Jose Miguel López-Higuera
University of Cantabria, CIBER-BBN and IDIVAL, Spain
KEYNOTE TITLE: Healing with light: The potential of photodynamic therapy
Prof. López-Higuera is the founder and head of the Photonics Engineering Group of the University of Cantabria, CIBER-BBN of the Instituto de Salud Carlos III and IDIVAL of Hospital Universitario Marqués de Valdecilla, Spain. He is a Member of a wide set of international Committees of Conferences, R&D Institutions, and Companies in the area of photonic sensing. His work is focused on optical sensor systems and instrumentations for any sector application. He has worked in a wide range of R&D&i projects, acting in more than 90 of them as manager. He has contributed with more than 700 research publications including 20 patents closely related to optical and fiber techniques for sensors and instrumentations. He has worked as an editor and co-author of four R&D international books, as a co-editor of several conference proceedings and Journals and he has been the director of 18 PhD theses. He is co-founder of three technology-based companies. Prof. López-Higuera is a Fellow of OSA, Fellow of SPIE, Senior of IEEE and a Member of the Royal Academy of Medicine of Cantabria, Spain.
Light Science and Technologies (Photonics) now touches almost every area of our lives including the healing and health care one. To provide the health and care services required in this period of our lives, new breakthroughs and new cost-effective methods for improved diagnosis, and therapy are very welcome.
In this talk, we will explore the potential of healing of a treatment activate by light to overcome cancer, pre-cancer and chronic diseases: the Photodynamic Therapy (PDT). PDT, offers a localized treatment against cancer and infectious lesions, by using specialized compounds or photosensitizers (PS) activated by Light to produce disease killing Reactive Oxygen Species (ROS). These, can directly damage cells and/or vasculature, with little damage to surrounding tissue, and also could produce the indirect effect of alarming the immune system against the specific cancer.
In this invited keynote, after the clarification of what can be understood as Photodynamic Therapy how it does work and devices required, several significant cases will be presented and discussed. Then, the potential of PDT to be used alone or “harmonically” combined with the already commonly used “standard” therapies to reach a higher or better level of healing, will be mentioned in the presentation. After that, the attendees will be aware of the of power of healing with this light based therapy and its significant impact on the modern medicine of XXI century.
Maxim S Pshenichnikov
University of Groningen, Netherlands
KEYNOTE PRESENTATION: Lab-on-a-chip Spectroscopy: Learning the structural complexity
Maxim S. Pshenchnikov obtained his PhD from Moscow State University in 1987. In 1992, he moved to the University of Groningen, the Netherlands, as a postdoctoral fellow, to join the staff in 1996, first at the department of chemistry, and since 2006 at the department of physics. In the early 90s, he began to design experiments and theoretical description of femtosecond spectroscopy on liquid state dynamics. He with co-workers was the first to report time-gated and heterodyne-detected photon echoes from solutions. The technical aspects of this work culminated in 1998 with the Guinness Book of World Records certificate awarded for “The shortest flashes of light produced and measured, lasted for 4.5 femtosecond”. Later, his research was focused on hydrogen-bond dynamics in liquids and at (bio)interfaces. He published 150+ papers in international journals and 6 chapters in books, which altogether received more than 4800 citations (h-index 37). He organized and co-chaired a number of international meetings in the fields of spectroscopy, organic electronics and excitonics. Since 2016, he is also a visiting professor at Nanyang Technological University, Singapore.His current research interests cover a wide range of ultrafast phenomena in organic materials at nanoscopic lengths and ultrafast time scales, with the focus on exciton and charge dynamics in energy-related and bio-inspired materials.
The natural light-harvesting antennae of plants and photosynthetic bacteria are one of the most fascinating functional molecular nanoassemblies. Their unprecedented quantum efficiency relies on the strong coupling between thousands of densely packed chromophores giving rise to highly delocalized excitons which travels over long distances. However, the structural complexity of these systems leads to spectral congestion thereby blurring individual exciton transfer pathways that are vital to unravel for potential applications. Artificial model systems allow for better understanding of the structure-property relationship through reducing the complexity of natural light-harvesting complexes and disclosing the working principles to the basic elements.
Here we demonstrate a novel spectroscopic/microfluidics approach to deconvolute the supramolecular hierarchy of the model system, multilayered nanotubes. The outer shell is selectively unwrapped in a microfluidic cuvette thereby providing a sufficient time window for ultrafast spectroscopy, before the original structure is re-established. We will also discuss the intermediate dynamical states of self-assembly by combining microfluidics, ultrafast two-dimensional spectroscopy, and extensive computer simulations.
Manish D Kulkarni
Diagnostic Solutions & Systems, USA
KEYNOTE PRESENTATION: Next generation ophthalmic imaging
Manish is also the CEO of Diagnostic Solutions & Systems (DiagSoSys), whose mission is to accelerate innovation and product development while simultaneously, shrinking "the cost to market" for complex products. Manish has a strong experience in developing high performance biomedical imaging & sensing systems. Manish holds 10 issued and 5 pending US patents, and has published 2 book chapters & 35 articles. Prior to starting DiagSoSys, Manish was working at KLA-Tencor, where he developed high yield mask-inspection-systems for semiconductor manufacturing. Manish also worked at Carl Zeiss Meditec, where he developed optical coherence tomography, a novel medical technology for sub-surface micron-resolution imaging. Manish has a PhD in Biomedical Engineering from Case Western Reserve University, a MS in Physics from Michigan Tech and a BTech from Indian Institute of Technology, Bombay.
Eye disorders and vision loss are among the costliest conditions to the global economy. The population in developed countries suffering from eye diseases is increasing due to demographic trends & higher incidence of diabetes. Growing middle-class in emerging markets require a high quality & affordable solution. Ophthalmologists and optometrists lack a reliable early-diagnostic device for disease diagnosis. Typical methods provide diagnosis only after the eye has suffered irreparable damage. Optical Coherence Tomography (OCT) has revolutionized ophthalmic diagnostics. We are developing a next generation OCT based disruptive technology for early diagnostics of ocular pathologies such as macular diseases, diabetic retinopathy, and glaucoma. Our OCT based devices could diagnose diseases before the onset of irreversible vision loss by providing ultra-high resolution images & real time retinal blood circulation maps. We will present an overview of the current advances inophthalmology as well as our innovative solutions.
Weizmann Institute of Science, Israel
KEYNOTE TITLE: Long-range optical interactions
Will be updated shortly
Nonlinear optical phenomena are typically local. We have predicted the possibility of highly nonlocal optical nonlinearities mediated by long-range interactions of photons propagating in atomic media [Shahmoon et al.]. Part of our predictions has concerned the possibility of entangling photons in waveguides that has recently been experimentally confirmed by M.Lukin’s group. It has grown out of our work on the enhancement of long-range interactions by virtual quanta exchanged via the bath in confined geometries [Friedler et al.]. It is at present the only mechanism capable of deterministically entangling distant photons. This mechanism is one of our predictions of bath-induced entanglement [Rao et al.]. Its essence is that the mediation of virtual quanta by the modes of a waveguide can cause their enhancement by many orders of magnitude and drastically extend their range [Shahmoon et al.].
For atoms trapped near a nano-waveguide, where long-range interactions between the atoms can be tailored in an electromagnetically-induced transparency configuration, the atomic interactions may be translated to long-range interactions between photons and thus to highly nonlocal optical nonlinearities. We find a roton-like excitation spectrum for light [O’Dell et al.] and the emergence of order in its output intensity.
For atoms coupled to a waveguide with a bandgap spectrum illuminated by an off-resonant laser, the resulting dynamics of the atoms is predominantly affected by an extremely long-range conservative force that can enhance their interaction.
Even more dramatic, giant, enhancement of the interaction is achievable via the control of the geometry, for dipolar forces induced by the electromagnetic vacuum, namely, the Casimir and van der Waals (vdW) forces. The idea is to consider atoms coupled to an electric transmission line (TL), such as a coaxial cable or coplanar waveguide, which support the propagation of quasi-1d transverse electromagnetic (TEM) modes. Virtual excitations (photons) of these extended modes can mediate much stronger and longer-range Casimir and vdW forces than in free-space [Shahmoon et al.].These predictions open the door to studies of unexplored wave dynamics and many-body physics with highly-nonlocal interactions of optical fields in one dimension.
Bekir Sami Yilbas
King Fahd University of Petroleum and Minerals, Saudi Arabia
SPECIAL SESSION: Laser texturing of alloy surfaces towards self-cleaning applications
Bekir Sami Yilbas obtained his PhD degree in Mechanical Engineering from Birmingham University in UK in 1982. He worked and affiliated with various universities and some of these include The University of Birmingham, Glasgow University, Erciyes University, University of Ontario Institute of Technology, Korean Institute of Science and Technology, Massachusetts Institute of Technology, and others. He is currently a Distinguished University Professor at King Fahd University of Petroleum & Minerals in Saudi Arabia. His research area covers laser machining and applications, surface sciences and engineering, thermal processing, and energy materials. He published over 800 papers in international journals and presented over 100 papers in conferences. He received many awards over the years due to his scientific achievements. Some of these include President of India’s Prize for 1988, the best researcher awards from KFUPM (1997, 2002, 2007), Silver Jubilee Medal for the outstanding achievements in Materials and Manufacturing 2005 by Silesian University of Technology, Poland, Doctor of Engineering Degree from Birmingham University (2005), Donald Julius Groen Prize for 2007 from by Institution of Mechanical Engineers (IMechE), Manufacturing Industries Division, UK, Professor W. Johson International Gold Medal for 2008 by awarded by the Advances in Materials and Processing Technologies Steering Committee. Professor Fryderyk Staub Golden Owl Award by World Academy of Metals, and Almarai’s Distinguished Scholar Prize, awarded by King Abdulaziz City of Science and Technology in Saudi Arabia. He contributed to teaching and training of many graduate students in Mechanical Engineering and related fields.
Texturing of surfaces remains critical for self-cleaning applications. In the present study, laser gas assisted and repetitive pulse treatment of various alloy surfaces is presented towards achieving the surface texture characteristics composing of hierarchal micro/nano pillars. The resulting surface texture characteristics and wetting state are analyzed using the analytical tools. The surface energy of the laser treated surface is determined adopting the contact angle method. It is demonstrated that laser repetitive pulse treatment results in the combination of melting and ablation at the surface. This in turn forms hierarchal micro/nano pillars distribution on the surface. The wetting state of the laser treated surface remains mostly in hydrophobic; however, some surfaces become hydrophilic because of the large gap size between the micro/nano pillars. The surface free energy of the laser treated surface is similar to that corresponding to those corresponding to commercially produced nitride or oxide coating surfaces.
Lumentum & University of Texas at Dallas, USA
(CONTINUATION) 2nd DAY SHORT COURSE FOR 3 HOURS: High-Speed Optical Transceiver Technology for Data Centers
Dr. Ricardo Saad is presently an R&D Director at Lumentum (spin off from JDSU). He is also a faculty in the Department of Electrical Engineering at the University of Texas at Dallas (UTD). He has been at UTD since 2001. At Lumentum he is presently responsible for the research and development of high-speed optical transceivers for datacenters. He previously work in high-speed tunable transceivers. Dr. Saad has worked for over 25 years in engineering and managerial roles in the development of optical transceivers and subsystems at Alcatel (now Nokia), Tellabs, Finisar, Avanex, Menara Networks, Xtera Communications, JDSU and Harmonics. At UTD, he lectures graduate and undergraduate courses in RF & Microwaves, Optical Communications, Optical Transceiver Design, Analog Circuits, Electromagnetics, and Advance Mathematics.
Dr. Saad has over 20 papers in conferences and journals and he has written two chapters in books. He holds 6 US patents in optical transceiver technology and Raman amplifiers. He was the recipient of the instructor of the year awards in the Department of Electrical Engineering at the University of Texas at Dallas in 2010 and 2013.He received the Ph.D. degree in Electrical Engineering from the University of Toronto in 1996, the MSEE from the University of Campinas, Sao Paulo, Brazil in 1989, and the Diploma in Electrical and Electronics Engineering from the National University at Cordoba, Argentina in 1986.
High-speed optical transceivers are one of the key technologies in the development of modern optical communications systems. The demand for more bandwidth due to the high growth on internet traffic has generated the need for optical transceivers that work at very high speeds. Optical transceivers operating at 400 Gbs and 1 Tbs will be deployed in the near future. Microwaves and high-speed optoelectronics are key technical areas for the development of the next generation optical transceivers. This short course introduces fundamental concepts of high-speed optical transceivers. Topics are presented in a step-by-step approach starting from fundamental electrical engineering concepts. Optical communication concepts are introduced at the beginning of the course to highlight the different applications and requirements for optical transceivers. The operation of key components such as high-speed photodiodes, lasers, electro-absorption and Mach-Zehnder modulators, transimpedance amplifiers, and drivers are introduced from a practical viewpoint. Different optical transceiver architectures and their corresponding implementations are presented. Design and characterization techniques of optical transceivers are reviewed. Impairments on optical transceivers are highlighted. The course concludes presenting different state-of-the art optical transceivers for multiple applications including optical transceiver for data centers.
Fundamental of Optical Communications
- Multimode and single mode fibers
- Multimode and Chromatic dispersion effects.
- Dispersion compensation using optical fibers.
- Attenuation on optical fibers.
- Different bands in optical fibers: O-band, S-band, C-band, L-band.
- Standard optical frequencies in optical communications.
- Non-linearities in optical fibers.
- Brief description of optical amplifiers
- Basic optical communication system configurations
Optical Transceiver Architecture
- General Architecture of Optical Transceivers
- Multisource Agreement Form Factors.
- Photodetection Process
- Responsivity, quantum efficiency, dark current definitions.
- PIN Phododetector: operation, electrical model
- Avalanche photodetectors (APD), operation, electrical model.
- PIN and APD photodetectors specifications.
- Characterization of photodetectors.
- Examples of commercially available photodetectors.
Modeling of Optical Receivers
- Noise in electronic circuits.
- Noise in linear circuits.
- Noise theory applied to optical receivers.
- PIN noise model.
- APD noise model.
- Basic architecture of optical receives.
- Bit error rate, Q-factor definition.
- Relationship between sensitivity and extinction ratio, noise, and bit error rate.
- Effect of threshold adjustment on the performance of optical receivers.
- Effect of finite rise time in optical receiver sensitivity. Optical dispersion effect.
- Basic configuration of optical receivers
- Main specification of optical receivers
- Receiver Optical Sub-Assembly (ROSA ) examples.
Transimpedance Amplifier- Post Amplifiers
- Transimpedance amplifiers (TIA) specifications
- Linear transimpedance amplifier-Automatic Gain Control (AGC)
- Limiting transimpedance amplifiers (LA)
- Architectures of transimpedance amplifiers
- FETs and BJT front-ends for transimpedance amplifier.
- Post-amplifier specifications
- Examples of commercially available TIAs, LA and AGC amplifiers.
- Absorption, spontaneous emission, andstimulated emission
- Fabry-Perot cavity.
- Principle of operation of lasers.
- Fabry-Perot laser operation
- DFB and DBR laser operation
- VCSEL operations
- Tunable laser operation
- Examples of commercially available lasers.
- Architecture of optical transmitters
- Transmitter specifications
- Direct modulated transmitters
- External modulated transmitters: Electro-absorption and Mach-Zehnder modulators.
- RF & microwave drivers for optical transmitters
- Transmitter utilizing thermo-electric coolers/heaters.
Optical Transceiver architectures for different Form factors
- Multisource Agreements (MSA) for 10 Gbs transceivers
- Architecture and operation of10 Gbs optical transceivers
- Examples of 10 Gbs optical transceivers.
- MSAs for 100 Gbs transceivers
- Architecture and operation of 100 Gbs optical transceivers.
- Effect of dispersion on bit error rate performance.
- Transceivers under low optical signal to noise ratio: effect on the BER performance.
- Optical transceivers with clock data recovery (CDR)
- Optical transceivers with forward error correction (FEC)
Test Methodologies for Optical Transceivers
- Optical characterization
- Electrical characterization
Impairments in Optical Transceivers
- Optical impairments
- Electrical impairments
Application for Optical Transceivers
- Datacom and data centers
- Passive Optical Networks.
- Examples of optical transceiver for different applications.
Importance of this short course:
High-speed optical transceivers are presently working at microwave frequencies. In the next few years, 400 Gbs and 1 Tbs optical transceiver will be developed due to the demand of more bandwidth for internet applications. As such high-speed electronic (RF & Microwaves) components will be developed. The development of those components required RF & Microwave knowledge as well as a detail understanding of high-speed optoelectronics. Presently, some major Microwave-core companies are designing microwave components for high-speed optical transceivers. In general, there is not a full understanding within microwave companies on what to develop for the next generation optical transceivers. Also, optoelectronics components do not have a clear understanding on the capabilities of microwave technology. This is because standard electrical engineering curriculum does not integrate both areas of electrical engineering. The main objective of this course is to introduce to the attendees the fundamentals topics related to optoelectronics and high-speed optical transceiver.
Previous Experience teaching short courses:
He taught short courses (1-week long each) on high-speed optical receivers and high-speed optical transmitters (as separate topics) and on optical communications for Finisar corporation engineers in Ipoh, Malaysia, between 2006 and 2009. He had also given some lecturers on optical transceivers at JDSU (now Lumentum) in an effort to train engineering resources of the company. He also created and lectured once a year a graduate course on high speed optical transceivers (EEOP6338 High-Speed Optical Transmitters and Receivers) since 2013 in the Department of Electrical Engineers. The objective of the course is to prepare engineers that are capable to understand high-speed optical transceiver technology which requires a deep understanding in communications, optoelectronics, and RF & Microwaves. A similar course to the one that he is proposing was taught at IEEE International Symposium in Microwaves, May 2016 in San Francisco. This was an invited short course by the Short Course Committee.
Short Course Learning Objectives and Outcomes:
- Ability to understand optical communications concepts related to optical transceiver design.
- Ability to understand high-speed optical receivers circuits and architectures
- Ability to apply noise theory to optical receivers and its relationship with sensitivity.
- Ability to understand different photodetectors and its application in optical transceivers
- Ability to understand transimpedance, limiting and AGC amplifiers.
- Ability to understand high-speed optical transmitter circuits and architectures.
- Ability to understand different laser types and their operations and applications.
- Ability to understand internal and external modulation in optical transmitters (i.e. electro-absorption and Mach-Zehnder Modulators).
- Ability to understand impairments in optical transceivers.
- Ability to understand latest technologies in the design of high-speed optical transceivers.
Method of Presentation:
The short course is presented using Power Point slides. Some videos or demonstrations in internet are presented to complement the material. The material is presented assuming no prior knowledge of the audience on optical transceivers. As such, fundamental material relevant to optical transceivers is presented in step-by-step approach. Since he has been working in (and also teaching) these technologies for many years, he has a sense on the difficulties that attendees without prior experience in optical transceivers may have. The material is presented in a clear and systematic approach. Fundamental concepts are introduced first, and then it is followed by basic applications and then, once the attendees have a clear understanding of the topics under discussion, state-of-the art applications are introduced.
Material to be distributed to the Attendees:
Copies of the slides presented in the course are available to the attendees. That material can be either provided as a hardcopy or softcopy. He believes hardcopy versions are more efficient since attendees can take notes for each slide. For the hardcopy version of the slides, he recommends one slide per page with space (about ½ page) for the attendees to take notes. He is flexible on this to attend the requirements for short courses of the conference.
Chunchao Qi and Xinhui Tan
China Communication Technology Co., Ltd, China
WORKSHOP TITLE: All-fiber terahertz time domain spectroscopy system
Dr.Chunchao Qi joined China Communication Technology Co., Ltd (CCT) in 2015and was promoted to vice president in 2018. Prior attending CCT, he was a senior engineer at the Southern University of Science and Technology (SUSTech). He received his PhD from the Huazhong University of Science and Technology. He is a senior member of OSA and was selected for the National Science and Technology Programmes Expert Database of China. His primary research interests lie in the field of terahertz sources, quasi-optical devices and semiconductor carrier lifetime measurement. Recently,Dr. Qi focuses on millimetre/terahertz wavespectrum and imaging. He has published 14 papers indexed by Science Citation Index (SCI) and held 46 patents (licensed).
Terahertz time domain spectroscopy (THz-TDS) has been proved particularly valuable in the field of semiconductors characterization, molecular spectroscopy, and biomedical applications. THz-TDS system is becoming more flexible, more stable and low-cost. In this work, we present an all-fiber THz-TDS system which mainly consists of a 1560nm fiber femtosecond laser, a highly accurate PZT fiber stretcher, and fiber-coupled InGaAs/InAlAs photoconductive antennas (PCAs). Using polarization maintaining dispersion compensation fiber (PMDCF), the pulse widths of the laser at the ends of PCAs were compressed to less than 100fs with 3dB bandwidth about 50nm after 46-meter polarization maintaining (PM) fiber propagation. Time delay accuracy was enhanced owing to the stretching length calibration of the fiber stretcher. Thus, our system can achieve 80ps scan range, 40dB peak dynamic range (for a scan). This all-fiber THz-TDS system is portable, compact, and suitable forindustrial environment and fieldapplications.
Fig. The schematic diagram of the all-fibered THz-TDS system
Fraunhofer IZM Berlin, Germany
ORAL PRESENTATION: Stacked glass block connectors for high power photonic modules
Vanessa Zamora completed her PhD in Physics at the University of Valencia, Spain, on “Cylindrical Optical Microresonators” in 2010. She joined the Fraunhofer IZM and TUB as project manager since 2013. At IZM Dr. Zamora’s research cover state-of-the-art and forward looking fiber interconnect technologies,assembly and packaging strategiesfor optical sensors, especially planar and 3D optical microresonators. She is involved in national and European projects like BMBF-EU Chip-SCG, ZIM-SaltWaist, BMBF-EU PoC-BoSens, EU-PHOCNOSIS, among others.
Recent advances in lasing and sensors drive towardscontinuous the development of miniaturized devices with capabilities in terms of low cost, reliability, multifunctional operation and low power consumption. The photonicintegrated circuit platform is an excellent candidate due to its unique features such aslarge-scale production and high integration degree of complex optical functions into a small chip. Such photonic chips based on nano-sizedwaveguides have beenrecently investigatedfor the development of compact high-power laser sources. However, a high efficient and stable fiber optic interface is necessary to connect the photonic chip tothe outside world.
In this letter, a stacked glass block technology has been investigated in combination with a fine alignment methodin order to develop robust fiber connectors. They are used tocouple light laterally to the photonic chip. This technology avoids undesired misalignments thanks tothe high-freedom assembly method of glass parts and the almost zero gap between two glued parts. Figure 1 showsthe single-mode fiber connector design composed by 4 stacked glass pieces and 1 ceramic ferrule.Byusing an automated laser processing system, small glass parts from glass panels were cut with high reproducibility and acceptable roughness tolerances. For fiber-to-fiber coupling, two fiber connectors were assembled and tested with a CW laser source at 1550 nm and 4 mW power. A transmission loss value of about 0.5 dB was found after UV curing. Temperature measurements were also carried out from room temperature to 75°C, generating an increase in optical losses of 0.3 dB.For fiber-to-chip coupling, thermal simulations of the module were performed with active cooling. By applying 0.1W power, a temperature change of 0.1°C is obtained resulting this effect negligible. First results show that stacked glass connectors are promising tools for interconnecting high power photonic devices.
Universidad Nacional de Colombia, Colombia
ORAL PRESENTATION: Phase quantification techniques for to study biological samples
Freddy Alberto Monroy-Ramirez being Doctor in Physical Sciences the National University of Colombia with the thesis titled Digital Holographic Microscopy of phase objects. The main topic of research of Professor Monroy has been framed within the Digital Holography Microscopy (DHM), the micro-holo-tomography (a technique that combines DHM with tomography) and lately, has explored in other phase quantification techniques, such as diffraction phase microscopy and point diffraction interferometry. Among the most important applications in which he has directed his research are palynology, working with mouse peritoneal macrophages and diagnosis of Brazilian Leishmania, as well as he has focused on the study of blasts in human peripherical blood, to diagnostic acute lymphocytic leukemia. Currently, he is an associate professor in the Physics Department of the National University of Colombia in Bogotá.
In this talk, we present some advances about the work in the Applied Optics Group (AOG) of the Physics Department of the National University of Colombia in Bogotá. As an application of off-axis split beam systems to obtain the phase quantification images (PQI) in the AOG, the Digital Holographic Microscopy (DHM) technique was initially implemented, with which applications have been developed in two directions: initially were carried out palynological studies for the characterization of pollen grains of several species and families, measuring the thicknesses of their exine and nexin layers, and their respective refractive indexes, giving the palynologists new parameters for the taxopalinology. On the other hand, the morphometric and refractive index variations suffered by macrophages were studied when they were infected by the Leishmannia Brazilensis virus at different times of infection. As an application of off-axis and common path systems, the Diffraction Phase Microscopy (DPM) technique is currently being implemented, which has the characteristics of requiring only one record and with the quality of being mechanically very stable, since DPM uses a compact Mach-Zehnder interferometer to combine several attributes of the current PQI methods. With this technique, the study of human blood is being initiated in which blasts are being identified from the morphometric characterization of the peripherical blood cell population, for the diagnosis of acute lymphocytic leukemia. On the other hand, as an application of phase shift techniques, we are implementing the technique of the Point Diffraction interferometer (PDI), which, with the principle of Gabor's holography, has the main characteristic of using a monopixel liquid crystal display and perform a digital phase shift to the wave that carries the information of the object; with this technique, micrometric objects have been initially described and progress is made towards the study of biological samples.
Jawaharlal Nehru Govt. Engineering College, India
ORAL PRESENTATION: Peak to average power ratio (papr) reduction in wireless system in fading channels
Himanshu Monga Obtained PhD from Thapar Institute of Engineering and Technology, (TU) , Patiala, Punjab, INDIA, (2014) in the field of Optical networks / coding and Wireless networks. He obtained his bachelor’s degree from Govt. Engineering College, Amravati University, Maharashtra, India and Master’s degree Engineering & Masters degree in management in Human resource management. Presently, he is working as Director/Principal in Jan Nayak Chaudhary Devi Lal Lal Vidyapeeth, Sirsa. Before this he served as Professor and Dean Research in Lovely Professional University, Phagwara, India. He possess work experience of 19 plus years in academics and industry/research. He has authored more than 130 Research papers in international/national conferences. Have more than 100 UGC approved journal publications, this includes 30 + Thomson Reuter SCI/SCOPUS indexed publications to my credit. He is the life member of IEEE, ISTE and reviewer of many renowned journals. He authored 08 Books/ chapters in renowned books. Have successfully completed 06 projects worth Rs 70 Lacks and successfully completed many consultancy projects. I have delivered invited talk to various institutions and industries too. He is responsible for developing and facilitating innovative, progressive, faculty-led programs of research. He is accountable for ensuring that the research programs and activities of the College are conducted in a creative, efficient, and ethical manner, consistent with the rules and regulations of the affiliating University/Vidyapeeth. He occupies a unique place in the continuum of academic administrators, as the facilitating link among Department Heads, faculty members, staff, students, and University leadership. All activities and roles undertaken in light of furthering the best interests of the students.
Lower peak-to-average power ratio (PAPR) in the wireless communications greatly benefits the mobile terminal in terms of transmitter power efficiency and reduced cost of the power amplifier. This work can be used especially for wireless transmission in future mobile communication systems where transmitter power efficiency is of paramount importance.
In wireless communications lower peak-to-average power ratio (PAPR) greatly benefits the mobile terminal in terms of transmit power efficiency and reduced cost of the power amplifier. SC-FDMA's additional advantage of low PAPR makes it a favourite, especially for wireless transmission in future mobile communication systems where transmitter power efficiency is of paramount importance.
Our work deals with PAPR reduction in SC-FDMA with STBC and Turbo Filter. Here we use the Partial Transmit Sequence (PTS) technique to reduce the PAPR and compare the experimental results of PAPR of SC-FDMA with STBC and PAPR of SC-FDMA without STBC over multipath fading channels. The BER performance of the proposed system is also compared with SC-FDMA without STBC ( Space Time Block Codes).
Hazara University, Pakistan
ORAL PRESENTATION: Evaluation of plasma parameters and elemental analysis of nanoparticles of SiO_2, SiO_2 CdTiO_3, CoTiO_3 using laser induced breakdown spectroscopy
The purpose of this experimental work is to evaluate the elemental and percentage composition of the samples and also to study the effect of laser energy on plasma parameters such as electron temperature and electron number density. In order to analyze the elemental composition and percentage composition of samples, laser induced breakdown spectroscopy (LIBS) is used in this research work. The samples silicon dioxide (), silicon dioxide cadmium titanium trioxide ( and cobalt titanite ( are firstly prepared in the form pellets and then these are used in LIBS setup. All the possible peaks are analyzed and area under such peaks is found for these samples. Intensity ratio method is used to calculate elemental concentration of samples which shows different elements of different percentages are found in the samples. The plasma parameters like electron number density and electron temperature are also calculated from stark broadening and Boltzmann plot method.
Shahid Beheshti University, Iran
ORAL PRESENTATION: High power 1018 nm fiber laser using low core/cladding ratio of20/400 µm Yb-doped fiber with output of 472 W
Hossein Fathi received the BS degree in Solid state physics from Zanjan University, Zanjan, Iran, in 2010, the M.S. degree in optics from the Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, Iran, in 2013. His research interests include high power fiber lasers, fiber amplifiers, optical communication, applied optics, and interferometry. He is a member of Iranian Optics and Photonics Society.
In recent years, ytterbium-doped fiber lasers operating at around 1018 nm have attracted considerable interest for their capability to be used as the pump source in multi-kilowatt fiber lasers. There are several challenges to realize the high power 1018nm fiber laser, the most prominent is suppressing the amplified spontaneous emission at the range of 1030-1060 nm. In this paper, we report our experimental results of a high power monolithic 1018 nm fiber laser by employing a low core/cladding diameter ratio active fiber of 20/400 μm. 472 W of output signal power with beam quality factor of M2=1.17 and slope efficiency of ?=49.4 % has been achieved. To the best of our knowledge, this is the highest reported output power and efficiency and best beam quality in developing a 1018 nm Yb-doped fiber laser via these low core/cladding diameter ratio YDFs. To realize the setup, the effects of the characteristics of the experimental elements- reflectivity of the output coupling fiber Bragg gratings, length of the active fiber, etc. - over the output behavior of the system have been investigated
Azarbaijan Shahid Madani University, Iran
ORAL PRESENTATION: Supercontinuum genertaion by amplilification of noise-like pulses in nonlinear yb-doped fiber amplifier
Ebrahim Aghayari was born in 1981 in Zanjan, Iran. He received his BSc in condensed matter physics from Azarbaijan Shahid Madani University, Tabriz, Iran in 2005. He recievied MSc degree in photonics from Tabriz University, Tabriz , Iran. His is currently with Iranian National Center for Laser Science and Technology and also works toward his PhD thesis on ultra-short mode locked fiber lasers in Azarbaijan Shahid Madani University. He is interested in nonlinear phenomena in fiber amplifiers, mode locked fiber lasers and coherent beam combining.
In this paper, we report on a supercontinuum generation by amplifying noise-like pulses (NLP) in a nonlinear Yb-doped fiber amplifier. The NLP source is a homemade Yb-doped all-fiber ring resonator mode-locked by nonlinear polarization rotation method. Noise like pulses possess repetition rate of 11.57 MHz, energy of 16.5 nJ and 3dB spectral bandwidth of 40 nm. Intensity autocorrelation function of NLP has a broad pedestal and a narrow central spike. The pedestal and the spike have temporal widths (Gaussian fit) of 77 ps and 100 fs, respectively. The NLPs are amplified by a Yb-doped fiber nonlinear power amplifier to achieve output power of 7.2 W. Nonlinear effects in amplifier drastically broadened the spectrum of NLPs and generated high power supercontinuum light with 10 dB spectral width of 1130 nm (from 1037 nm to 2167 nm). The presented supercontinuum generation system is an all-fiber compact structure and has an advantage that does not require nonlinear fiber.
University of Tlemcen, Algeria
ORAL PRESENTATION: Effect of porous silicon carbide on the resonant coupled modes in a multilayer sensing nanocavity
B. Benamar joins the University of Tlemcen (Algeria) as an Assistant Professor in the Department of Physics. The author was a teacher of Physics at the University of Tlemcen for the undergraduate students. The primary research interest of the author was in the field of Van der Walls interaction between atom-surface in high resolution. The motivation of the author has been oriented towards the plasmonic nanostructured devices and their applications in biosensing. In addition, the author supervises thesis works for the students and helps them to develop numerical programs in Fortran. In the free time, the author practices tennis.
To quantify fundamental features of the optical coupling between incident photons and surface plasma oscillations, various types of metallo-dielectric interfaces were intensively investigated. In the interest to further enhancing significantly the sensitivity of the occurred transfer energy, in consequence, advantages of graphene and MoS2 layers were already been highlighted in several papers of the literature. In this contribution, we focus on another active material to substantiate the sensitivity of a designed biosensor that possesses the ability of sustaining efficiently electromagnetic field generated during the coupling process by tuning structure’s parameters in the sub-wavelength scale. To solve the sensitivity issue, porous silicon carbide (P-SiC) has been considered between a glass-substrate of high refractive index and a nanostructured cavity (three stacked layers referred as MIM-waveguide). To understand the effect of porosity, the response of the proposed device is simulated by the transfer matrix formalism and where the optical property of P-SiC is described according to the effective index theory (EIT). Thus, to evaluate the overall limit on the sensitivity, deduced from the angular-response probed on the sensing device, two types of models including the porosity are considered. In this theoretical analysis, all thicknesses, of the media involved, are optimized and the sensitivity was determined on both the change of refractive index of the sensing medium, I (surrounded by active materials) and its thickness. Finally, according to the results described on the electromagnetic field, the multilayer sensor, based on the property of P-SiC, can be used as a suitable sensing platform to explore and confine efficiently resonant interface phenomena.
M. L. V. Textile & Engineering College, India
ORAL PRESENTATION: Few-mode erbium doped fiber amplifier for space division multiplexing based optical communication system
Ankita Gaurhas her expertise in the designing of few-mode erbium doped fiber amplifiers. She has designed the fiber amplifiers for space division multiplexing based optical communication system and high power applications. She has completed her post-graduation and Ph.D. degrees from Indian Institute of Technology Roorkee, India. Currently, she is working as Assistant Professor in M. L. V. Textile &Engineering College, Bhilwara, India.
Statement of the Problem:
Few mode fiber (FMF) based space division multiplexing (SDM) technology is the promising solution of capacity crunch issue . To allow the simultaneous amplification of all signal mode groups of FMF, it is necessary to design a few-mode erbium doped fiber amplifier (FMEDFA). The major challenge in the designing of FMEDFA is the gain equalization (i.e.zero differential modal gain (DMG)) without any mode coupling.
Methodology & Theoretical Orientation: We propose a trench-assisted ring-core EDFA (as shown in Fig. (a)). The simultaneous amplification of 18 modes of five mode groups has been studied using this fiber with ring doping and fundamental mode pumping. Transfer matrix method has been used for mode profile calculation . Gains and DMGs of FMEDFA have been calculated through the mathematical modelling given in Ref. .
Findings: Fig. (b) shows that more than 20 dB amplification with less than 1.32 dB DMG and mode spacing ?neff> 4.9× 10-4 is achieved for fiber length > 2.8 m. Fig. (c) shows that on introducing the trench of width 4 µm,more than 20 dB amplification with less than 0.45 dB DMG and?neff> 5.1 × 10-4 is achieved for fiber length >2.3m. The results show that trench helps significantly in controlling the DMG. Fig. (d) shows that over the C-band, more than 20 dB amplification of five mode groups with nearly 1 dB gain excursion is achieved with?neff> 5.1 × 10-4 and NF < 3.6 dB.Conclusion & Significance: The numerical simulations show that trench contributes significantly in minimizing the DMG. The proposed FMEDFA is capable to amplify 18 modes simultaneously with more than 20 dB gain and nearly 1 dB gain excursion. Therefore, proposed FMEDFA would be useful for FMF based SDM optical communication system.