Monday, October 26th, 11 am (PDT) via Zoom
Fiber communications support a wide range of residential, mobile and enterprise services, within core, metro, and access optical networks. The 5G and beyond wireless is expected to have a dramatic impact on the fiber infrastructure, bringing new severe requirements such as higher data rates, ultra-high bandwidth, lower latency, accurate synchronization, network slicing, ultra-high reliability and massive connectivity for many devices. Adaptive, flexible and efficient optical resource management, as well as agile bit-rates are the key technologies to exploit the whole bandwidth of single-wavelength, single-core and single-mode fibers. All-optical orthogonal frequency division multiplexing (OFDM) and Nyquist-optical time division multiplexing (N-OTDM) are the two most suitable approaches to efficiently generate Tb/s superchannels, by optically multiplexing subcarriers or by time interleaving short sinc-shaped pulses. The superchannels are generated in the optical domain, in a power-efficient way, also overcoming the restrictions related to the bandwidth of modulators and digital signal processing devices. A planar arrayed waveguide grating (AWG) can be designed to implement the conventional or fractional Fourier transform and efficiently generate OFDM and Fr-OFDM superchannels, that are less sensitive to nonlinear distortion and chromatic dispersion effects. The ultimate efficiency in physical resource exploitation can be achieved only in a truly flexible system, where it is possible to switch from OFDM to N-OTDM and vice versa, through intermediate fractional grids. Starting from experimental results of a novel approach for hybrid time-frequency multiplexing, this talk will focus on additional multiplexing domains, such as polarization, space, wavelength and code. Suitable AWG configurations can be designed for simultaneous frequency and polarization or mode and frequency multiplexing, as well as for generating optical codes in asynchronous code division multiple access (CDMA) and optical packet switching systems.
Image from https://doi-org/0.1364/OE.25.00349
Gabriella Cincotti is a Full Professor at the Engineering Department, University Roma Tre, Rome Italy; she leads the Photonics Research Group and is in charge of the courses of Photonics and Biophotonics. She is a Fellow of the Optical Society of America (OSA), she was an elected member of the Board of Governors of the IEEE Photonics Society (2017-2019) and currently she is serving in the IEEE Photonics Publications Council. She was a technical program committee (TPC) member of the European Conference on Optical Communications (ECOC) (2010-2012), also serving as Chair of the Access Subcommittee. She was also TPC member of the Optical Fiber Communication Conference (OFC) (2016-2018). She served as an Associate Editor of Optics Letters (2008-2014) and she serves as Deputy Editor of Optica since 2017. She has authored or co-authored over 300 research papers in leading journals and conferences. Her main research interests are in the field of planar lightwave circuits, photonic devices and subsystems for high-speed optical signal processing. Recently, she moved part of her research interests toward super resolution imaging and point of care testing for biomedical and microbiological applications.
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