• Another new publication at APL Photonics

    We are proud to announce that another paper from our group has been accepted at APL Photonics this month, titled “Linearized integrated microwave photonic circuit for filtering and phase shifting”.

    Congrats, Gaojian and Steven!

  • Martijn graduated

    On May 17th, Martijn van den Berg graduated from our group with Bachelor degree. He worked with Steven and the whole group on “Simultaneous True Time Delay and Notch Filtering photonic RF front-end” for the last half year.

    Congrats, Martijn! And keep rowing forward!

    Martijn (center) with the graduation committee after the defense

  • New publication at APL Photonics

    We are pleased that our lastest paper titled “Brillouin and Kerr nonlinearities of a low-index silicon oxynitride platform” has been accepted at APL Photonics, and selected as Editor’s pick.

    This is a collaborative work between our group and Prof. Andrea Melloni’s research group from Politecnico di Milano. Congrats to all authors!

  • David celebrated the 12.5-year anniversary

    Time flies fast. David has worked 12.5 years at the University of Twente since his Ph.D. To celebrate this very Dutch anniversary, he brought some Indonesian snacks this week to the whole group.

    Congrats, David! Hope you and we as the whole group can make even bigger achievements in the next 12.5 years.

    Klaus handed David the celebration letter from the faculty

  • Redlef graduated

    On January 20th, Redlef Braamhaar defended his MSc thesis titled Polarization pulling in a stimulated Brillouin scattering based microwave photonic filter under the supervision of Yvan and Steven.

    After the defense Redlef received a bottle of Whiskey as a gift, which he emptied just an hour later at the celebration party. Congrats Redlef, hope you are not too drunk!

    Redlef received the gift from Yvan after the defense

  • Okky’s last day in our group

    After a short graduation trip around Europe, Okky revisited the group for the last time before he leaves the Netherlands. Later, he will start a new life in Indonesian Air Force as a researcher.

    Good luck, Okky! You are always welcome in our group and hope to see you again in the future!

    Okky in front of his setup

  • Potluck party 2022

    As 2022 draws close to the end, the group organized a potluck dinner this week to celebrate the coming of the Christmas break. We shared Dutch, German, Pakistani, Chinese, and Indonesian food at the party, and all of them are amazingly delicious!

    2022 has been a big year for the group. We have gone through ups and downs together (mostly up :-). Merry Christmas and happy new year everyone! Wish all of us can continue the success in 2023!

    Group photo at the potluck party

  • New Publication in Nature Communications

    We are excited to announce that our new paper  Ultrahigh Dynamic Range and Low Noise Figure Programmable Integrated Microwave Photonic Filter has been published in Nature Communications.

    Artistic impression of an ultra-high dynamic range programmable integrated MWP circuit.

    In this work, we demonstrate reconfigurable filter functions with record-low noise figure and a RF notch filter with ultra-high dynamic range. We achieve this unique feature using versatile complex spectrum tailoring enabled by an all integrated modulation transformer and a double injection ring resonator as a multi-function optical filtering component. Our work breaks the conventional and fragmented approach of integration, functionality and performance that currently prevents the adoption of integrated MWP systems in real applications.

    This publication is another achievement for the group in a fruitful 2022. Congrats Okky, Gaojian and the team for all the heroic efforts!

    This post also appears at the front page of the University of Twente.

  • Okky graduated with Ph.D. Cum Laude

    We are super excited that Okky Daulay earned his Ph.D. Cum Laude on December 14th, 2022.

    Okky spends four years in our group and has always been an excellent experimentalist, an ambitious colleague, and a dependable teammate.

    Thank you for your dedication, Okky! Congratulations and wish you all the best!

    Okky defended his Ph.D. thesis with his paranymphs (Steven and Yvan)
    Group photo after Okky’s defense

  • Colloquium by Prof. Radan Slavik (University of Southampton)

    This Tuesday, Prof. Radan Slavik from University of Southampton, United Kingdom gave us a colloquium on Microwave photonics using hollow core optical fibres. Thank you Radan for this impressive talk!

    Lab tour with Radan (from left to right: Radan, Yvan, David, Roel, Steven)

  • New publication in Science Advances

    We are excited to announce that our new paper Guided-acoustic stimulated Brillouin scattering in silicon nitride photonic circuits has been published in Science Advances.

    3D illustration of the concept of trapping photon and phonon in multilayer silicon nitride waveguides

    In this work, we use the symmetric double-stripe silicon nitride waveguide from LioniX to guide both the photon and phonon, showing the possibility to integrate stimulated Brillouin scattering in large circuits. This breakthrough will potentially be integrated with other emerging technologies such as tunable lasers, frequency combs, and programmable photonic circuits, and giving them a part in the future development of fields ranging from telecommunications to quantum computing.

    This publication is a great achievement for Roel, and of course, also for the whole team. Congrats all!

    Photo of the team (from left to right: Okky, Steven, Roel, Peter, David, and Yvan)

    This news also appears at the front page of the  University of Twente website.

  • David becomes a full professor

    Recently, David has been appointed as a full professor of the brand-new chair Nonlinear Nanophotonics (NLNP). From now on, the NLNP will run as an independent research group at the University of Twente.

    David brought cakes for the whole group for celebration

  • Oral presentation at ECOC 2022

    We are excited that Steven’s paper has been selected for an oral presentation at ECOC 2022, Basel, Switzerland. The paper is titled, “Integrated Microwave Photonic Phase Shifter with Ultrahigh Dynamic Range”.

  • Gaojian won a young talent award

    Gaojian has won a young talent award in the flash report competition at the Seventh Chinese Symposium on Microwave Photonics Technology and Applications. His report is about On-chip linearization methods for MWP system. Congratulations Gaojian!

  • Jasper, Sam, and Lou Graduated

    Three very brilliant students graduated from our group recently!

    First, on July 8th Jasper van den Hoogen defended his MSc thesis titled Brillouin dynamic gratings in a silicon nitride waveguide, under the supervision of Roel and Steven.

    On July 11th, Sam Rappange defended his BSc thesis titled Programmable double injection coupled ring resonators for microwave photonic signal processing under the supervision of Okky.

    Finally, on July 12th Lou Kanger defended his MSc thesis titled Generation of Kerr frequency combs for microwave photonics under the supervision of Yvan and Okky.

    After the defenses, all three students received presents for their great work. The whole group also had lunch together to celebrate graduations and the coming of summer holidays.

  • Two oral presentations at CLEO 2022

    We are excited that two papers in our group have been accepted for oral presentations at CLEO 2022, San Jose, California, USA. They are:

  • ERC Consolidator grant for David Marpaung

    David received the ERC Consolidator grant for the project TRIFFIC. He  will develop an new class of 3D photonic integrated circuit for actuating stimulated Brillouin scattering in silicon nitride. With this entirely novel circuit, he will show for the first time that interactions between light and sound can also be programmed, just like for electronic circuits. 

    David will receive 2.55 million euros for his project, the largest Consolidator Grant so far in Twente, and third-largest ever in The Netherlands.

    This news also appears at the University of Twente website.

    3D artistic illustration of the TRIFFIC project.
    The whole group celebrates this good news with cakes.

  • New publication in OL

    We have a new publication in Optics Letters (OL) titled Self mode-locking in a high-power hybrid silicon nitride integrated laser.

    In this paper, Yvan demonstrated  the self-mode-locking of a hybrid integrated laser comprising two indium phosphide gain sections and a silicon nitride feedback circuit that filters light using two ring resonators.

  • New funded project from ARC

    Our group, as a partner for the RMIT University in Australia, recently get the Discovery project 2022 funded by Australian Research Council (ARC).

    This project will focus on developing new microwave photonic systems based on acousto-electric phonon-amplified SBS.  The official announcement of this project at the ARC website can be found in this  link.

  • David elected Optica Fellow

    David has been elected Optica Fellow ’For pioneering contributions to the research and development of integrated microwave photonic devices and systems’.

    There’s a nice news item on this article appearing at the University of Twente website. The Optica news release is here.

  • Best student paper award at MWP 2021

    Gaojian won the best student paper award at the 2021 IEEE Microwave Photonics conference. In his paper he reported world-record high dynamic range for an integrated microwave photonic system. Congratulations Gaojian!  

  • Celebration party for Optica Fellow

    Recently we received a piece of good news that David was elected as a Fellow of the Optica society (formerly OSA)! David brought cakes and celebrated with the whole group. Congratulations David, we are so proud of you!

  • A farewell to Gaojian

    On November 10th, Gaojian finished his two-year guesting Ph.D. in our group and returned to China. From 2019 to 2021, he conducted many important microwave photonics experiments with this fancy setup and published two journal articles (JLT 2021 and OE 2020). Good luck, Gaojian! You will always be welcomed here!

  • Four oral presentations at MWP 2021

    We are excited that four papers in our group have been accepted for oral presentations at MWP 2021, Italy. They are:

    Congratulations all!

    Optical spectrum and transmission of the Vernier filter (Yvan)
    Experiments setup (Okky)
    Operating principles of the notch filter and linearization (Gaojian)
    Optical and acoustic profiles of the ADS and SDS waveguides (Roel)

  • Roland Graduated

    On August 6th, Roland Adelerhof defended his MSc thesis titled Numerical Investigation of Surface Acoustic Waves in a Silica Ridge Waveguide for Optical Modulation under the supervision of Radius.

    Roland presented in a  hybrid in-person and online defense. After the defense he received a present from the whole group.  Congrats Roland!

  • Best paper award at ISMOA 2021

    Okky has won the best paper award at the International Symposium on Modern Optics and Its Applications (ISMOA 2021). Congratulations Okky!

  • Inaugural May-On Tjia lecture at ISMOA 2021

    David delivered the inaugural May-On Tjia lecture at the International Symposium on Modern Optics and Its Applications (ISMOA 2021). This is a lecture to commemorate Prof. Tjia, who is a giant and influential figure for Indonesian physics community. In this 45 minute lecture, David recalled some past experiences with Prof. Tjia  and went on to discuss state-of-the-art of programmable photonic circuits. You can watch the recording of the lecture here.

  • Highly-scored paper in ECOC 2021

    We are excited that Okky’s paper has been accepted for an oral presentation at ECOC 2021, Bordeaux. The paper is also selected as highly-scored paper. Congrats Okky!

  • New publication in JLT

    We have a new publication in Journal of Lightwave Technology (JLT) titled Integrated microwave photonic spectral shaping for linearization and spurious-free dynamic range enhancement. In this paper, Gaojian demonstrated two novel linearization techniques using serial and parallel arrays of silicon nitride ring resonators.

  • New publication in APL Photonics

    We have a new publication in APL Photonics titled Versatile silicon microwave photonic spectral shaper. This was a collaborative work between our group, The University of Sydney, and Ghent University. The article has been selected as Editor’s pick, and can be found here.

    There’s a nice news item on this article appearing at the University of Twente website and PhysOrg.

  • Three new publications on integrated microwave photonics spectral shaping

    We have been ramping up in our research activities on integrated microwave photonics spectral shaping. We have three new papers appearing in Journal of Lightwave Technology (JLT), Optics Express, and Optics Letters.

    In JLT paper we present an invited tutorial on the new concept of Integrated Microwave Photonic Spectral Shaping. The article can be found here.

    In the Optics Express paper, Gaojian demonstrated that line-by-line spectral shaping using ring resonators can be used to linearize the transfer function of a microwave photonic link. The paper is titled  Linearized Phase Modulated Microwave Photonic Link based on Integrated Ring Resonators and the article can be found here.

    Finally, in the Optics Letters article, Okky demonstrated a Microwave Photonic Notch Filter with Integrated Modulation Transformation and Optical Carrier Suppression all integrated in  a silicon nitride circuit. The paper can be found here.

  • Thomas, Pieter, and Max graduated

    We recently have three very successful student graduations!

    First, on January 28th Thomas Zeinstra defended his BSc thesis titled Programmable Microring Resonator with Double Injection in Silicon Nitride, under the supervision of Okky.

    On February 1st, Pieter van Essen defended his BSc thesis titled Stimulated Brillouin Scattering in Silicon Nitride using a Racetrack Resonator under the supervision of Yvan.

    Finally, on February 12th Max Kiewit defended his MSc thesis titled Integrated Brillouin Lasing in Cascaded Double Ring Resonators under the supervision of Roel.

    After the online defense all three students received presents from the whole group. Don’t finish them in one go guys! 🙂

  • End of year

    Our group had our online end of year celebration! Let’s hope for the best for 2021!

  • How we’ve grown

    Exactly two years ago to the day, our group had our very first operational experimental testbed (see News from Sept. 14th, 2018 below). At that time our group consisted of only two people (David, and Okky as an intern). Now we are 13-people strong  with 7 operational testbeds. O how we’ve grown!

  • Xin graduated

    After a grueling online defense, Xin Guo has successfully defended his Master thesis titled “Universal Microwave Photonic Modulation Transformer”. After the defense, Okky (his daily supervisor) presented Xin with a gift from the group. Next stop for Xin: a PhD in the prestigious  Photonics Research Group at Ghent University. Good luck Xin!

  • New publication in OSA Continuum

    We managed to break the egg and have the very first journal paper from the Nonlinear Nanophotonics group! Okky’s work on a programmable RF photonic bandpass filter in a silicon nitride circuit came out in OSA Continuum ! The article can be found here.

  • Invited Talk at Advanced Photonics Congress 2020

    On July 15th David gave his invited talk at the OSA Advanced Photonics Congress 2020. He was discussing new approaches for Integrated Microwave Photonic Spectral shaping.  The video can played by clicking the picture above or by clicking here.

  • Bjorn graduated

    Bjorn Jongebloed has successfully defended his Bachelor thesis titled “Characterization of Linearity and Noise in Fiber-based Brillouin Amplifiers”. After the defense, Bjorn was  presented a gift of a selection of craft beers from the group. Congrats Bjorn!

  • New publication in advances in optics and photonics (AOP)

    We have a new paper coming out in OSA Advances in Optics and Photonics in collaboration with the Eggleton group at Sydney University and the Choudhary UFO-Chip group at IIT Delhi. The paper reviews recent advanced in Integrated Microwave Photonic Filters ! The article can be found here.

  • Guest talk Maurizio Burla (ETH Zurich)

    Today in our weekly group meeting we have a guest talk from Dr. Maurizio Burla (ETH Zurich) speaking about photonic simulation and chip layouting. Thank you Maurizio for kindly sharing with us!

  • Science from home

    As nearly everyone in the world, our ways of working are altered due to Covid-19. These days Zoom meetings replace face-to-face meetings. Nevertheless we are still happy and motivated!

  • OFC 2020 Tutorial video

    On March 12th David recorded a video for his invited tutorial on Integrated Microwave Photonics at the OFC 2020 conference. The video can played/downloaded by clicking the picture above or by clicking here.


    On March 7th David and Okky reached out to the Indonesian students in Enschede through the event “IDEx, Inspirations from Enschede” organized by the Indonesia student association in Enschede (PPI Enschede).

  • Happy holidays

    Happy holidays from the LPNO group! It’s been an exciting year with ups and downs, but more importantly,  a lot of growth! Let’s come back stronger and fresher in 2020!

  • New member: Radius suryadharma

    Radius joins us from the Rockstuhl group at Karlsruhe Institute of Technology (as evident from his shirt), as a postdoctoral researcher. He will be working on the exciting field of nonlinear phononics. Welcome Radius!

  • New member: Gaojian Liu

    This week Gaojian Liu joins us as a CSC visiting PhD student from China Academy of Space Technology in Xi’an. Gaojian will stay with us for 1.5 years and will be working on the topic of Programmable Integrated Photonics. Welcome Gaojian!

  • Postdeadline paper at ACP 2019

    Xin’s work on the Silicon Photonic Modulation Transformer has bee accepted as a postdeadline presentation at the Asia Photonics and Communications Conference (ACP 2019)! The work is a collaboration between our group and The Eggleton Group at University of Sydney, The Photonics Research group at Ghent University, and Microsoft Quantum University of Sydney.

  • David gave a guest lecture For IIT delhi students

    On October 16th David gave a Skype guest lecture on Optical Beamforming to students at the Indian Institute of Technology (IIT) Delhi. This was a part of the Microwave Photonics course given by Prof. Amol Choudhary.

  • New publication in Optics Express

    Okky and David co-authored a new paper with the Eggleton group at the University of Sydney about a high link gain Rf photonic bandpass filter in a silicon nitride circuit. The paper can be downloaded (open access) from this link.

  • Xin’s internship in Sydney

    Xin is wrapping up his 6-month internship at the University of Sydney. He gave his final group talk about his project on silicon-photonic modulation transformer on Friday October 18th.

  • New publication in Journal of optics

    Check out the Roadmap on All-optical processing published in the Journal of Optics, includes a chapter on “Integrated Microwave Photonic Signal Processing” from our group! The paper can be downloaded (open access) from this link.

  • New vacancies

    We have new openings for 1 PhD and 1 postdoc positions in the project “On-chip Photonic Control of Gigahertz Phonons”. Details of the vacancies can be found here.

  • David has been awarded the NWO START-UP grant 

    David has been awarded the START-UP grant of 800,000 Euros by the science division of the Netherlands Organisation for Scientific Research (NWO). The START-UP programme is intended for newly appointed faculties working in the field of physics and chemistry.

    The 4-year project will focus on new ways of controlling gigahertz phonons using integrated photonics. There will be several open PhD and postdoc positions in this project, so if you’re interested please contact David.

    The official announcement of the grant in at the NWO website can be found in this  link.

  • New review paper on Nature Photonics: Integrated Microwave Photonics

    Our new paper “Integrated Microwave Photonics” just appeared in Nature Photonics (link). In this work we collaborated with the groups of Prof. Jianping Yao in the University of Ottawa and Prof. Jose Capmany in UPV Valencia.

    The paper is also highlighted at the English front page of the University of Twente (link)

  • New paper on Arxiv: New Opportunities for Integrated Microwave Photonics

    Our new paper “New Opportunities for Integrated Microwave Photonics” just appeared in Arxiv (link).

  • Measurement setup is live

    Today the first nonlinear nanophotonic characterization setup in the group is live!

  • OSA Webinar October 4th, 2018

    David will present an OSA Webinar featuring a discussion on “Nonlinear Integrated Microwave Photonics”.

    The webinar is scheduled for Thursday October 4th from 10:30 am (EDT)/16:30 (CEST).

    In this webinar David will discuss how on-chip nonlinear optical processes can be harnessed for enhanced microwave photonic signal processing. The discussion will introduce basic concepts and requirements of microwave photonic systems and define the range of physical problems that can be addressed with nonlinear optics.

    To register (free) and get more information follow this link.

  • New MSc and BSc assignments

    We have a number of exciting MSc and BSc assignments in the areas of integrated microwave photonics, nonlinear photonics, and on-chip stimulated Brillouin scattering. For more details see here.

  • Available Ph.D. position

    We are looking for an excellent candidate for a PhD project on the topic of nonlinear integrated phononic-photonic signal processing in low-loss silicon nitride. For more details see here.

  • Promotion

    David has been officially promoted to the role of associate professor with tenure.

  • David has been awarded the prestigious NWO Vidi grant

    David has been awarded the Vidi grant of 800,000 Euros by the applied and engineering science division of the Netherlands Organisation for Scientific Research (NWO).

    The 5-year project will focus on developing novel signal processing circuits based on coherent light and sound interactions. The official announcement of the grant in at the NWO website can be found in this  link.