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J. B. Kyle and R. W. Grow, “The Helically Wrapped Circular Waveguide,” IEEE Transactions on Electron Devices, Vol. 34. No. 8, 1987, pp. 1873-1884.

has been cited by the following article:

• TITLE: Effect of Helix Pitch Angle on the Modal Dispersion Characteristic of Step-Index Optical Fiber

  AUTHORS: Ashish Kumar Mishra, Deepak Kumar, Onkar Nanth Singh

  KEYWORDS: Modal Dispersion; Pitch Angle; Modal Cut-off

  JOURNAL NAME: Journal of Electromagnetic Analysis and Applications, Vol.4 No.7, July 23, 2012

  ABSTRACT: The general characteristic equation is derived for the helically cladded step-index optical fiber. The dispersion curves are drawn for the different pitch angles Ψ and mode order ν = 1. The effect of helix pitch angle on the dispersion characteristics and also on the modal cut-off condition is examined. Except for the lowest order mode, all the modes appear in pairs. The lowest order mode displays the negative dispersion for the some value of normalized frequency V and depends on the helix pitch angle Ψ.