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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