PhD position in AlGaAs Photonic Chips for 2 um Optical Communications

Updated: 3 months ago

Apply no later than 4 June 2017
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Optical communications is the backbone of our information society; however currently optical fiber transmission is approaching the capacity limit. This project aims to explore novel way using AlGaAs photonic chips for optical communications at a new wavelength region of 2 um, which is part of Villum young investigator program of energy-efficient optical communications at 2 micron beyond capacity crunch (2MAC).

The AlGaAs-on-insulator (AlGaAsOI) nano-waveguide, where a thin AlGaAs layer on top of a low index insulator layer resides on a semiconductor substrate, has recently emerged as an ultra-efficient nonlinear platform, since the AlGaAsOI nano-waveguide combines high intrinsic material nonlinearity with the large index contrast between AlGaAs and silica cladding. In addition, the bandgap of AlGaAs can be engineered by changing the Al concentration to avoid two-photon absorption at telecom wavelengths and reduce three-photon absorption at 2 um. The topic of AlGaAs photonic chip at 2 um is quite novel, leaving ample opportunity for this Ph.D. project to significantly push the state-of-the-art in research in this field.

The PhD project will be carried out in the High Speed Optical Communications group (HSOC) and Nanophotonic Devices group in the Department of Photonic Engineering at the Technical University of Denmark. The HSOC group is at the very forefront of international research in optical communication technology and holds a number of world records in ultra-high speed optical communication. There is access to state-of-the-art experimental facilities and cleanroom facilities. The two groups are highly international and encourage collaborative work and an informal working environment.

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

  • Design and fabrication of AlGaAsOI devices optimized for 2 um wavelength region.
  • Explore new functionalities for optical signal processing at 2 um using the AlGaAsOI devices.
  • Characterization and optimization of ultra-wide band optical nonlinear interaction in the AlGaAsOI nano-waveguide.
  • Demonstration and characterization of parametric amplification and wavelength conversion in the AlGaAsOI nano-waveguide with CW operation at 2 um.
  • Optical frequency comb generation or broadening in the AlGaAsOI ring resonator or nano-waveguide at 2 um. As part of the Danish PhD program, the student will follow a number of PhD 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 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 .   

The assessment of the applicants will be made by Senior Researcher Hao Hu, Associate Professor Michael Galili and Researcher Minhao Pu.   

We offer
We offer an interesting and challenging job in an international environment focusing on education, research, scientific advice and innovation, which contribute to enhancing the economy and improving social welfare. We strive for academic excellence, collegial respect and freedom tempered by responsibility. The Technical University of Denmark (DTU) is a leading technical university in northern Europe and benchmarks with the best universities in the world. 

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.

Workplace will be at DTU Fotonik, Department of Photonics Engineering, DTU Lyngby Campus. 

Further information
Further information may be obtained from Senior Researcher Hao Hu, .  

You can read more about DTU Fotonik on .   

Please submit your online application no later than June 4th , 2017. Applications must be submitted as one pdffile 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. 

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, bio-photonics, nano-optics and quantum photonics.   

DTU is a technical university providing internationally leading research, education, innovation and public service. Our staff of 5,800 advance science and technology to create innovative solutions that meet the demands of society; and our 10,600 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.

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