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We have shown that many of these lasers can be replaced by a single optical light source that emits a full rainbow spectrum of colours - and that each colour can act as its own “mini-laser”. In other words: one light source can do the job of many, making communication systems far more energy-efficient.
This is exactly the technology we are developing. And as a PhD student, you will play a key role in turning this concept into reality.
What will you be working on?
You will join an international research environment developing new ways of transmitting data - more energy-efficiently, more scalably, and with fewer active components.
Your main responsibilities include:
- Working on a project that combines photonics, modelling, chip design and hands-on experiments - in a field that is advancing rapidly.
- Contributing both independently and as part of a close-knit team where we support each other, share ideas, and lift the projects together.
- Being an active part of the group’s scientific and social community, where humour, curiosity, and good collaboration are part of everyday life.
- Collaborating with researchers, industry partners, and fellow PhD students in a team of around eight people.
- Participating in international research environments, including a planned 3–6 month research stay abroad.
How your time is typically divided:
- 2/3 research – your project, your models, your experiments.
- 1/6 teaching – e.g., exercises, supervision, or course assistance.
- 1/6 other activities – conferences, courses, group collaboration, social networks, and building strong collegial relations
The technical corner
If you already know exactly what “optical modulators operating at low SNR in spatially data-distributed links” means, you’re going to enjoy this.
If you don’t - even better, because that is exactly what you will learn here.
You must have a two-year master's degree (120 ECTS points) or a similar degree with an academic level, equivalent to a two-year master's degree, before starting the project. It may be within physics, mathematics, electrical engineering, optical communications, fibre optics, coding, or integrated photonics/nanofabrication - but whatever your background, you don’t need to know the field in depth yet. You will learn everything you need during the project.
Approval and Enrolment
The scholarship for the PhD degree is subject to academic approval, and the candidate will be enrolled in one of the general degree programmes at DTU. For information about our enrolment requirements and the general planning of the PhD study programme, please see the Rules for the PhD proramme at DTU
.
The core of your PhD project is to exploit optical frequency combs - light sources that emit a full spectrum of colours at once - and design the components that can modulate each colour’s data signal as energy-efficiently as possible.
Here are some of the concrete technical tasks you will work on:
Design and modelling
- Learning to use chip-design software to develop optical data modulators that are:
– energy-efficient
– as simple as possible
– stand-alone or co-integrated with other components
– capable of operating at low signal-to-noise ratios (low SNR)
– flexible in terms of modulation formats and coding
Experiments and characterisation
- Testing and characterising your modulators in real communication setups, such as:
– space-division multiplexed (SDM) fibre transmission systems
– data-centre scenarios
– unrepeatered data-distributed links
Modulation formats
- Discovering which modulation formats actually work best when transmitting data over… yes… a rainbow of optical colours.
- Experimenting with how to achieve maximum data capacity with minimum energy.
And don’t worry:
You are not expected to understand all of this yet - but if this sounds exciting, you’re exactly the kind of candidate we’re looking for.
What do 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.
At DTU Electro, you get access to world-class laboratories - but also something equally important: a workplace that genuinely cares about people.
You’ll have close supervision and mentoring from senior researchers, and a group that works together rather than in silos.
We offer:
- An open, helpful, and humorous research environment where you can ask about anything - scientific or practical.
- A culture built on respect, good manners, and a strong desire to collaborate.
- Realistic expectations, clear support, and solid scientific supervision.
- A workplace where you can conduct serious research and still enjoy yourself.
- Colleagues who help you build a strong research career - both during and after your PhD.
- DTU supports you before, during, and after parental leave, ensuring a smooth return so your research can continue to grow. As a public-sector employee in Denmark, you are entitled to paid parental leave under Danish legislation and collective agreements, providing up to 48 weeks of benefits after childbirth. The High-Speed Optical Communications group also offers extra support for young researchers, including help with maintaining research progress and preparing potential grant applications.
The employment will follow the collective agreement with the Danish Confederation of Professional Associations, which includes a seniority-based PhD salary of approx. DKK 32,000 per month. Any allowances will be agreed with the relevant union.
Apply without CV and cover letter - it only takes 20 minutes!
We use Caseflow for this recruitment, ensuring a fair and structured process that focuses only on your competences and motivation - nothing else.
That means you don’t have to submit a traditional CV or application. Instead, you simply answer a few questions about the job - and you’re already closer to an interview!
Click here to get started.
(This is the only valid way to apply. Applications submitted through the DTU “Apply now” button cannot be accepted.)
When you click, you’ll be asked to enter your email, and then a code will be sent to you.
Practical information
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 upon with the relevant union. The period of employment is 3 years.
Employment:
Full-time (3-year PhD position).
Start date:
01 May 2026 or as soon as possible thereafter.
Deadline:
April 2, 2026.
You may apply prior to obtaining your master's degree but cannot begin before having received it.
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. As DTU works with research in critical technology, which is subject to special rules for security and export control, open-source background checks may be conducted on qualified candidates for the position.
Please note that applications must be submitted through
Caseflow using the link above
. Do NOT use the “Ansøg nu” button below, as applications submitted through that button will
not
be included in the assessment.
Applications are reviewed on a rolling basis, and we therefore encourage early submission.
More info & questions?
If you have questions, you are welcome to contact Professor Leif Katsuo Oxenløwe at 45 26353928 or lkox@fotonik.dtu.dk
For questions about the recruitment process, feel free to contact Chandra Schilling at 45 60910096 or cschi@dtu.dk
You are also very welcome to drop by for a chat - we’re always happy to offer you a cup of coffee.
For information about our enrolment requirements and the general planning of the PhD study programme, please see DTU's rules for the PhD education
. You can read more about career paths at DTU here
.
If you are applying from abroad, you may find useful information on working in Denmark and at DTU – Moving to Denmark
. Furthermore, you have the option of joining our monthly free seminar “PhD relocation to Denmark and startup “Zoom” seminar
” for all questions regarding the practical matters of moving to Denmark and working as a PhD at DTU.
About DTU Electro
DTU Electro is one of the world’s largest research environments in photonics and electronics, with around 320 employees
. We conduct research in everything from quantum photonics, nano-optics, and optical sensors to high-speed optical communications, robotics, and high-power electronics.
You will join the High-Speed Optical Communications Group (HSOC)
- an international, welcoming, and collaborative team where high scientific ambition goes hand in hand with helpfulness, humour, and academic kindness. Researchers and PhD students work closely together to develop the next generation of energy-efficient and sustainable communication technologies - from optical frequency combs and new modulator designs to communication links that operate at low signal-to-noise ratios.
The group consists of around eight people and is part of a larger international network of academic and industrial partners. You will have access to advanced laboratories, state-of-the-art equipment, and colleagues who share knowledge generously, offer support, and help you move forward when something (inevitably) becomes challenging in the research process.
DTU has more than 13,500 students and 6,000 employees and is founded on a mission to develop technology for the benefit of humanity. Here, you will find academic freedom, strong communities, and the opportunity to shape your research career in a globally recognised environment.
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.
IMPORTANT:
Please do NOT use the “Apply now” button on this page.
DTU’s website automatically shows an “Apply now” button, but this button does not apply to this position. To make sure your application is received, please use this Caseflow link to proceed
(read more about the application process above).
Brænder du for økonomistyring og data? Trives du med at arbejde selvstændigt i et fagligt stærkt miljø? Vil du være med til at understøtte fremtidens universitetscampus ved at sikre korrekt rapportering og bidrage til beslutningsgrundlag for DTU´s ledelse?
Så er du måske vores kommende kollega!
DTU er et teknisk eliteuniversitet med fokus på innovation og bæredygtighed og nu søger vi en erfaren Financial Controller til Koncernøkonomi, som er en del af Afdelingen for Økonomi og Regnskab. Du bliver en del af et mindre controllerteam i Budget og Rapportering, som sammen arbejder med den konsoliderede rapportering til direktion og bestyrelse. Teamet består også af to kompetencecentre for henholdsvis anlægsinvesteringer samt projektøkonomi for campusdrift og udvikling af DTU´s infrastruktur.
Om stillingen
Som Financial Controller bliver du en nøgleperson i konsolideringen af DTU´s projekter og enhedsregnskaber. Du får ansvar for spændende og udfordrende opgaver i en dynamisk stilling med store muligheder for både faglig og personlig udvikling i en opgavemæssig afvekslende hverdag. Vores opgave er at være med til at sikre en sund drift, en god likviditet og en solid balance.
Digitalisering, AI og effektivitet er nøgleordene i 2026, og derfor kræver stillingen, at det er naturligt for dig at tænke i nye processer og værktøjer for at være med til at skabe fremtidens økonomiafdeling på DTU.
Du refererer til sektionslederen for Budget og Rapportering, og dine primære opgaver bliver i tæt samarbejde med en erfaren kollega:
- Medvirke til konsolidering og controlling af kvartalsregnskaber, budgetter og årsrapport for DTU; herunder koordinering af balanceposter og stillingtagen til pengestrømme.
- Udarbejde og opdatere procesbeskrivelser og vejledninger samt lave udkast til ledelsesindstillinger.
- Udarbejde ledelsesrapportering til direktion og bestyrelse.
- Vidensdeling og sparring med kolleger i hele økonomiafdelingen samt være en supportfunktion for forespørgsler og analyser i en bred kontekst.
- Teamet har et tæt samarbejde med de andre afdelinger i økonomiafdelingen: Enhedsøkonomi, Projektøkonomi og Koncernindkøb samt andre enheder på DTU.
- Medvirke til optimering og forbedring af økonomiprocesser gennem digitalisering og AI.
Hvem er du?
Vi forestiller os, at du har en relevant økonomisk uddannelse og en del erfaring med konsolidering, rapportering og controlling på koncernniveau. Du arbejder struktureret, er proaktiv og går forrest, når opgaver skal løses. Hvis du har erfaring med Excel på højt niveau og kendskab til eller interesse for udvikling og implementering af IT-systemer, er det en klar fordel. DTU anvender Oracle som ERP-system.
Herudover har du evnen til at analysere data og omsætte dem til indsigt, der understøtter beslutninger og optimerer processer. Derudover er du en tydelig og samarbejdsorienteret kommunikator, som kan formidle informationer præcist og letforståeligt på dansk i både skrift og tale. Du lægger vægt på at trives både i faglige og menneskelige relationer med kolleger og samarbejdspartnere
Hvad tilbyder vi dig
- En arbejdsplads i konstant udvikling, hvor du har mulighed for at påvirke tiltag og processer.
- Stor fleksibilitet i tilrettelæggelsen af dit arbejde, herunder mulighed for delvis hybrid/hjemmearbejde og fokus på balancen mellem arbejdsliv og fritid.
- Mulighed for faglig udvikling gennem kurser og sparring.
- En central rolle på et teknisk eliteuniversitet, der er kendt for innovation og bæredygtighed.
- Et uformelt og positivt arbejdsmiljø med engagerede og dygtige kolleger.
Løn og ansættelsesvilkår
Løn- og ansættelsesvilkår i henhold til overenskomst for akademikere i staten eller anden relevant overenskomst.
Forventet tiltrædelse 1. juni 2026.
Arbejdssted er DTU Lyngby Campus.
Ansøgning og kontakt
Vi skal modtage din online ansøgning senest den 7. april 2026
.
Åbn linket "Ansøg nu", hvor du udfylder ansøgningsformularen samt vedhæfter motiveret ansøgning, CV og eksamensbeviser.
Har du spørgsmål eller ønsker du flere oplysninger om stillingen, er du velkommen til at sektionsleder Eva Rasmussen på 2161 5838.
Ansøgninger modtaget efter ansøgningsfristens udløb tages ikke i betragtning.
Alle interesserede uanset alder, køn, handicap, race, religion eller etnisk tilhørsforhold, opfordres til at søge stillingen. Da DTU arbejder med forskning i kritisk teknologi, hvormed der gælder særlige regler for blandt andet sikkerhed og eksportkontrol, kan der blive foretage open source-baggrundstjek af kvalificerede kandidater til stillingen.
DTU – Til gavn for samfundet siden 1829
DTU er et af Europas førende tekniske eliteuniversiteter. Med forskning og uddannelser i international topklasse skaber vi løsninger på tidens store samfundsmæssige udfordringer og bidrager til at sikre Europas globale førerposition inden for bæredygtig teknologiudvikling. Siden H.C. Ørsted grundlagde DTU for snart 200 år siden, har vores mission været den samme: Vi udvikler og nyttiggør naturvidenskab og teknisk videnskab til gavn for samfundet. DTU har 13.800 studerende, 1.600 ph.d.-studerende og 6.500 ansatte. Vi arbejder i et internationalt miljø og har en inkluderende, udviklende og uformel arbejdskultur. DTU har campusser i hele Danmark og i Grønland og samarbejder med de bedste universiteter verden over.