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The wavelength division multiplexing (WDM) type optical communication significantly increases the transmission capacity. However, one of the key issues is how we can reduce the pulse broadening and the interaction between the neighboring channels due to the nonlinear effects. The optical soliton offers the answer to this question. The soliton pulse can keep its shape during propagation, when there...
PROnet is a two-layer Research and Education Network (REN) deployed at and around the UT Dallas campus. PROnet makes use of a Software Defined Networking (SDN) orchestrator, described in this paper. The PROnet Orchestrator provides two critical functions in an Ethernet-over-Wavelength Division Multiplexing (WDM) network. The two functions are: 1) on-demand flow provisioning at the Ethernet layer and...
The usual strategy of augmenting capacity between consecutive generations of DWDM networks by increasing the bit rate per channel is starting to be challenged as theoretical capacity limits are approached. Hence, capacity augmentation alternatives such as using more wavelength bands, exploiting multi-mode fibre transmission and deploying additional fibre pairs or multi-core fibres are being investigated...
In this work we analyse radio access networks (RAN) deployments from the capacity and cost points of view. We find that in order to support the new radio (NR) with system bandwidth of 800MHz and reduce the number of fibre connections between NR and baseband units (BBU) one can use dense wavelength division multiplexing (DWDM), pulse amplitude modulation (PAM4) or multicore fibre. We also find that...
Ultrahigh-speed (>50 Gb/s) short-reach fiber-optic links can be implemented cost-effectively by using directly modulated lasers (DMLs). For demonstrations, we successfully transmit 56-Gb/s PAM-4 signal over 20 km of SSMF by using 1.5-µm DML and 117-Gb/s DMT signal over 30 km of SSMF by using 1.3-µm DML.
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...
WDM has been generally proposed to groom wavelengths for transport applications. This paper will describe our attempt to reduce cost and energy consumption of smart network elements, through an extended use of WDM techniques at the data link level. This paper will draw the advantages of this approach and will demonstrate that this new direction is efficient to keep the frequency processing at a reasonable...
With deployment and continuous development of optical routes, the issues concerning the thermal loading of erbium-doped optical fibres become more and more relevant. As we were able to see a significant expansion of optical communication systems in the recent years, it was also necessary to find ways for bridging longer distances between individual points of the optical route. Modern optical telecommunication...
The dramatic increase in demand for services that require high bandwidth and augmented bitrate to function properly has become a trend in recent years. In order to comply with the current demand, telecom companies struggle to enlarge the offered capacity as well as to minimize the latency and to enhance the reliability of the network. An effective technique to increase the capacity is to move to higher...
Achieving high data rate is one of the primary goals of visible light communication (VLC) systems. This paper introduces a VLC system based wavelength division multiplexing (WDM) to achieve a high data rate. In this work, red, yellow, green and blue (RYGB) laser diodes (LDs) are used as transmitters to obtain high modulation bandwidth and an imaging diversity receiver (IMDR) is used as an optical...
We have introduced a novel metro network architecture called Ultra-Dense Wavelength Switched Network (UD-WSN) [1], which enables an even fine spectrum granularity so as to efficiently accommodate low-speed metro services (e.g., 1GE/10GE services). We evaluate the performance of this type of networks with spectrum defragmentation and partial optical transport network (OTN) switching. An efficient spectrum...
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...
COCONUT project demonstrated an innovative DWDM Passive Optical Network implementing the full λ-to-the-user concept in a filterless distribution fiber network. We make use of an innovative class of coherent transceivers that exploit the advantages of coherent detection in terms of sensitivity and channel selectivity in a cost efficient manner. The different transceivers developed target different...
The EU FP7 ERMES project focused on the development of a wavelength division multiplexed passive optical network (WDM PON) colourless self-tuning transmitter based on reflective semiconductor optical amplifiers (RSOAs) self-seeding. These transmitters represent low cost solutions to achieve self-organized wavelength access networks. The EU ERMES project developed self-tuning transmitters both in the...
Optical access promises high data throughput for the wired and wireless segment. Especially the use of wavelength division multiplexing (WDM) enables the aggregation of massive capacities. The continuously increasing density of communication terminals per network demands ultra-dense WDM architectures, while sub-systems for the insertion and extraction of channels are to be performed cost-effectively...
The Internet data traffic constant growth caused by the popularization of cloud services, mobile and social networks is requiring changes at the underlying networks in order to enable scalability whereas supporting a highly dynamic connectivity. Cost-effective and energy efficient solutions for flexible network subsystems are also required in order to provide future sustainable networks. In this paper,...
In the context of long-haul Nyquist wavelength division multiplexed (WDM) superchannel system, a fifth-order Volterra-based nonlinear equalizer (VNLE) is proposed to compensate for the optical fiber nonlinear effects, which represent the major fiber impairment in such high data rate systems. A performance comparison of the fifth-order VNLE with the benchmark digital-back propagation (DBP) and the...
Scaling the capacity while maintaining low latency and power consumption is a challenge for hierarchical data center networks (DCNs) based on electrical switches. In this work we present a novel optical DCN architecture called OPSquare that potentially addresses the scaling issues by employing parallel intra- and inter-cluster switching networks based on distributed fast WDM optical cross-connect...
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