Skip to content  

Working at TU/e

PhD Position: High-speed directly modulated micro-lasers (V36.4268)

PhD Position: High-speed directly modulated micro-lasers

Department of Electrical Engineering
Date off
Reference number

Job description

Eindhoven University of Technology (TU/e) has the following PhD student vacancy for research on high-speed directly modulated micro-lasers, in the research group Photonic Integration (PhI) of the department of Electrical Engineering.

Job description
The photonic integrated circuits (PICs) are more and more important for datacenter applications, for their speed, scalability and producibility. The ever-increasing data capacity has pushed the development of multiplexing technologies with parallelized channels in a single chip to achieve >100G bit rate. However to meet future terabit rate, parallelization alone cannot keep up with the growth. The performance of the individual transmitter (most commonly the direct modulated lasers) needs to be enhanced significantly. VCSELs and DFB lasers have been typically used in direct modulation. But their 3dB modulation bandwidths are limited typically at about 25 GHz level. To break the bottleneck, we need a fresh look at the semiconductor laser design.

A photonic integration platform that combines wafer-scale indium phosphide with wafer scale silicon enables the creation of high-confinement photonic devices. This has been created as the result of several previous research projects, and continues to provide a platform for a number of new research lines. In this research project, the platform will be used to explore new device designs and realisations for directly modulated lasers.

This position will study the key technologies to enable micro-lasers on an InP membrane for high-speed direct modulation. The project will include device-level simulations (optical, electrical, thermal), device and circuit layout, process flow design, and device fabrication in the Nanolab@TUe cleanroom. Characterization of devices fabricated and analysis of results will also be undertaken. This project is in collaboration with Huawei Ipswich Research Center in UK. During the work, regular communications, technical discussions and advice from Huawei Ipswich Research Center are expected.

The team
The Institute for Photonic Integration (IPI) has five dynamic and ambitious research groups, which are closely cooperating: a systems group, a photonic integration technology group and three materials research groups. You will work in the Photonic Integration group (PhI) which has about 35 members, 20 of which are PhD students. The IPI (previously COBRA) is internationally leading on advanced InP-based Photonic Integrated Circuits technology. See The technology development and device realization will be supported by experienced technicians in our world-class cleanroom facilities at Nanolab@TU/e (

Job requirements

  • Masters degree in Applied Physics, Optical Science or Electrical Engineering
  • Affinity for photonic devices and circuits
  • Background in semiconductor devices and general knowledge about semiconductor physics, modelling and component design.
  • Experience with clean room microfabrication technology is of an advantage
  • Ability to work with experts from a broad range of scientific and technology backgrounds
  • Fluent spoken and written English

Conditions of employment

We offer you:

  • An exciting job in a dynamic work environment
  • The possibility to present your work at international conferences.
  • A full time appointment for four years at Eindhoven University of Technology (
  • The salary is in accordance with the Collective Labour Agreement of the Dutch Universities, increasing from € 2,325 per month initially, to € 2,972 in the fourth year.
  • An attractive package of fringe benefits, including end-of-year bonus (8,3% in December), an extra holiday allowance (8% in May), moving expenses and excellent sports facilities.

Information and application


Questions regarding the academic content of the position can be directed to dr. Yuqing Jiao (y.jiao[at] ) or prof. Kevin Williams (k.a.williams[at] 

More information on employment conditions can be found here:


If you are interested in this PhD student position, please proceed via the ‘apply now’ button. You must upload the following documents (PDF format only):

For your application, please upload:

  • a brief letter motivating your interest and suitability for the position,
  • a detailed curriculum vitae including research experience,
  • transcripts of academic records indicating courses taken (including grades),
  • half-page summary of your MSc thesis,
  • contact details of two relevant references (email, phone number).

Please bear in mind: you can only upload 5 PDF documents (up to 10 MB each).