Speaker: Dieter Bimberg, CAS at CIOMP & Technical University of Berlin

Time: 20:00-21:30 p.m., May 19, 2023, GMT+8

Venue: Long press to identify the QR code and jump to the webpage!


Abstract:

Since 2014 novel consumer applications like Netflix, Block Chain,… not known to appear at the horizon at that time have led to a huge increase of internet traffic of 60%/year, much more than then originally predicted by companies like Cisco. This increased use of the internet is increasing its electrical power consumption due to increased data traffic mostly inside data centers. New data centers have crossed the 500 MW level. 5G with its big jump in data speed will be another enabler for new services, like LIDAR and more we cannot think about yet, and will increase the energy consumption to an extent not further tolerable. More research has to be done on the energy-efficiency of data traffic on all hierarchy levels.

Inside data centers advanced design of active optical cables, their electronic driver and receiver circuits and the active photonic devices are suddenly in the focus, with the goal to minimize their combined power consumption. Vertical-cavity surface-emitting lasers (VCSELs) for 200+ Gbit/s single fiber data transmission across OM5 multimode fiber with a record heat to bit rate ratio (HBR) of only 240 fJ/bit x wavelength @ 50Gbit/s developed in our labs are presented.

We recently discovered photon lifetime management to be the key to adopt the overall energy consumption to the bit rate of the data traffic (e.g. 25 Gb/s, 50 Gb/s,..). Completely novel GaAs VCSEL designs based on oxidizing apertures from dry etched holes filled subsequently with metal are presented.  Much better heat dissipation leads to much larger saturation currents, larger output power and larger 3 dB cut-off frequencies. Single mode multiplexing and easy polarized emission is enabled. The novel approach is covered by multiple worldwide patents.

Biography:

Dieter Bimberg received the Ph.D. magna cum laude from Goethe University, Frankfurt, Germany. He held a Principal Scientist position at the Max Planck-Institute for Solid State Research, Grenoble, France, until 1979. After serving as a Professor of electrical engineering, Technical University of Aachen, Germany, he assumed the Chair of Applied Solid-State Physics at Technical University of Berlin. He is the Founding Director of its Center of Nanophotonics. He hold guest professorships at the Technion, Haifa, U.C. Santa Barbara, CA, USA, and at Hewlett-Packard in Palo Alto, CA. He was Distinguished Adjunct Professor at KAU, Jeddah 2012-2018. In 2018 he assumed the directorship of the “Bimberg Chinese German Center for Green Photonics” of the Chinese Academy of Sciences at CIOMP, Changchun.

He is a member of the German Academy of Sciences Leopoldina, the EU Academy of Sciences, a Foreign Member of the Russian Academy of Sciences, the US Academies of Engineering and of Inventors, a Life Fellow of the American Physical Society and the Institute of Electrical and Electronics Engineers, IEEE, and a fellow of Chinese Optical Society. He is recipient of multiple international awards, like the UNESCO Nanoscience Award, the Max-Born Award and Medal of IoP and DPG, the Heinrich-Welker-Award, the Nick Holonyak Jr. Award, the Oyo Buturi and MOC Awards of the Japanese Society of Applied Physics, the Jun-Ichi Nishizawa Medal and Award of IEEE, and the Stern-Gerlach Award of DPG, to mention a few. He received honorary doctorates of the University of Lancaster, UK, and the St. Petersburg University of the Russian Academy of Sciences.

He has authored more than 1500 papers, 71 patents and present applications, and six books. The number of times his research works has been cited exceeds 67,000 and his Hirsch factor is 113. His research interests include physics and technology of nanostructures, nanostructured photonic and electronic devices, and energy efficient data communication.

Source: iCANX