Abstract
Selective excitation of circular helical modes in power-law index fibers is shown to have an impact on their capacity. This is analyzed using a model for propagation delay variation with launch offset and angle that resulted from misalignment of source and fiber axis. Results show promising technique to improve power law-index fibers capacities.
Highlights
It is a fact that when the bandwidth demand increased by the high bandwidth applications required from communication networks, the capacity of the already installed thousands of kilometers of multimode fibers (MMF) will be a bottleneck by Raddatz (1998, 1999), Coleman (2006), Gu (2006) and McInally (2002)
Helical modes are the type of modes that propagate in a helix shape inside the core of the fiber along the longitudinal direction that do not cross the fiber axis and bounded by the total internal reflection inside the core of the fiber by Murshid (2008)
In this paper a computer model for propagation delay in graded index fibers was used to quantify the impact of selective excitation of circular helical modes only on link performance
Summary
It is a fact that when the bandwidth demand increased by the high bandwidth applications required from communication networks, the capacity of the already installed thousands of kilometers of multimode fibers (MMF) will be a bottleneck by Raddatz (1998, 1999), Coleman (2006), Gu (2006) and McInally (2002). If the launch condition makes perfect alignment between source and fiber axis, what is so called meridional modes will only be excited. Meridional modes are the propagation modes that follow a path cross the fiber axis. If there is misalignment in both angle and offset between the source and the fiber axis what is called helical modes of propagation will be excited. Low angle, on-axis power excites a selection of low-order modes which can result in excessive and unstable pulse broadening relative to over filled launch conditions by Sargent (1998). In this paper a computer model for propagation delay in graded index fibers was used to quantify the impact of selective excitation of circular helical modes only on link performance
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