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PhD scholarship in digital coherent receivers for mitigation of  optical fibre channel nonlinearities

Applications are invited for a 3-year PhD position within the field of coherent optical receivers for mitigation of optical fibre channel impairments. The start date is flexible, but preferably before September 1, 2013. The project is interdisciplinary and will cover topics within the field of digital signal processing, coding and optical communication. The project will be carried out at the Department of Photonics, Technical University of Denmark (DTU). The project is in collaboration with Stanford University, and an external research stay at Stanford University will be possible. The PhD-project is funded through Villum foundation Young Investigator Program.

Project description

In order to satisfy future demands on the data capacity, optical communication systems are experiencing a paradigm shift by moving to sophisticated modulation formats such as quadrature amplitude modulation (QAM). For higher order QAM signaling, optical fiber nonlinearities can severely limit the achievable transmission distance. Mitigation of optical fiber nonlinearities is therefore essential, as it will allow launching more power into the fiber and thereby enhancing the transmission distance. One approach of mitigating the nonlinearities is to implement sophisticated signal processing and channel estimation at the receiver. Another approach would be to focus on the transmitter side and investigate various pre-distortion techniques as well as different constellation shapes that would enable power constrained modulation.

The objective of the project is to investigate different digital signal processing based techniques (pre-distortion, constellation optimization, nonlinear channel estimation etc) which would provide resilience towards optical fiber channel nonlinearities for long haul optical communication systems. Most promising techniques will be incorporated and evaluated in an experimental test-bed environment.

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. Candidates with experience in digital communication, optical communication, machine learning, pattern recognition or some other related fields of signal processing are encouraged to apply.

     Moreover the candidate shall have additional skills as:

  • Ability to work independently, to plan and carry out complicated tasks, and to be a part of a large, dynamical group
  • Good communication skills in English, both written and spoken
  • Industrial experience is highly appreciated.  

Approval and Enrolment
The scholarships 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.

Salary and appointment terms
The salary and appointment terms are consistent with the current rules for PhD degree students. The period of employment is 3 years.

Further information
Further information may be obtained from Professor Knud J. Larsen, phone: +45 4525 3629 or Associate Professor Darko Zibar, phone: +45 25 65 81.

You can read more about Department of Photonics Engineering on

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