other hand, fiber optics (particularly when based on a single-mode fibers) often leads to well-defined systems, where the predictive quality of numerical models can be high.




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