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4 March 2019 Crosstalk analysis in asymmetric directional coupler for MDM application
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Mode Division Multiplexing and De-multiplexing (MDMux / MDDeMux) has been considered a promising technique for increasing link capacity in optical interconnection. One of the most promising structures currently proposed for this application is the Asymmetric Directional Coupler ADC designed to match the propagation constant of the fundamental mode in one guide to that of the higher order modes of the adjacent guides in the coupler. Such an ADC has been used extensively in the literature to demonstrate the mode Mux for up to 16 modes in planar optical circuits. One of the key parameters in the design of such Mux / DeMux is the crosstalk (CT) due to the leakage of an undesired mode in a specific waveguide / channel. The evaluation of this parameter is usually done using numerical techniques such as the BPM or the FDTD. In this work, we apply the Coupled Mode Theory (CMT) on the ADC for the evaluation of the cross talk between guides. The results of the CMT are compared with those obtained by the 2D Beam Propagation Method, and a very good agreement is obtained. The CT is also calculated as a function of the wavelength and the location of the minimum is determined with accuracy better than 2.5 nm at the wavelength of 1550 nm. The developed CMT formulation allows very rapid structure optimization due to the great reduction in the design cycle.
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Amr Wageeh, Salwa El-Sabban, G. A. F. M. Khalaf , and Diaa Khalil "Crosstalk analysis in asymmetric directional coupler for MDM application ", Proc. SPIE 10921, Integrated Optics: Devices, Materials, and Technologies XXIII, 1092123 (4 March 2019);

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