IEEE Photonics Society

Boston Photonics Society Chapter

Boston Chapter of the IEEE Photonics Society


December 8, 2022
6 PM

Analog Devices Hubble Auditorium

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Multimode Fiber Optics: Recent Paradigm Shifts Driving its Resurgence

Prof. Siddharth Ramachandran, Boston University, Boston, MA


Prof. Siddharth Ramachandran, Boston University, Boston, MA

Abstract:  Multimode fibers theoretically support the transmission of photons in a variety of spatially, vectorially and topologically complex modes known to possess interesting linear and nonlinear properties. The large number of modes can also greatly aid energy-efficient information-capacity scaling for classical communications as well as high dimensionality for quantum networks. However, it has long been presumed that fiber-propagation mixes modes, destroying any uniquely exploitable attributes they may possess. This conventional wisdom has been upended in the last decade, due to advances in signal conditioning and reception technologies, as well as from new insights gained into the topological properties of photons. Here, we describe how this recently accessible degree of freedom for encoding information in a photon has impacted applications as disparate as quantum networks, energy-efficient internet architectures, bio-imaging, and laser power scaling.


Biography:  Siddharth Ramachandran started his career at Bell Labs, and after a decade in industrial research labs, returned to academia, where he is currently a Distinguished Professor of Engineering at Boston University. His work on the understanding and development of lightwave devices comprising spatial, vectorial and topological complexity have been applied in the fields of quantum computing, optical networks, brain imaging, as well as laser based defense systems. For his contributions, he has been named a Distinguished Member of Technical Staff at OFS (2003), a fellow of Optica (2010), IEEE (2019) and SPIE (2019), an IEEE Distinguished Lecturer (2013-2015), a Distinguished Visiting Fellow of the UK Royal Society of Engineering (2016), and a Vannevar Bush Faculty Fellow (2019). He serves the optics and photonics community in several capacities, including, currently, as a deputy editor for Optica.


This meeting begins at 7 PM Thursday, December 8th, 2022 and will be in person and online.  Prior to the seminar there will be social time and networking from 6:00 – 7:00PM. Food from Chipotle will be provided. The seminar will begin at 7:00PM.  Please register for either in-person or online.

Register if you plan to attend the seminar in-person:

Register if you plan to join the webinar by Zoom:

This webinar will take place on Zoom and will be started 30 minutes early (at 6:30 EDT) to allow for technical troubleshooting. The seminar will begin at 7:00PM. For more information contact Keisuke Kojima, IEEE Boston Photonics Society chair at, or visit the IEEE Boston Photonics Society website at


Location:  Analog Devices Hubble Auditorium

1 Analog Way

Wilmington, MA 01887

From Industrial Way entrance, follow signs for Visitor or Garage Parking, then follow signs for Main Entry which lead to the Hub Building - circular building at center of campus, visitor entrance is on the east side.  Meeting is located on the second floor in the Hubble Auditorium.

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