"Simulation of Optical Phenomena in Step-index Fibers and Fiber-bundles," Application report for ASAP Educational License
Updated: Aug 12, 2014
Author(s): Andreas Ebbecke, Uwe Langbein
In panel-displays which are based on a fiber bundle technique, each "pixel" is illuminated by a slim fiber bundle, consisting of several dozens of single fibers. These individual fibers bundles are tightly packed and sealed together at their input end to form a fiber cable harness with a compact common input face ("super-bundle"), illuminated by a particular programmable projector. In this tightly packed "super-bundle," the single fibers belonging to different bundles are no longer well separated but glued in close proximity to one another. Under these circumstances, cross-talk between fibers belonging to different bundles is becoming a critical effect. For that reason, modeling of optical phenomena in fibers and fiber-bundles should provide some insight to the origin of the cross-talk effects observed in experiments.
In the Lab for Engineering Optics of the Fachhochschule Wiesbaden, University of Applied Sciences, led by Dr. Uwe Langbein, core competence in fiber analysis has been based so far on wave-optical simulation techniques that are not appropriate to the highly multimode fibers used in fiber harnesses. For that reason, the application of a suitable ray-optical simulation tool was in order. Such a tool should not only provide some more insight into those specific cross-talk effects, which have been the subject of my final thesis, but should deepen our understanding of optical phenomena in optical fibers in general from the point of view of ray optics. Our decision to use ASAP™ was based on the good reputation of this software system but also by the fact, that the project was partly performed in cooperation with SCHOTT Glass, a major global supplier of optical glasses, who uses ASAP too.