Dr. Kıvılcım YÜKSEL ALDOĞAN
Business development specialist at TÜBİTAK BİLGEM)
Full List of our PUBLICATIONS:
THESES SUPERVISED IN OUR LAB
Şamil SIRIN. Fiber Optic Current Sensor Interrogated By Phase-Sensitive Optical Time- Domain Reflectometer, IYTE, September 2019-2022.
Ertunga Burak KOCAL Development of a Simulation Tool for FBG-based Phase-OTDR Vibration Sensors, IYTE, September 2018-2021.
Melike DEMIREL Framework for evaluating security and maintenance issues in optical fiber access networks: case for Turkey, IYTE, December 2018-canceled.
Hurriyet YUCE CAKIR. Potential Applications of Inorganic Optical Elements and Polymeric Systems, IYTE, 2018-2022.
Cansu IDE. Analysis and implementation of long period fiber grating and Fresnel reflection-based sensors for refractive index measurement of liquids, IYTE, July 2017.
Anil YILMAZ. Analysis and implementation of optical fiber sensors for process monitoring of composie materials, IYTE, December 2016.
Gizem SOYLU. Exploiting second harmonic generation for microelectronics interface characterization, IYTE, July 2016.
Deniz OZCAN PALA. Analysis and modeling of a novel approach for the interrogation unit of fiber Bragg gratings sensors using optical frequency- domain reflectometry techniques, IYTE, July 2014.
PAST GRADUATION PROJECTS
(by Arda Metin Akdar, E. Taşdeviren)
(by Eylül ÇAKIR, Barış Deniz GÖKMEN)
(by Ceyhun Efe KAYAN)
(by Engin Yunus Güner)
(by Ege Kızgın)
(by Arda Şahin)- Tubitak 2209
(by Florent Dransart, HELHa, Belgium)-Erasmus Internship Programme
(by Şamil Şirin)-Tübitak-2209
(by Hazal Kahraman)-Tübitak 2209
(by Onur Ateş)-Tübitak 2209
(by Doğuş Karabulut)
(by Nazlıcan Yılmaz, Büşra Akbulut)
(by Ali Yılmaz, UMONS, Belgium)-Erasmus Internship Programme
(by Remzi Altunörs and Çağla Demir)
(by Serkan Ormancı)
(by Anıl Yılmaz)
AFTER OBTAINING A MASTER’S DEGREE
Cansu İDE ÇETİN (2014-2017): Research and development engineer at Optify (The Netherlands).
Formerly worked at Ermaksan and Nanotam upon graduation.
Anıl YILMAZ (2013-2016): System Safety Engineer at Volvo Cars (Sweden)
Deniz ÖZCAN PALA (2012-2014): International Projects Team Leader at Kentkart (Izmir, TR)
AFTER REALISING A GRADUATION PROJECT AT OUR LAB
Hazal Kahraman (2019): System design engineer at ASELSAN (Ankara, TR).
Doğuş Karabulut (2018): Data scientist at Veriff (Estonie).
Nazlıcan Yılmaz (2017): System engineer at ASELSAN (Ankara, TR)
Büşra Akbulut (2017): Product and support engineer at OSIsoft (Germany).
Çağla Demir (2016): Information security engineer at NETSMART (Istanbul, TR)
VIDEOS FROM GRADUATES
In this study, a two-stage feature extraction methodology that combines the capabilities of these neural network architectures with transfer learning is proposed to classify vibrations applied to an optical fiber by a piezoelectric transducer. First, the differential amplitude and phase information is extracted from the phase-sensitive optical time domain reflectometer.
Phase-OTDR recordings and stored in a spatiotemporal data matrix. Then, a state-of-the-art pre-trained CNN without dense layers is used as a feature extractor in the first stage. In the second stage, LSTMs are used to further analyze the features extracted by the CNN. Finally, a dense layer is used to classify the extracted features. To observe the effect of different CNN architectures, the proposed model is tested with five state-of-the-art pre-trained models (VGG-16, ResNet-50, DenseNet-121, MobileNet, and Inception-v3). The results show that using the VGG-16 architecture in the proposed framework manages to obtain a 100% classification accuracy in 50 trainings and got the best results on the phase-OTDR dataset. The results of this study indicate that pre-trained CNNs combined with LSTM are very suitable to analyze the differential amplitude and phase information represented in a spatiotemporal data matrix, which is promising for event recognition operations in DAS applications.
Our senior undergraduate students presented their posters and demonstrated project artefacts.
A project entitled “Implementation of a Phase Demodulation Algorithm for Optical Reflectometry Systems” was realised and successfully demonstrated.
Seminar titles are as follows:
Dr Bharti is a recipient of “Transformative Researcher of the Year Award-2022 for EE Department” which was awarded by Chandigarh University. Currently, he is an Assistant Professor in Electrical Engineering Department of Chandigarh University.
His current research interests include Photonics, Optical Sensor, Optical Signal Processing and Nonlinear Optics.
He is the active member of IEEE, IEEE Photonics Society, IEEE Sensors Council, IEEE Nanotechnology Council, OPTICA (Formerly OSA), SPIE and other professional bodies. He is the founder and past Chairman of the IEEE NIT Agartala student branch. Currently, he is a Chapter Advisor of IEEE Photonics Society Chandigarh University Student Branch Chapter.
In this paper, the parasitic components (i.e., multi-reflections, Rayleigh scattering, photodetector noise, and phase variations due to external perturbations) are analysed and based on this analysis, a new signal to noise ratio (SNR) definition is provided suitable for the FBG-assisted Phase-OTDR system. A detailed analysis of performance parameters in the presence of multi reflection crosstalk (including its first- and second-order components) and spectral shadowing crosstalk is presented. SNR was calculated for different reflectivity and spacing lengths showing that the maximum number of cascaded FBGs can be significantly increased by using lower FBG reflectivity.
It was also observed that the spacing length distance does not have a significant impact on the maximum number of FBGs that can be interrogated. By comparing single-pulse and double-pulse configurations, the use of double pulse was shown to provide higher SNR values when the number of FBGs is around 100 FBGs. The multi-reflection crosstalk when combined with the spectral-shadowing effect was demonstrated to create secondary crosstalk components making the interpretation of spectral analysis more difficult.
Current Sensing Using a Phase-Sensitive Optical Time Domain Reflectometer: Feasibility Study
A novel method for distributed current sensing using an FBG-assisted Phase-OTDR with Mach-Zehnder Interferometer is proposed. The detrimental effect of the intrinsic linear birefringence of the sensing fiber is solved by calibration. An FBG pair is written at the two ends of the spun fiber coil to eliminate phase fading and increase the measurement accuracy. A simulation tool was developed to reveal the feasibility of the approach by investigating the impact of the detector noise as well as the effects of bending- and FBG-induced linear birefringence on the sensing performance.
IZTECH Photonics Department hosted representatives of ASELSAN Laser Systems Directorate giving valuable presentations. They introduced ASELSAN and shared with us the work of the Microelectronics and Electro-Optics Sector Presidency (MGEO) Laser Systems Design Department in particular.
October 20, Thursday
09:30 – 10:00 Opening
10:00 – 11:00 Sheng-Lung Huang – Optical Coherence Tomography: Technologies and Challenges (National Taiwan University) 11:00 – 12:00 Atilla Aydınlı – Evolution of Laser Technologies
12:00 – 14:00 BREAK
14:00 – 15:00 Elias Stathatos – All printed third generation solar cells and modules made of perovskites under ambient conditions
(University of Peloponnese)
15:00 – 16:00 Serap Güneş – Recent Developments in Emerging PV Technologies (Yıldız Technical University)
16:00 – 17:00 Mehmet Öğüt – Applications of Photonics in remote sensing (NASA JPL)
17:00 – 18:00 Sudip Shekhar – Scaling up silicon photonic-based accelerators:Challenges and opportunities (University of British Columbia)
October 21, Friday
10:00 – 11:00 Serhat Tozburun – Photothermal Coagulation of the Superficial Layer of the Esophagus (9 Eylül University)
11:00 – 12:00 Wim Bogaerts – Programmable Photonics (Ghent University and IMEC)
12:00 – 14:00 BREAK
14:00 – 15:00 Richard Zeltner – Sensing using optically trapped micro particles (Menlo Systems GmbH)
15:00 – 16:00 Hasan Göktaş – Photonic-MEMS for Programable Photonic Integrated Circuits (Izmir Institute of Technology) 16:00 – 17:00 Amr Helmy – Efficient Plasmonic Circuits for Data Communications (University of Toronto)
Purpose of the workshop:
To follow the developments in global laser technologies and their applications.
To help accelerate the development of laser technologies.
To determine the status of the technology infrastructure as well as, the needs and capabilities of the sector.
To identify needs for the development of lasers and their components.
To bring together researchers and industry players to make economic predictions on global and domestic laser technologies.
Şamil Şirin and Aybüke Özçelik have gotten a professional certificate in
Phot1x: Silicon Photonics Design, Fabrication and Data Analysis,
a course offered by UBCx, an online learning initiative of The University of British Columbia through edX. Silicon Photonics is a promising study area which combines the advantages of already-existing silicone technology for electronic chips with light-based high-speed communication.
OZ Optics Ltd. was at IzTECH
Thesis Proposal Seminar
Transnational cooperative research and development project support from IraSME
Term Project Seminars in the framework of graduate course
EE513 (Fiber Optic Sensors)
by Ceren Özkal
An overview of FBG-assisted Phase-OTDR Techniques presented at ICTON’2020
Our paper has been accepted for a poster presentation at the International Conference on Optical Fiber Sensors (OFS 2020)
Şamil Şirin joined EE Department and our Lab as research assistant
Ligth Fidelity (Li-Fi) demo realised
Set-up demo video:
We participated to Technology Days organised by Izmir Universities Platform
Şamil Şirin gave a talk on “Development of a simulation tool for vibration sensors based on Phase-OTDR interrogator” at ASYU’2019
Dr. Yüksel Aldoğan organised and chaired a special session at ASYU’2019
Dr. Yüksel Aldoğan was at UMONS (Belgium)
Tubitak 2209-A Grant obtained for three graduation projects
Ertunga Burak Koçal joined EE Department and our Lab as research assistant
Dr. Yüksel Aldoğan’s project proposal for TUBITAK BIDEB-2219 International Postdoctoral Research Fellowship Program was granted
Dr. Yüksel Aldoğan became an academic board member of Photonics Department of IZTECH
Dr. Yüksel Aldoğan became an academic collaborator of Electromagnetism and Telecommunication Department of Mons University (UMONS, Belgium)