Abstract
In this paper, the authors investigate analytically the transformation from the initial
guided mode distribution to the stationary state and the effects of the bidimensional
roughness profile, in multimode polymeric buried waveguides. In these structures, due to the
geometrical dimensions and the operating wavelength, about a thousands of guided modes can
propagate, even for weak core/cladding dielectric contrast. The coupling coefficients are
computed by exploiting the geometrical features of the optical channels, such as the waveguide
dimensions and the roughness surface statistics. The analysis gives insight on the
guided/guided and guided/radiated mode interaction, and higher order solution is proposed, in
the case of a great number of modes interacting over distances that are extremely long as
compared to the signal wavelength and the roughness correlation length. Experimental results
are valuated by means of semicontact atomic force microscopy as well as compared with existing
numerical models.
© 2010 IEEE
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