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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 31,
  • Issue 13,
  • pp. 2163-2169
  • (2013)

Tapered Velocity Mode-Selective Couplers

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Abstract

In this paper tapered velocity mode-selective couplers are presented. These tapered couplers are approximately adiabatic devices which unlike standard mode-selective couplers, do not rely on precise phase conditions to be satisfied over an extended length, to achieve their mode-selective functionality. Therefore these mode couplers permit ultra-wideband mode-division multiplexing of few-mode waveguides. Moreover, their behavior is largely independent of parameters such as index contrast and the precise coupler dimensions. The mode-selective functionality is demonstrated in slab geometry, with the principles generalizing to planar or fiber-based devices.

© 2013 IEEE

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