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We proposed a fast all-optical regenerative memory loop which can be used for pulse amplitude modulation (PAM). The ultra-fast all-optical memory loop is based on the Mach-Zehnder interferometer (MZI) with quantum dot (QD) semiconductor optical amplifier (SOA) in each arm. It can operate at bit rates up to 100 Gb/s due to the fast gain recovery typical for QD-SOA. We have carried out the numerical...
The expected explosion of services offered in the cloud has revealed new paradigms in telecommunication networks and motivated research to satisfy the needs arising. Interconnection between facilities hosting computing resources or between computing resources and end-users may require service-specific Service Level Agreement (SLA) parameters. In this paper, we study the minimum connectivity requirements...
To date, most resource allocation proposals in elastic optical networks have focused either on routing and spectrum assignment (RSA, assuming fixed coding scheme and modulation format) or routing, modulation level and spectrum assignment (RMLSA, assuming a fixed coding scheme). Recent research has studied the impact of adaptive assignment of the code rate, without adapting the modulation format (RCSA...
Direct phase modulation of DFB is demonstrated with DPSK, DQPSK and Duobinary modulation formats and detected with an intradyne receiver based on a 120-degree hybrid. The system is tested in a 50 km fibre link with 6.25 GHz channel spacing among users in a UDWDM-PON. By using higher modulation formats, the spectral efficiency can be increased in a single carrier system without spectral shaping while...
ABNO's OAM Handler is extended with big data analytics capabilities to anticipate traffic changes in volume and direction. Predicted traffic is used to trigger virtual network topology re-optimization. When the virtual topology needs to be reconfigured, predicted and current traffic matrices are used to find the optimal topology. A heuristic algorithm to adapt current virtual topology to meet both...
Elastic optical networks have assumed so far that each optical signal is transmitted along a dedicated frequency slot, avoiding any frequency overlap with other optical signals.
Sliceable Bandwidth-variable Transponders (SBVTs) enhance the configurability and flexibility of Flexgrid optical networks. A single SBVT can be used to transmit and receive several optical signals each modulated with a specific format. A SBVT can be seen as a set of sub-transponders that can be specifically configured to end a specific lightpath, by defining, among other parameters, the modulation...
The evolution of novel access networks is dominated by two major changes: first, an increasing convergence of fixed optical and mobile wireless access networks (driven by the industry interested in mutualizing infrastructure); and secondly, a surge in video traffic (expected to represent 80 percent of all consumer Internet traffic in 2019). This motivates the introduction of video delivery optimization...
Spatial Division Multiplexing (SDM) arises as the only solution to overcome the capacity limits of single-mode optical fibres (SMFs). Among the different SDM flavours, Multi-Core Fibres (MCFs) are gaining interest thanks to their low inter-core crosstalk (XT). In this context, Flex-Grid is envisioned as the technology that enables the efficient allocation of connections in SDM-based optical networks...
Fibre to the Home (FTTH) is currently the best solution to meet the requirements of the Digital Europe Agenda within the Europe 2020 strategy, concerning with the increase of the high speed access usage among the European citizens. Nevertheless, the roll-out of FTTH has high costs for the deployment of the optical fibres and the equipment that limit the investments from the operators. Therefore, the...
In this paper, a new scheme is proposed to obtain the strategic locations of the cooperative transceivers on free space optical node in last-mile network. The scheme is formulated as bi-level multiple-objective linear integer programming (BL-MO-ILP) problem, and solved by exhaustive search method to obtain the optimal solutions. The scheme leads to an increasing in the immunity of network against...
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