Pathak, Shibnath

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Ghent University Academic Bibliography

Simulation Tools for Silicon PhotonicsArrayed Waveguide Gratings.Shibnath PathakSupervisor(s): Dries Van Thourhout, Wim BogaertsI. INTRODUCTIONAn Arrayed Waveguide Grating(AWG) isone of the vital components in Wavelength Di-vision Multiplexing (WDM) systems. They areused to separate the many wavelength channelsin to different waveguides (or vice versa, mergethem). It consists of two free propagation re-gions (star coupler) and an array of waveg-uides with a linear increment of length. FigureI shows schematic diagram of an 8X200 GHzAWG. A light beam enters into the input starcoupler and is distributed over the array waveg-uides. The different wavelengths reaches thesecond star coupler with different phase shift.Because of this, wavelengths emerging fromthe array waveguides interfere in the outputstar coupler to focus at different output posi-tion.Figure 1. Schematic diagram of an 8X400 GHzAWG.For WDM systems, a flat passband forthe different wavelength channels is desirable.This can be achieved by placing a Multi ModeInterference(MMI) at end of the input aperture.The length and width of the MMI are chosen—————————————————–S. Pathak is with Photonics Research Group (IN-TEC), Ghent University - imecsuch a way that it produce a flattop pattern atthe output of the AWG[1].II. RESULTWe have developed a simulation frame-work which is fully integrated with our de-sign framework. All the components in this li-brary are parametrized cells (P Cells) enrichedby mixins. Our approach is to calculate thetransmission matrices(T matrix) of all the partsof the AWG and multiply to get the T matrixof the entire AWG. We compare the simula-tion result(Figure 2(a)) with our measurementresult (Figure 2(b)), for an MMI-input AWGwith identical designs.Figure 2. (a) Measurement result and (b)Simulationresult of a MMI-input AWG.III. CONCLUSIONSThe results of our semi-analytical model arevery similar to the experimental results. Thisallows us to use a cyclic work flow between de-sign, simulation and fabrication for improvedthe AWG.REFERENCES[1] M. K. Smit,et al, IEEE Journal of Selected Topicsin Quantum Electronics, 2(2), June 1996.

Simulation tools for silicon photonics arrayed waveguide gratings

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Simulation tools for silicon photonics arrayed waveguide gratings

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Ghent University Academic Bibliography