Postdoc (3-year) on Frequency Modulated Continuous Wave (FMCW) Source based on Lithium Niobate on Insulator Photonics – DTU Electro

Electronics EngineeringPhotonicsPower Electronics
Aug 31, 2023 21:59:00 GMT+00:00
Apply Now
Online Application
Save 0


This postdoc project, which is tied to the Danmarks Frie Forskningsfond (DFF) “Fully integrated 4D LiDAR on a Lithium Niobate photonic chip (LiDAR-on-a-chip)” project, will investigate Integrated FMCW laser on the Lithium Niobate on Insulator (LNOI) platform aiming for a 15-GHz modulation range and a >1 MHz tuning rate.Light detection and ranging (LiDAR), a sensing technology based on laser light, holds great promise for allowing autonomous machines to see and navigate the world with very high precision. “LiDAR-on-a-chip” describes a system with the lasers, electronics, detectors, and optical beam-steering mechanism all integrated onto semiconductor chips. It significantly reduces the size, weight, and power requirements by integrating all of the key components onto the smallest footprint possible. One of the key components that enables both distance and velocity sensing is frequency modulated continuous wave (FMCW) source, which can be realized by cascading a distributed feedback (DFB) laser source with a tunable high-Q resonator for lasing mode selection. In LiDAR systems, the frequency modulation typically needs to be 15 GHz with fast tuning rate of more than MHz to achieve a high resolution. However, none of the state-of-the-art solutions is able to meet the requirement, either limited by the tuning rate or limited by the frequency modulation range.This postdoc project, which is tied to the Danmarks Frie Forskningsfond (DFF) “Fully integrated 4D LiDAR on a Lithium Niobate photonic chip (LiDAR-on-a-chip)” project, will investigate Integrated FMCW laser on the Lithium Niobate on Insulator (LNOI) platform aiming for a 15-GHz modulation range and a >1 MHz tuning rate. The postdoc will design and fabricate high-Q microring resonators on LNOI for FMCW lasing mode selection. Coupled tunable microring resonator with different geometry will be designed to significantly improve the frequency modulation range. The postdoc is also going to investigate transfer-printing process to introduce the DFB laser on the LNOI platform. The optimized design will be fabricated in our state-of-the-art cleanroom DTU Nanolabs (Nationalt Center for Nanofabrikation og -karakterisering). The controlling circuits will be developed to control the fabricated FMCW laser. The end goal is to achieve a FMCW laser with the III-V material based DFB and high-Q microring resonator on the LNOI platform.The Postdoc project will be tied to the High Speed Optical Communications group (HSOC) at the Department of Electrical and Photonics Engineering at the Technical University of Denmark (DTU Electro). The HSOC group is at the very forefront of international research in LiDAR systems and high-capacity and energy efficient optical communications technology, and holds a number of world records within silicon photonics and ultra-high speed optical communication. The HSOC group is at a highly international level, encourages collaborative work, and offers an informal working environment. The project will have access to on-site and state-of-the-art experimental and cleanroom facilities.

Responsibilities and qualifications 

This Postdoc position will be part of the DFF LiDAR-on-a-chip project and will target experimental and theoretical investigation of the topics below:  

  • Design of low-loss, high-speed and widely electro-optical tunable lithium niobate high-Q resonators using push-pull mode
  • Investigation of coupled tunable microring resonator with different geometry to significantly improve the frequency modulation range
  • Investigation of micro-transfer printing of DFB laser on the LNOI platform
  • Fabrication and characterization of the designed LNOI high-Q resonators. 
  • Characterization and development of FMCW ranging technique with the fabricated LNOI high-Q resonator and off-chip DFB laser sources.
  • Characterization and development of FMCW ranging technique with the LNOI high-Q resonator and DFB laser source on the same chip.

The exact research activities will be continuously adapted to ensure high relevance and impact.As a formal qualification, you must hold a PhD degree (or equivalent).The successful candidate is expected to have experience and expertise in one or more of the following subjects:    

  • Experienced in nanofabrication. 
  • Experienced in integrated photonics.
  • Self-motivation in scientific research.
  • Good communication skills in English, both written and spoken.

Preferred qualifications and experience:

  • Experienced in lithium niobate photonics
  • Experienced in design of electro-optical modulators
  • Experienced in design of micro-resonators
  • Experienced in ebeam lithography based nanofabrication
  • Experienced in design and characterization of waveguides and modulators
  • Experienced in characterization and controlling of integrated lasers
  • Experienced in ranging techniques

We offer

DTU is a leading technical university globally recognized for the excellence of its research, education, innovation and scientific advice. We offer a rewarding and challenging job in an international environment. We strive for academic excellence in an environment characterized by collegial respect and academic freedom tempered by responsibility. 

Salary and appointment terms

The appointment will be based on the collective agreement with the Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 36 months.

The place of work is DTU Electro, Ørsteds Plads, Building 340, DK-2800 Kongens Lyngby, Denmark. 

Further information 

Further information may be obtained from Senior Researcher Yunhong Ding and Senior Researcher Hao Hu can read more about DTU Electro on If you are applying from abroad, you may find useful information on working in Denmark and at DTU at DTU – Moving to Denmark.

Application procedure

Your complete online application must be submitted no later than 31 August 2023 (Danish time). Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link “Apply now”, fill out the online application form, and attach all your materials in English in one PDF file. The file must include:

  • Application (cover letter)
  • CV
  • Academic Diplomas (MSc/PhD – in English)
  • List of publications 

Applications received after the deadline will not be considered.

All interested candidates irrespective of age, gender, disability, race, religion or ethnic background are encouraged to apply.

DTU Electro has more than 300 employees with competences in electrical and photonics engineering. Research is performed within nanophotonics, lasers, quantum photonics, optical sensors, LEDs, photovoltaics, ultra-high speed optical transmission systems, bio-photonics, acoustics, power electronics, robotics, and autonomous systems.

Technology for people

DTU develops technology for people. With our international elite research and study programmes, we are helping to create a better world and to solve the global challenges formulated in the UN’s 17 Sustainable Development Goals. Hans Christian Ørsted founded DTU in 1829 with a clear mission to develop and create value using science and engineering to benefit society. That mission lives on today. DTU has 13,500 students and 6,000 employees. We work in an international atmosphere and have an inclusive, evolving, and informal working environment. DTU has campuses in all parts of Denmark and in Greenland, and we collaborate with the best universities around the world.