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The fronthaul between the Central Office, hosting the BBU pool, and the different located RRUs in a C-RAN has been based mainly on dedicated fibre links or, more recently, on dedicated lightpaths over a fibre network. A more cost effective solution is to deploy the C-RAN fronthaul based on Ethernet technologies but such solutions must be carefully investigated due to the very demanding latency and...
In contrast to the more prominent discrete-variable quantum key distribution (DV-QKD), which requires specialized hardware like single-photon detectors, the continuous-variable version (CV-QKD) promises low-cost and high-performance implementations by leveraging mature telecommunication technology. In this paper we demonstrate a simplified CV-QKD architecture based on analog frontends and digitizers...
In this paper, we propose, design, and evaluate the use of transmitters mapping with a symbols encoding techniques to mitigate inter-symbol interference (ISI) and improve the overall VLC system performance while using a very simple receiver (single element wide field of view, (FOV)) with an OOK modulation scheme. The proposed technique with the laser diodes transmitters are able to provide data rates...
In this paper, we thoroughly investigate how evolutions of accumulated differential group delay (DGD) along the fiber link depend on the fiber polarization mode dispersion coefficient (PMDc). We show that PMD statistics is important for simulating nonlinearity-PMD interactions and results depend on the way the PMD statistics is chosen. The results are demonstrated for the PMD-affected conventional...
In this paper, Hybrid PSK-MPPM is proposed to improve the system performance of the conventional ACO-OFDM by modulating the subcarriers with less number of high power PSK modulated symbols while their positions will also be utilized to carry additional information. At the receiver, the position of the modulated subcarriers will be firstly identified on each sub-frame by selecting the subcarriers with...
In this paper, we present an efficient synchronous transmission access protocol suitable for WDM networks of passive star topology. A single control channel is assumed in order to properly coordinate the data packets communication. According to the proposed WDMA scheme, a data channel is assigned at each station that attempts data packet transmission, avoiding the collisions over the data multi-channel...
Photonic-electronic integration is a key technology to master data traffic growth and therefore an enabler of future network technologies. For some time now, a novel silicon-based photonic-electronic integration technology, photonic BiCMOS, is under development at IHP. Photonic BiCMOS is a planar technology co-integrating monolithically on a single substrate high-speed RF frontend electronics - by...
We present a robust adaptive digital pre-distortion technique to mitigate the linear and non-linear degradation of optical communication transmitter components. The proposed method is based on the principles of memory polynomial based pre-distortion and indirect learning architecture. Effectiveness of the presented algorithm is assessed across various higher order modulation formats and higher baud...
The performance of free-space optical (FSO) transmission systems adopting multi-pulse pulse-position modulation (MPPM) scheme is investigated taking into account the effects of the atmospheric turbulence, fog, and beam divergence. The atmospheric turbulence is modeled by the exponentiated Weibull (EW) distribution. A closed-form expression for the symbol-error rate ( SER) of our MPPM-FSO system is...
In this paper, an overview of main results concerning THz detection by nanometer field effect transistors (FETs) and heterojunction based transistors (HBTs) is presented. Different GaInAs/InP and GaN/AlGaN nanometer field effect transistors based detectors are presented. We present also first Silicon C-MOS transistors based integrated circuits for wireless communication in sub-THz range. Special attention...
The increasing demand for bandwidth in datacenter interconnect links is currently driving a transition towards four level pulse-amplitude modulation (PAM-4) as the de facto modulation format. Nevertheless, other schemes with even higher spectral efficiency will be required in the future given the challenges of increasing baud rate or number of channels. As enabling technology, we propose and demonstrate...
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