17 February 2009 The design of signal processing devices employing SOI MMI couplers
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There is currently considerable research interest in all-optical signal processing for telecommunication applications. In this paper it is shown that a range of all-optical signal processing functions may be carried out using passive waveguides and phase-shifting elements as basic building blocks. Two types of multimode interference (MMI) photonic circuits, based on silicon-on-insulator (SOI) technology, are discussed in detail. In the first type, phase-shifting elements are added to the ports of MMI couplers. In the second type, the waveguide structure of the MMI coupler itself is modified to achieve a range of signal processing functions. Designs are verified using 2D and 3D simulations.
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Laurence W. Cahill, Thanh T. Le, "The design of signal processing devices employing SOI MMI couplers", Proc. SPIE 7220, Silicon Photonics IV, 722003 (17 February 2009); doi: 10.1117/12.809020; https://doi.org/10.1117/12.809020

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