The ever growing demands of bandwidth in optical communication systems are making traditional Wavelength Division Multiplexing (WDM) based systems to reach its limit. In order to cope with future bandwidth demand is necessary to use new levels of orthogonality, such as the waveguide mode or the polarization state. Mode Division Multiplexing (MDM) has recently attracted attention as a possible solution to increase aggregate bandwidth. In this work we discuss the proposition a of mode converter that can cover the whole C-Band of optical communications. The Mode Converter is based on two Multimode Interference (MMI) couplers and a phase shifter. Insertion loss (IL) below 0.2 dB and Extinction ratio (ER) higher than 20 dB in a broad bandwidth range of 1.5 μm to 1.6 μm have been estimated. The total length of the device is less than 30 μm.
Diego Perez-Galacho, Carlos Alberto Alonso-Ramos, Delphine Marris-Morini, Vladyslav Vakarin, Xavier Le Roux, Alejandro Ortega-Moñux, Juan Gonzalo Wangüemert-Perez, and Laurent Vivien, "Integrated mode converter for mode division multiplexing," Proc. SPIE 9891, Silicon Photonics and Photonic Integrated Circuits V, 98910B (Presented at SPIE Photonics Europe: April 04, 2016; Published: 13 May 2016); https://doi.org/10.1117/12.2228848.
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