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New aspects in bandwidth measurements considering the effects of DMD |
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| Authors: | Christian-Alexander Bunge Winfried Lieber Dan Curticapean |
| Institution: | aTechnical University Berlin, Sekr. HFT-4, Einsteinufer 25, D-10587 Berlin, Germany;bUniversity of Applied Sciences Offenburg, Badstr. 24, D-77652 Offenburg, Germany;cLaboratoire des Systèmes Photoniques, École Nationale Supérieure de Physique de Strasbourg, Université Louis Pasteur, Strasbourg, Bd. S. Brant, F-67400 Illkirch-Graffenstaden, France |
| Abstract: | This paper focuses on the effects of differential mode delay (DMD) on the bandwidth of multimode optical fibres. First an analytical solution for the computation of the differential mode time delay is presented. The electrical field of each mode is calculated by the numerical solution of the Helmholtz equation. Based on this solution the modal power distribution as well as the fibre's impulse response under different launching conditions can be obtained.Next, the refractive-index profile of two fibres is modelled on the basis of DMD measurements. It is shown that these measurements provide enough information to predict the fibre's propagation characteristics under different launch conditions (excitation conditions). |
| Keywords: | Differential mode delay Bandwidth of multimode fibres Refractive-index profile Launching conditions |
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