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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...
We have experimentally investigated the RF linewidth and timing jitter in self-mode-locked two-section quantum dash lasers emitting at ∼1.55 µm and operating at ∼21 GHz repetition rate, subjected to single and dual loop optical feedback into the gain section, over a wide range of feedback delay. Various feedback conditions are investigated and optimum levels determined for narrowest linewidth and...
Aiming at satisfying in a cost-effective manner the forecast traffic growth that future mobile networks will need to support, traditional distributed Radio Access Networks (RANs) are evolving towards centralized architectures. Specifically, the Cloud-RAN (C-RAN) architecture has shown that can alleviate to some extent the ever increasing Total Cost of Ownership in mobile networks. The current trend...
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...
We demonstrate a symmetric dual loop feedback scheme, insensitive to delay phase tuning, for a self-mode-locked quantum dash laser emitting at ∼ 1.55 µm and operating at ∼ 21 GHz repetition rate. These lasers are subjected to single and dual loop optical feedback into the gain section. Various feedback conditions are studied and optimum levels determined for narrowest linewidth and reduced timing...
Passively mode-locked (PML) semiconductor lasers are compact photonic sources delivering a train of picosecond short optical pulses for optical clock distribution, high bit-rate optical time division multiplexing and compact microwave/millimeter-wave signal generation. The pulse train can exhibit considerable timing jitter (TJ). We extend the recently studied impact of dual long-cavity optical feedback...
Compact monolithic passively mode-locked semiconductor lasers offer repetition frequencies in the Multi-GHz range and the generation of picosecond-short optical pulses. Their pulse train timing stability however, is considerable lower as compared to fiber-based pulsed lasers. All-optical self-feedback configurations have been studied that allow to substantially improve the timing stability. We present...
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, 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...
The optical packet switching technology has been identified as a key technology to offer data rate and modulation format transparency, fine switching granularity and efficient bandwidth utilization. The ANR N-GREEN project proposes a novel over-dimensioned switch/router node with colored optical packet concept. In this work, we propose a new WDM slot sharing approach that significantly improves N-GREEN...
The optical network of the future will have ~3 orders of magnitude increase in data rates, mostly due to large transactions. These elephant flows need fast scheduling of network resources and agile network adaptations for congestion control, load balancing and reconfiguration to cope with huge traffic transients and reconstitution for network resilience. This paper move beyond SDN as well as “orchestration,”...
Standardization bodies such as IEEE and 3GPP, as well as other interest groups, are in the process of defining and standardizing different functional subdivisions within mobile network base stations, primarily to reduce the data rate requirements imposed on the transport architecture by 4th and 5th generation mobile systems. Ethernet is considered the leading candidate for the transport architecture...
In flexible functional split, functions of a virtualized evolved NodeB (eNB) can be disaggregated in distributed computational resources. One of the main constraints for their placement is the latency experienced by the communication between the Virtual Machines (VM) hosting the functions. This paper evaluates experimentally the latency limits for different functional splits providing insights on...
In this paper we introduce the SDNRoute system which aims to support routing decisions in Software Defined Networks. Such a system is especially important in the context of the SDN as this concept makes it possible to perform routing in a dynamic and elastic manner. We focus on the SDNRoute architecture and research challenges that must be investigated to develop the system. Additionally, we provide...
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