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by Benjamin Azoulay, President and CEO, OLEDCOMM during the LiFi Conference Space applications are highly growing and total mass of shielded cables inside space engines a real pain point : costly and certain design contraints. LiFi is an enabler for cable replacement applications and we will explain the main use cases and experience of Oledcomm in this domain. Read more on https://lifi.jakajima.eu/speaker/2023/06/12/lifi-for-space-applications/ #CABLES #DESIGN #LIFI #OLEDCOMM #PARISSACLAY #REPLACEMENT #ROCKET #SATELLITE #SHIELDED #SPACE #UNIVERSITY #owcc #phapps #jakajimatv
Optical Wireless Communication Conference: a new edition is coming up and it will be held in Eindhoven in December 14/15 2023. The main theme will be 6G. What intrigues us is what the role of photonics will be. Jürgen Van Erps is member of the TPC, so Jean-Paul Linnartz asked him about his view: in #LiFI system, there are many aspects to take into account, not only pushing as many bits per second as possible through the link. There are also aspects such as how to steer beams, how to shape beams. There are different approaches to miniaturize the entire system onto a #photonic integrated circuit. Many recent developments are trying to put as many optical functionalities as possible on the chip, but we often see that when you interface the chip with the outside world, that additional micro optical components can provide added value to further increase the efficiency and the functionality of the interface with the outside world. For more information go to https://www.owcconference.com #owcc #phapps #photonics #jakajima #Wirelesscommunication #jakajimatv #conference #papersubmission #research #innovation #pics #photonicintegration
by Harald Haas, Distinguished Professor, University of Strathclyde during the 2023 LiFi Conference We will review the current trends in 6G. In this context will showcase the opportunities for optical wireless communications in general and LiFi in particular. We will provide examples of ongoing activities as part of the new 6G research platform in the UK: PlaTform DrIving The UltimAte CoNnectivity (TITAN) on the future network of networks (NoN). TITAN is a consortium of 16 universities in the UK. Read more on https://lifi.jakajima.eu/speaker/2023/06/03/the-role-of-lifi-in-6g/ #6G #COMMUNICATION #IEEE #LIFI #OPTICAL #RESEARCH #STRATHCLYDE #UNIVERSITY #WIRELESS #Phapps #jakajimatv
by Nikola Serafimovski, Co Chairman, Light Communications Alliance / VP. Standardization and Business Development, Purelifi LiFi now has 2 market relevant standards including the IEEE 802.11bb and ITU-T G.9991. This talk will present the status of each and implementation options. The talk will also look at the remaining options for the standardization of LiFi and the next steps. Anyone interested in building LiFi standardized products should attend. Read more on https://lifi.jakajima.eu/speaker/2023/06/13/on-standardisation-of-lifi-and-beyond/ #ALLIANCE #COMMUNICATION #IEEE #ITU #LCA #LIGHT #PURELIFI #STANDARD #STANDARDIZATION #lifi #phapps #jakajimatv
by Professor Jean Paul Linnartz, Eindhoven University of Technology / Signify 6G and Optical Wireless Communication! This edition of the Optical Wireless Communication Conference focusses on the role optical wireless communication can play to address some of the key challenges of 6G. 6G will have to serve many mobile users and IoT devices at a density of terabits per second per square meter. Current RF systems provide continuously improving performance but at rapidly increasing cost, complexity and power consumption. Yet, very high bit rates in large amounts of available spectrum can be realized by steerable or switched light beams, which also allow dense reuse. As cell sizes have been shrinking exponentially in the past decades to serve an ever-increasing amount of client devices, atto-cells covered by an optical beam coming from the ceiling are a natural next step. The compact disc (CD) and digital versatile disc (DVD) technology have already proven many years ago that high-capacity steerable lasers can become a mass market product. https://www.owcconference.com
Miniaturization is one of the big trends that we can identify across many scientific and technological research domains. This is also the case in the world of optics and photonics, where a reduction of the footprint and cost of components is often desired. One particular application area is that of optical interconnections. Single-mode optical fibers are widely used in optical communication and sensor systems for their small size,<br />immunity to electromagnetic interference, low signal loss and high capacity. At the input and output of such fibers, different types of optical components can be used to guide the light into the right direction as efficiently as possible. Examples of such components that have been developed are gratings (to split different wavelengths into different directions, used in wavelength division multiplexing systems), couplers (to couple or<br />split the light to other fibers and components), lensed components (to focus or collimate the light beam for better free-space propagation and coupling performance), tapered components (to expand or decrease the beam size) and many more. <br /><br />Mostly, these components are made from several discrete optical elements put together to obtain the desired functionality. In recent years however, a 3D direct laser writing fabrication technology based on two-photon polymerization (2PP) is gaining interest due to the combination of full 3D design freedom and sub-micrometer resolution [1]. In this work,<br />we present the design, direct laser fabrication, and proof-of-concept demonstration of various optical elements such as mode conversion tapers, micro-lenses, and diffractive elements directly integrated on the fiber tip, resulting in extremely compact components with high optical performance for short-range optical interconnections.<br /><br />By Koen VanMol, Post-doctoral researcher, Brussels Photonics (B-PHOT), Vrije Universiteit Brussel and Flanders Make at the 3rd edition of the Optical Wireless Communication Conference.<br /><br />https://owcc.jakajima.eu/previous-editions/<br /><br />#owcc #jakajimatv
RS encoded PPM proves to be the best suited encoding scheme in terms of its efficiency and robust nature for terrestrial FSO links. Self-synchronizing RS codes are superior to RS codes in terms of their synchronizing ability but they have not been put to proper experimental use. In this paper, we have tried to conduct a comparative study between RS (n, k) and self-synchronizing RS (n, k) when used with M-ary PPM. We considered the use of RS (255,223) and self-synchronizing RS (255,223) along with 16-PPM through a gamma-gamma channel. The bit error rate for both models was plotted against the signal to noise ratio. The results indicated their similar behavior with no visible difference in their performances except at higher noise variation values. It can be concluded that increase in the value of noise variation along with the use of higher states of PPM can lead to better performance of self-synchronizing codes. Keywords—Reed Solomon codes (RS codes), Self-synchronizing Reed Solomon codes (SSRS codes), Pulse Position Modulation, styling, Gamma-gamma channel, Free Space Optics (FSO) By Azka Choudhry, National University of Computer and Emerging Sciences (FAST NU) at the 3rd edition of the Optical Wireless Communication Conference. https://owcc.jakajima.eu/previous-editions/ #owcc #jakajimatv
An invited speaker presentation by Professor Andrea Melloni, the Photonic Devices Group in the Dipartimento di Elettronica, Informazione e Bioingegneria at the Politecnico di Milano during the Optical Wireless Communication Conference. In a Free Space Optics (FSO) link, there are several phenomena that can affect and degrade the performance of the channel. Among them, atmospheric turbulence plays a relevant role and today is the main obstacle in the implementation of high bitrates reliable FSO communication systems. The effect of turbulence on optical beams can be described as a random phase and amplitude modulation which results in a beam profile affected by scintillation. This random modulation reduces the coupling efficiency with the receiver and causes deep fading in the signal after the photodetector. These effects can be mitigated using a multi-aperture receiver; the distorted wavefront is sampled in several points where each portion of the optical signal has its own amplitude and phase. By increasing the number of apertures, the fading probability reduces. The sampled optical signals originating from each aperture have random and uncorrelated amplitude and phase and they must be recombined coherently, but their phase randomly change in time because of turbulence, with a bandwidth several hundreds of Hz. In this work, the incoming optical beam is sampled by an integrated optical phased array antenna with 16 elements and each sample is coherently combined by means of a Programmable Optical Processor (POP). The dynamic adaptive control layer can compensate the fluctuations of the incoming phase front and stabilize the link at 10 Gbit/s. The experiments are conducted indoor emulating the atmospheric turbulence with realistic intensities. The results demonstrate the effectiveness of the approach in terms of performance and footprint compared with other solutions. https://owcc.jakajima.eu/blog/2022/10/19/self-adaptive-programmable-optical-processor-for-fso-turbulence-mitigation/ #FSO #owcc #jakajimatv #freespaceoptics
Laser-based and LED-based optical wireless communication has attracted a lot of attention in recent years due to advantages over radio RF-based systems. By using light, systems have advantages over RF systems such as immunity to RF interference, high security, lower cost and lower power consumption. LEDs have the advantage that illumination systems can be reused, and that modulation some extra power is needed but a DC bias is already available [1]. LEDs have limitations as their bandwidth is limited. Lasers have wider modulation bandwidths thus provide higher throughput. But in such case, a bottleneck of the system may shift to the receiver side. by Lev Azarkh, Eindhoven University of Technology at the 3rd edition of the Optical Wireless Communication Conference. https://owcc.jakajima.eu/previous-editions/ #owcc #jakajimatv #LED #detector #optical #wireless #communication
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