(Principle Investigator)


(Research Assistant)

Ceren Özkal

(Research Assistant)



(MSc candidate,

Business development specialist at TÜBİTAK BİLGEM)



(MSc Student)

Fiber Sensor Lab is accepting enthusiastic grad/undergrad students who are interested in developing novel technologies for sensing applications. 
Please contact Dr. Kıvılcım Yüksel Aldoğan if you are interested.
  • Optical fiber metrology
  • Distributed and quasi-distributed optical fibre sensors
    • OFDR, Phase-OTDR, OTDR
  • Applications of Fiber Bragg Gratings
    • Chemical (SRI), Physical (temperature, strain, pressure)
  • Photonics Integrated Circuits
  • Development of innovative concepts for low cost intelligent traffic management and transportation systems
  • Optical access networks, Passive Optical Networks (PONs)
  • Physical layer monitoring of PONs, Fiber to the home (FTTH) technologies.

Full List of our PUBLICATIONS:

Click HERE.


Interested in realising a Master Degree  in Fiber Optics?

Contact us: kivilcimyuksel@iyte.edu.tr


  • Aybüke OZCELIK. Photonic Integrated Circuits and Sensor Applications, IYTE, January 2021-ongoing.
  • 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.

Interested in realising a graduation project in Photonic Technology?

Contact us: kivilcimyuksel@iyte.edu.tr


  • 2022. Implementation of a Phase Demodulation Algorithm for Optical Reflectometry Systems

          (by Arda Metin Akdar, E. Taşdeviren)

  • 2022. Feasibility analysis of a sensor-assisted industrial heating system 

(by Eylül ÇAKIR, Barış Deniz GÖKMEN)

  • 2021. (co-advisor) Analysis of Phase-OTDR Sensing System based on Deep Learning 

(by Ceyhun Efe KAYAN)

  • 2021. Analysis of the Imperfections Associated with Current Sensing System Based on POTDR (Poster of the project)

(by Engin Yunus Güner)

  • 2021. Development of an Interactive Education Tool: Polarization State Trace along an Optical System 

(by Ege Kızgın)

  • 2020. Unidirectional wireless data transfer between multiple devices using visible light spectrum. (Poster of the project.)

(by Arda Şahin)- Tubitak 2209

  • 2019. Development of a Li-Fi (Light Fidelity) Prototype

(by Florent Dransart, HELHa, Belgium)-Erasmus Internship Programme

  • 2019. Development of a simulation tool for optical fibre vibration sensor

(by Şamil Şirin)-Tübitak-2209

  • 2019. Design and Implementation of a Computer-Aided Calibration System for Fiber Bragg Grating Sensors

(by Hazal Kahraman)-Tübitak 2209

  • 2019.Analysis and implementation of Li-Fi System

(by Onur Ateş)-Tübitak 2209

  • 2018. Fundamentals of Optical Fiber Sensing Schemes based on Coherent OTDR

(by Doğuş Karabulut)

  • 2017.  Analysis and Implementationof a New Sensor InterrogationApproachBasedon Fiber CavityRing-Downand OTDR

(by Nazlıcan Yılmaz, Büşra Akbulut)

  • 2016. Analysis and implementation of opticalfiber sensors for monitoring of composite materials

(by Ali Yılmaz, UMONS, Belgium)-Erasmus Internship Programme

  • 2016. Analysis and implementation of a refractive index sensor based on Optical Time Domain Reflectometer

(by Remzi Altunörs and Çağla Demir)

  • 2015. Analysis and implementation of a tool for the physical-layer monitoring of optical access networks (TRA method)

(by Serkan Ormancı)

  • 2014. Theoretical Study of the Birefringence Effect in FBGs Using Transfer Matrix Method

(by Anıl Yılmaz)

Technical elective courses on Photonics.



  • EE-221. Concepts of Modern Physics (core course, Syllabus-2019)
  • EE-313. Microelectronics (core course, Syllabus-2020)
  • PHOT-505. Applied Photonics (Project, Spring 2020)

Where are they working now?


  • Ertunga Burak KOÇAL (2018-2021): Software consultant at Knowit (Sweden).
  • Cansu İDE ÇETİN (2014-2017): Research and development engineer at Optify (The Netherlands).

          Formerly worked at Ermaksan and Nanotam upon graduation.


  • Arda Şahin (2020): System design engineer at ASELSAN (Ankara, TR).
  • Hazal Kahraman (2019): System design engineer at ASELSAN (Ankara, TR).

  • Şamil Şirin (2019): Research assistant at Izmir Institute of Technology (Izmir, 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)



Between 2013 -2022, a total of 16 undergraduate students from our department (Electronics Engineering Department) realised their summer internships (between 2 and 3 months) on photonics technology at the state-of-the-art laboratories of UMONS (Electromagnetism and Telecommunications Department).


February 2023

New paper published in Applied Optics

Intensity and phase stacked analysis of a Φ-OTDR system using deep transfer learning and recurrent neural networks

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.

January 2023

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. 

December 2022

Dr. Gaurav Kumar Bharti from Chandigarh University, India gave a Series of Lectures

Seminar titles are as follows:

  • Photonics and Optical Switches- An Introduction
  • Nonlinear Optics and Silicon Photonics-An Introduction
  • Design and Modelling of an all-optical logic switch using Ring Resonator
  • Modelling and Simulation of optical sensors using photonic crystals.
  • Hands-on session for the simulation of photonic circuits using FDTD simulation platform

December 2022

We welcome Dr. Gaurav Kumar Bharti

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.

December 2022

New paper published in Optical Fiber Technology

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.

November 2022

New paper published in Optical Fiber Technology

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.

November 2022

ASELSAN  representatives were at IZTECH Campus

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 2022

We celebrated the 21st October Wold Photonics Day 

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)

October 2022

We participated Lasers and Industrial Applications Workshop

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.

September 2022

Silicon Photonics certificate

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.

July 2022

Master Thesis defense

Our sincere congrats to Şamil Şirin who successfully defended his master thesis.
We wish all the best in his future!

Thesis title:

Fiber optic current sensor interrogated by Phase-sensitive OTDR.

We would like to thank to Prof.Dr. Marc Wuilpart and honorable members (Dr. Sinan Balcı and Dr. Özhan Ünverdi) of the jury for their valuable contributions.

March 2022

OZ Optics Ltd. was at IzTECH

OZ Optics President Ömür Sezerman and OZ Optics Turkey General Manager Onur KOCA visited IzTECH Photonics Department on March 29, 2022. Joined by our faculty, graduate and undergraduate students, the meeting started with department presentation by Prof. Canan Varlikli and continued with a panel discussion with Mr. Sezerman and Mr. Koca.

As a graduate faculty member of IzTECH Photonics Department, Dr. Yüksel gave a presentation about the activities of Optical Fiber Metrology and Sensors Lab.

January 2022

Thesis Proposal Seminar

Aybüke Özçelik gave a talk on “Fiber Optic Sensor-Assisted Microwave Heating System”

July 2021

Congratulations to Ertunga Burak Koçal to got his master degree

Development of Simulation Tool for FBG-based Phase-OTDR Vibration Sensors

July 2021

Transnational cooperative research and development project support from IraSME

The project titled “FOSASMICROHEAT” which our consortium submitted during the 27th IraSME call for proposals has been approved.

This call was organised by IraSME, a network for national and regional funding schemes to promote transnational cooperative research and development projects between SMEs and research organisations. TÜBITAK (Turkey) and SPW (Wallonia/Belgium) were involved in evaluating the proposal.

The project consortium is composed of MET Advanced Technology Systems, Optical Fiber Metrology and Sensors Laboratory and B-Sens Creating Sensing Solutions.


January 2021

Term Project Seminars in the framework of graduate course

EE513 (Fiber Optic Sensors)

  • A Market Research of Fiber Optic Sensors

by Ceren Özkal

  • A review of Surface Plasmon Resonance (SPR)-based fiber optic biosensors
by Enes Ataç
  • An Overview of Optical Fiber Sensors in Large-Scale Particle Accelerator Facilities
by Anıl Karatay

July 2020

An overview of FBG-assisted Phase-OTDR Techniques presented at ICTON’2020 

An invited talk was given by Dr. Kıvılcım Yüksel Aldoğan about Recent Advances in FBG-assisted Phase-OTDR technique and its applications.

The 22nd Conference on Transparent Optical Networks (ICTON) was held in remote online version due to Covid-19 pandemic.


June 2020

Şamil Şirin gave a research seminar on fiber optic current sensors

Şamil Şirin realised his Master Thesis Proposal seminar June 26 2020, 11:00am.

Project title is “Development of a Simulation Tool for Fiber Optic Current Sensors”.

March 2020

Arda Şahin has been awarded TÜBİTAK 2209 support

Arda Şahin has been awarded TÜBİTAK 2209 support (research project supporting programme for university students) with his project called “Data Communication System Between Two Devices Through Visible Light Spectrum”.

The project is consulted by Dr. Kıvılcım Yüksel Aldoğan and aimed to enhance the performance parameters of a Li-Fi (Light Fidelity) prototype previously developed at the Department. Second aim of the project will be implementing a Medium Access Control to increase the number of users supported by the system.

February 2020

Our paper has been accepted for a poster presentation at the International Conference on Optical Fiber Sensors (OFS 2020)

Combined Effect of Multi-Reflection and Spectral Shadowing Crosstalk in Phase-OTDR System Using Fiber Bragg Grating Array. 

The multi-reflection crosstalk when combined with the spectral-shadowing effect has been shown to make the interpretation of spectral analysis more difficult in Phase-OTDR sensing system based on weak fiber Bragg grating array.

The International Conference on Optical Fiber Sensors (OFS), established in 1983, is acknowledged as the world’s leading conference on all topics related to photonic sensing technologies. OFS provides a forum for reporting and exchanging ideas on the latest advances in research and development on fiber-optic and photonic sensing.

January 2020

Şamil Şirin joined EE Department and our Lab as research assistant

Şamil Şirin completed the B.S. degree in 2019 in İzmir Institute of Technology, Electronics Engineering Department.

He is currently pursuing a master degree and working as a research assistant.

December 2019

Ligth Fidelity (Li-Fi) demo realised 

Li-Fi Prototype has been successfully designed and implemented by Florent Dransart (HELHA, Belgium) in the framework  of Erasmus student exchange programme. 

Set-up demo video:

December 2019

We participated to Technology Days organised by Izmir Universities Platform 

November 2019

Şamil Şirin gave a talk on “Development of a simulation tool for vibration sensors based on Phase-OTDR interrogator” at ASYU’2019

November 2019

​Dr. Yüksel Aldoğan organised and chaired a special session at ASYU’2019 

Conference on Innovations in Intelligent Systems and Applications (ASYU 2019) was organized by Yaşar University, in cooperation with Yildiz Technical University. The topics of interest mainly cover Artificial Intelligence, Deep Learning, Fuzzy Logic, Smart Systems, Machine Learning, and Data Mining. 

July-August 2019

Dr. Yüksel Aldoğan was at UMONS (Belgium)

A fruitful collaboration  was realised on the interrogation of FBG sensors by Phase-OTDR.

June 2019

Tubitak 2209-A Grant obtained for three graduation projects

Hazal Kahraman, Şamil Şirin and Onur Ateş completed their projects supported by TÜBİTAK 2209 Grant Program for undergraduate students. 

October 2019

Ertunga Burak Koçal joined EE Department and our Lab as research assistant

Ertunga B. Koçal completed the B.S. degree in 2018 in İzmir Institute of Technology, Electronics Engineering Department.

He is currently pursuing a master degree and working as a research assistant.

June 2017

Dr. Yüksel Aldoğan’s project proposal for TUBITAK BIDEB-2219 International Postdoctoral Research Fellowship Program was granted 

In the framework of this collaboration with UMONS, Development of a phase-OTDR interrogator based on coherent detection scheme was accomplished.

The short-term mission blossomed significantly and we have published the results, in the form of journal paper and conference presentations.


October 2016

Dr. Yüksel Aldoğan became an academic board member of Photonics Department of IZTECH

October 2012

Dr. Yüksel Aldoğan became an academic collaborator of Electromagnetism and Telecommunication  Department of Mons University (UMONS, Belgium)