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Center for Astrophysics Research and Technologies Seminar Series Information


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High-Capacity Optical and Millimeter-Wave Communications using Multiple Orbital-Angular-Momentum Beams

Friday February 19, 2021
3:30 pm

 Presenter:  Alan Willner, USC
 Series:  Physics and Astronomy Colloquium
 Abstract:  Communications has historically experienced tremendous capacity growth by multiplexing many channels and transmitting them simultaneously. In this regard, space-division-multiplexing (SDM) as an exciting domain to exploit, and multiple spatially overlapping orthogonal modes can achieve a subset called mode-division-multiplexing (MDM). Indeed, the ability to multiplex multiple data-carrying modes over the same physical medium represents the potential for increasing system capacity and spectral efficiency.

Generating different amounts of orbital-angular-momentum (OAM) on different optical or millimeter-wave beams has emerged as a technique for such mode multiplexing in optical and radio communications. A beam can carry OAM if its phase front twists in a helical fashion as it propagates, and the amount of OAM corresponds to the number of 2*pi phase shifts that occur in the azimuthal direction. Each OAM beam is orthogonal to other beams, and such beams can be efficiently multiplexed, transmitted, and demultiplexed with little inherent crosstalk.

This presentation will explore the achievements of and challenges to OAM-based optical and millimeter-wave communication systems, including transmission, turbulence compensation, link design, causes and mitigation of modal crosstalk, and classical and quantum encoding.
 Host:  Mansoor Sheik-Bahae
 File/Video Recording:  https://web.microsoftstream.com/video/0182b7f1-4294-4f35-b8d3-3ec6cbbdb9db
 Location:  Via Zoom. Contact the department for password

Disability Notice Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact the Physics and Astronomy Department (phone: 505 277-2616, email: physics@unm.edu) well in advance to ensure your needs are accommodated. Event handouts can be provided in alternative accessible formats upon request. Please contact the Physics and Astronomy Department if you need written information in an alternative format.