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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, 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 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. 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, 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. 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. https://owcc.jakajima.eu/previous-editions/ #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.<br />Keywords—Reed Solomon codes (RS codes), Self-synchronizing Reed Solomon codes (SSRS codes), Pulse Position Modulation, styling, Gamma-gamma channel, Free Space Optics (FSO)<br /><br />By Azka Choudhry, National University of Computer and Emerging Sciences (FAST NU) at the 3rd edition of the Optical Wireless Communication Conference.<br /><br />https://owcc.jakajima.eu/previous-editions/<br /><br />#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
By Marco Fernandes, PhD student, Instituto de Telecomunicações - Aveiro, Universidade de Aveiro at the 3rd edition of the Optical Wireless Communication Conference. https://owcc.jakajima.eu/previous-editions/ #owcc #jakajimatv
for Trending Cardiac Output and Stroke Volume in Cardiac Surgery Patients by Joris van Houte, CZE At the 2nd edition of the Point of Care Ultrasound Conference. For More information go to https://pocus.jakajima.eu/ #pocus #pointofcare #jakajimatv #healthcare #medtech #cardiacsurgery #ultrasound
The superior modulation bandwidth of laser diodes (LDs) makes them an ideal candidate for transmitters in optical wireless communication (OWC). One of the most important limitations in human-accessible environments is laser safety [1] which limits the transmission power and thereby coverage and range. The average LD power can be increased by means of optical components to reduce the power density or to increase the maximum permissible exposure (MPE). The power density is reduced by increasing the beam diameter and the emission angle 𝜃𝜃e to reduce the impinging optical power onto the human eye. The MPE is the limit value for the laser class defined by IEC 60825-1 [1]. Within certain limits, the MPE is influenced by the wavelength λ and the size of the apparent source. A large apparent source avoids sharp focus points on the retina. René Kirrbach, Fraunhofer IPMS at the 3rd edition of the Optical Wireless Communication Conference https://owcc.jakajima.eu/ #owcc #opticalillusion #wireless #jakajimatv #laser #safety #fraunhofer
by Thiago Elias, Researcher PHD Student, Eindhoven University of Technology The Internet is not only accessed by computers and smartphones. With the rise to the Internet-of-Things (IoT), a very wide variety of smart objects can be connected to the Internet. Today, there are already billions of wearables, sensors, televisions, medical and industrial machines, and other devices. Moreover, many new data-hungry applications have been or are being developed, such as Virtual Reality (VR), augmented reality (AR), high-definition video streaming and Industry 4.0. The rapidly progressing technology greatly increases the flow of data across our wireless networks. In future, much larger traffic flows are expected, so this puts pressure on the development of communication systems that must satisfy the requirements of the new technologies used massively by the many users or by autonomous devices. https://owcc.jakajima.eu/ #owcc #opticalcommunications #LED #wireless #jakajimatv
by Nikola Serafimovski, Co-Chair, Light Communication Alliance at the 3rd edition of the optical Wireless Communication Conference<br /><br />https://owcc.jakajima.eu/previous-editions/<br /><br /><br />#owcc #opticalcommunications #wireless #standardization #interoperability #lifi
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