Move aside electrons! Photons are coming! A tiny silicon photonic chip can topple the state-of-the-art electronics in terms of energy-efficiency and is a way to go for future 5G networks

PhD defence, Thursday 20 September 2018, Hakimeh Mohammadhosseini.

2018.09.20 | Olivia Elsebeth Belling-Nami

Hakimeh Mohammadhosseini

The microscope image of the tiny 2.5 by 2.5 mm2 silicon photonic chip under the test. Two optical fibers with 125-µm diameter are used to couple the light in and out the chip. The RF probe with three needles is landed on the chip to modulate the light with 10 GHz for generation of a high-speed 20 GHz signal.

During her studies, Hakimeh researched the energy-efficiency of a tiny silicon photonic chip, which can generate a high frequency of 30 GHz. High frequency bands can enable superfast 5G networks with 10 to 20 times faster data speeds. Hakimeh studied what this silicon photonic technology can bring for future 5G networks in terms of energy-efficiency and showed that photonics can beat electronics for efficient high frequency signal generation.  

The new research findings contribute to the next generation of mobile networks where many of the efficient tiny optical chips can be placed in each 10 – 200 m, and in this way we will not face any data breakdown in our mobile phone anymore, nor in places with lots of mobile users.

The PhD degree was completed at the Department of Engineering, Aarhus University.

This résumé was prepared by the PhD student.

Time: Thursday 20 September 2018 at 13:00
Place: Building 5125, room 120, Edison building, Department of Engineering, Aarhus University, Finlandsgade 22, 8200 Aarhus N
Title of PhD thesis: A silicon-photonic-based-transmitter for energy-efficient microwave generation
Contact information: Hakimeh Mohammadhosseini, e-mail:, tel.: +32 493690449
Members of the assessment committee:
Professor Guillermo Carpintero, Department of Electronics Technology, University Carlos III of Madrid, Spain
Associate Professor Haiyan Ou, Department of Photonics Engineering, Technical University of Denmark (DTU), Denmark
Professor Preben Kidmose (chair), Department of Engineering, Aarhus University, Denmark
Main supervisor:
Associate Professor Martijn Heck, Department of Engineering , Aarhus University
Language: The PhD dissertation will be defended in English

The defence is public.
The PhD thesis is available for reading at the Graduate School of Science and Technology/GSST, Ny Munkegade 120, building 1520, rooms 128-134, 8000 Aarhus C.


PhD defence
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Olivia Elsebeth Belling-Nami

Revised 21.09.2018