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Underwater optical wireless has two distinct modes of communication depending on the choice of transmitter technology; short-ranged dispersive LED links (<20m) and longdistance, narrow laser links. In both cases, existing propagation models use a single-value estimation of attenuation but this is not accurate for the latter. Changes in attenuation are caused by variable composition where the natural...
The performance of duplex underwater optical wireless communication systems are limited by back-scattering of the transmitted light. This paper introduces a novel underwater wireless link design using hybrid optical/acoustic as a method to overcome it. The design comprises of highly directive, high-bandwidth optical uplinks from submersed AUVs or divers to a base station and a low bandwidth, wide-angle...
A single-die monolithically integrated multichannel silicon nanophotonics receiver is fabricated in IBM 90nm CMOS Nanophotonics technology node. Electrical eye diagrams for 16 channels exhibit open eyes up to 20Gbps with a 127mW/channel power efficiency.
The performance of Johnson and Thermal noises in the Line-Of-Sight (LOS) optical wireless channels has been monitored in a previously implemented application-specific genetic algorithm. The latter achieves sensible selection requirements of link parameters in different weather conditions and link characteristics, and the changes in thermal and Johnson noises are recorded correspondingly. The work...
A monolithically-integrated germanium receiver is fabricated in the IBM's newly established 90nm CMOS-integrated nanophotonics technology node. Technology is promising for cost-effective 10Gbps to 28Gbps optical communications links operating within extended temperature range up to 95°C.
A sub-100nm technology that allows the monolithic integration of optical devices as features into a 90nm base high-performance logic technology node is demonstrated. The technology is promising for next generation optical communications for applications.
This paper presents a genetic algorithm selection technique of appropriate transmission wavelengths in the line-of sight (LOS) optical wireless channel, under different weather conditions. The overall deterministic attenuations are usually presented in an international code of visibility model, and the changes in visibility decide about the wavelength control margin. However, the proposed work suggests...
Vehicular communications have become an attraction field to researchers in different sectors; from electronic systems, then communication technologies, automotive control systems, to network topology developers. Control, audio and video signals are circulated within a vehicle using wired and wireless networks. Optical Wireless (OW) technology has started to be used in intra-satellite links and aircraft,...
Future challenges to bandwidth scaling within computing systems are considered, including the current unsustainable increase in the number of fibers per system. Several approaches to increase the bandwidth per fiber in future systems are outlined.
Combining L-level pulse-position modulation (LPPM) and L-level pulse-width modulation (L-PWM), this paper describes a new hybrid modulation scheme, L-level Pulse-Position-Pulse-Width Modulation (PPMPWM), which has a relatively low bit error rate, and improved power and bandwidth efficiencies compared to PPM. The properties of the PPMPWM scheme are investigated thoroughly through simulation to show...
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