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Analysis of fiber-chip coupling for general high-index contrast waveguides

: Wächter, C.A.; Michaelis, D.


Armitage, J.C. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Applications of photonic technology: Closing the gap between theory, development, and application. Vol.1 : 7C-Photonics North 2004: Photonic applications in telecommunications, sensors, software, and lasers ; [International Conference on Applications of Photonic Technology (ICAPT)
Bellingham/Wash.: SPIE, 2004 (SPIE Proceedings Series 5579)
ISBN: 0-8194-5528-8
International Conference on Applications of Photonics Technology (ICAPT) <2004, Ottawa>
Conference Paper
Fraunhofer IOF ()

Current software simulation tools in integrated optics allow to tackle directly a multitude of complex problems which occur in high index contrast waveguiding. Appropriate eigenmode solvers and propagation schemes account for the vectorial character of the fields, and transmissive and reflective device properties can be derived. For the fibre-chip coupling of high index contrast waveguides the field matching requires to decrease the mode diameter by more than an order of magnitude. If photonic crystal waveguides are considered, the match of impedance and phase additionally call for attention. Generalized coupling integrals based on the modes at both sides of an interface take all these effects into account. This allows for an efficient analysis of conventional waveguide to photonic crystal waveguide interfaces. Moreover, free-space to waveguide coupling can be analysed as well, if an appropriate field transfer from vectorial ray-trace to wave propagation is implemented. Thus, the design of hybrid mode transforming optics for fibre-chip coupling including micro-lenses and integrated waveguide taper structures can be addressed.