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Investigation of influence of tilt angle on mode dispersion in step-index plastic optical fibers

Kovacevic M. S., Djordjevich A.

Opto-Electronics Review

2011

Vol. 19, No. 1

61-65

Effect of numerical aperture on mode dispersion and bandwidth is reported for commercially available step-index plastic optical fibers. For the first time, the functional relationship is given between dispersion and the "tilt-angle" describing the slant of the input/output face for a fiber terminated by a plane not perpendicular to the fiber axis. This tilt of a non-squarely terminated fiber may be intentional as in some biomedical spectroscopic sensors, or otherwise when exploiting the quick-interconnectivity potential of plastic fibers.

Light propagation in thermally expanded core fibers with graded-index

Kovacevic M. S., Djordjevich A., Nikezic D.

Optica Applicata

2009

Vol. 39, nr 2

267-276

Light propagation is analyzed in thermally expanded core (TEC) fibers with graded-index profile. Used as power mixers among others, their core structure at the boundary between the heated and non-heated regions is represented by linear taper. Ray optics is used as the transverse taper dimensions are large relative to the wavelength of propagating light. Trajectories of meridian rays are derived analytically. Numerical results presented show ray trajectories as functions of the position within the taper and taper slope. These are modulated sinusoidal functions whose amplitude and period rise with the taper radius. Both, bound and leaky rays have been examined.