PhD position on Optical Time-Lenses for Passive Optical Networks

DTU Fotonik
Wednesday 07 Mar 18

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This project aims to advance the state of the art in time-lens based technologies for high capacity optical access networks and utilize their potential for energy-efficiency. This will be done by developing novel optical processing units and schemes, developing linear/nonlinear components optimized for broadband applications and developing advanced sub-systems based on optical time lenses. The project will explore novel ways of using integrated optical circuits for ultrahigh capacity energy-efficient optical access networks beyond the ‘techno barriers’, and finally demonstrate 10 times more capacity and orders of magnitude more energy efficient systems. 

Project description
A new highly flexible and scalable optical line terminal (OLT) structure based on time lens optical Fourier transformation (OFT) will be explored for optical access networks. The work will hold a theoretical and experimental part. The theoretical part will involve the development and simulation of novel principles for the Lens-PON system. Here, a physical understanding of non-linear optics will be required, with focus on the Kerr non-linearity in glass fibers and associated effects such as cross-phase modulation, self-phase modulation, four-wave mixing and parametric amplification. The experimental part will include extensive system characterizations of the developed Lens-PON system. In this process, the candidates will acquire a solid experience in optical communication systems.

This PhD position will investigate the research topics below using both experimental and theoretical methods, but not limited to these topics: 

  • Evaluate theoretically achievable transmission capacity, distance, subscriber count and energy efficiency of the proposed Lens-PON system.
  • Model the time-lens processer for Lens-PON.
  • Develop an understanding of the relation between time-lens properties and the performance of the Lens-PON.
  • Investigate MAC schemes on timing and wavelength control for robust Lens-PON system.
  • Design and optimize fiber based time-lens signal processor.
  • Demonstrate Lens-PON system experimentally.

As part of the Danish PhD program, the student will follow a number of Ph.D. courses as well as take part in teaching. Furthermore, there will be the opportunity to carry out a longer external research stay. We have close collaborations with numerous internationally leading universities and research organizations.

Candidates should have a master's degree in engineering or a similar degree with an academic level equivalent to the master's degree in engineering.

Approval and Enrolment
The scholarship for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programmes of DTU. For information about the general requirements for enrolment and the general planning of the scholarship studies, please see the DTU PhD Guide.  

The assessment of the applicants will be made by Researcher Pengyu Guan and Professor Leif Katsuo Oxenløwe.

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 an academic freedom tempered by responsibility.

Salary and appointment terms
The appointment will be based on the collective agreement with the Danish Confederation of Professional Associations. The allowance will be agreed with the relevant union. The period of employment is 3 years.

Supervisors and further information
Further information may be obtained from researcher Pengyu Guan,

You can read more about DTU Fotonik on   

Application procedure
Please submit your online application no later than 10 May 2018 (local time). Applications must be submitted as one PDF file containing all materials to be given consideration. To apply, please open the link "Apply online", fill in the online application form, and attach all your materials in English in one PDF file. The file must include: 

  • A letter motivating the application (cover letter)
  • Curriculum vitae
  • Grade transcripts and BSc/MSc diploma
  • Excel sheet with translation of grades to the Danish grading system (see guidelines and excel spreadsheet here)

Candidates may apply prior to ob­tai­ning their master's degree, but cannot begin before having received it.

Applications and enclosures received after the deadline will not be considered.

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

DTU Fotonik has 210 employees with competences in optics and is one of the largest centers in the world based solely on research in photonics. Research is performed within optical sensors, lasers, LEDs, photovoltaics, ultra-high speed optical transmission systems, communication technology, bio-photonics, nano-optics and quantum photonics.

DTU is a technical university providing internationally leading research, education, innovation and scientific advice. Our staff of 5,800 advance science and technology to create innovative solutions that meet the demands of society; and our 11,000 students are being educated to address the technological challenges of the future. DTU is an independent academic university collaborating globally with business, industry, government, and public agencies.