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ARROW-Like Concepts for Ultra-Compact Photonic Integrated Circuits Combining Hgh Cntrast Lw Ccontrast Waveguides


Fibre optics used to be exclusively employed for long distance communications, are penetrating into the local area network. The network will reach our homes before long. In order to manage the expected vast amount of data traffic, we need complex and highl y integrated optical circuits, i.e. transmitters, routers and multiplexers that are able to control many channels simultaneously. Photonic Integrated Circuits (PICs) that combine passive and active waveguide based devices on the same chip are widely consid ered the key devices for the massive deployment of photonic technologies in telecommunication. Nevertheless, a number of highly desired functions for all-optical networks are not easily implemented in a conventional PIC, and moreover, their size is too lar ge from a high integration point of view. The novel circuits that are being proposed are based on submicron high contrast waveguides, which will be scaled-down versions of "classical" waveguides or use 2-dimensional (2D) photonic bandgap structures for propagation control. These waveguides offer very tight confinement of light, being planned to be exploited to create ultracompact photonic circuit elements (ultra-compact bends, couplers, power splitters and combiners), wavelength selective devices and efficient nonlinear elements. However, the increase of refractive index contrast readily leads to two major issues: huge scattering loss and polarisation sensitivity. This is the reason why no reports yet of low-loss 2D photonic crystal based p lanar waveguides. Reports on photonic wire structures are also scarce. Therefore, the applicability of these structures is still far. The proposed project aims the on-chip combination of standard low contrast waveguides having very low losses with narrow h igh contrast waveguides allowing for sharp bends, compact couplers and splitters, etc. Furthermore, the project aims to demonstrate the potential of the ARROW (antiresonant reflecting opt#


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