- 标题
- 摘要
- 关键词
- 实验方案
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Integrated OAM and Transport SDN Architecture for Automatic and Dynamic Restoration of Signal-Degraded Connections within Flexi-Grid Optical Networks
摘要： The programmability of upcoming transport optical networks is handled by a centralized Transport SDN (T-SDN) controller. The T-SDN controller dynamically computes and selects the resources to automatically accommodate optical connection requests by configuring the involved network elements and devices (i.e., optical switches and transceivers). Additionally, the T-SDN controller should provide management functions to ensure high reliability and correct service status in terms of QoS, QoT, failure detection, etc. during the whole connection duration. These management functions are typically addressed by the operation, administration and maintenance (OAM) Handler. Thereby, the OAM Handler interacts with the monitoring system to gather notifications about connection failures or degradations and trigger the required actions to preserve / recover the services. This work first overviews the designed and implemented architecture integrating required OAM functions into a deployed T-SDN controller for flexi-grid optical networks. Next, two restoration routing approaches are presented, which are compared with respect to the blocked bandwidth ratio (BBR), restorability and average number of used sub-transceivers. The experimental performance is made varying both the traffic load and the generation of signal degraded events of existing connections, forcing their automatic restoration.
关键词： flexi-grid optical network,dynamic restoration,OAM,PCECC,T-SDN
更新于2025-09-10 09:29:36
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Design Considerations for an Energy-Aware SDN-Based Architecture in 5G EPON Nodes
摘要： In the evolution of telecommunication industry towards 5G, Ethernet Passive Optical Networks (EPON) technology, with some unique features such as high capacity, low latency, and minimum cost per bit, positions itself as an interesting option for backhauling solution in the Multi-access Edge Computing (MEC) scenarios. It is expected to see the converged optical-radio nodes play a crucial role in future networks. To maximize the benefits of the 5G EPON networks, besides all other challenges, it is essential to address two main issues, namely softwarization and energy efficiency. To this end, in this paper, initially we introduce a framework to have an open control layer based on SDN (Software-Defined Networks), able to prepare the EPON backhaul to deal with the 5G applications and services. Then we introduce a solution that minimizes the energy consumption of EPON networks without imposing additional packet delay.
关键词： Ethernet passive optical network (EPON),software defined networking (SDN),5G network,OpenFlow protocol,energy saving,passive optical network (PON)
更新于2025-09-09 09:28:46
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Resource allocation over EON-based infrastructures in a network virtualization environment
摘要： Through Network Virtualization, new networking paradigms can be easily implemented by sharing a common physical infrastructure between different users and applications. A fundamental aspect in this environment is how to efficiently map virtual resources onto physical resources, frequently referred as Virtual Network Embedding. Integer Linear Programming, heuristics and meta-heuristics have been commonly used to solve this problem. However, efficient allocation algorithms cannot ignore the main characteristics of the physical infrastructure. Simultaneously, Elastic Optical Networks (EONs), are gaining attention of researchers and industry due to their high spectrum efficiency, flexibility and adaptability that allow higher transmission rates able to cope with the tremendous IP traffic demand of new applications and services. In this paper, we formulate a mathematical model for the offline Virtual Optical Network Embedding assuming a transparent EON-based infrastructure. We then propose a meta-heuristic (PRVONE) based on an optical-path ranking system to provide scalable embeddings within reasonable running time. We evaluate our work through extensive simulations and compare it with state of the art approaches. Results show that PRVONE can achieve improvements in terms of acceptance ratio in all test case scenarios while providing load balanced embeddings.
关键词： Meta-heuristics,Virtual Optical Network Embedding,Elastic Optical Networks,Network Virtualization
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA, USA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - CHRONOS: A Cloud based Hybrid RF-Optical Network Over Synchronous Links
摘要： This paper presents CHRONOS, a Cloud based Hybrid RF-Optical Network Over Synchronous Links. The primary goal of this project is to design, build and maintain a multi-node, heterogeneous, wideband, scalable, hybrid and synchronous Cloud Radio Access Network (Cloud RAN or C-RAN), specifically to support emerging applications requiring both THz-optical and conventional sub-6GHz technologies like Wi-Fi and cellular networks. The novelty of the testbed is in enhancing the core capabilities of C-RAN in multiple directions by integrating synchronous RF and Optical links that is not considered for contemporary C-RAN deployments. The long term goal of this project is to utilize the testbed to enable practical research in wireless and optical communication with emphasis on new hardware and software architecture for signal processing. In this paper, we present the design, implementation and initial results of CHRONOS, in an indoor setting, with a clear path to a scalable and real-time network. Our results show synchronous reception across multiple edge nodes while achieving an aggregate bandwidth of 108Mbps using 20MHz OFDM waveform in each RF and optical paths.
关键词： CHRONOS,Cloud RAN,sub-6GHz,THz-optical,Synchronous Links,cellular networks,RF-Optical Network,Wi-Fi
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 20th International Conference on e-Health Networking, Applications and Services (Healthcom) - Ostrava, Czech Republic (2018.9.17-2018.9.20)] 2018 IEEE 20th International Conference on e-Health Networking, Applications and Services (Healthcom) - Design of hybrid EPON network with fiber-optic breath sensors
摘要： Optical fiber sensors are nowadays rapidly growing in the field of biomedical applications. It is possible to measure various variables, such as vital function, perform analysis of an analyte or observe bioluminescence. Specialized measurement using fiber optic sensors is the breath monitoring. For example, this system can be embedded into a bed for, or it can be a mobile device. Due to the passivity at the place of measurement and the use of non-magnetic materials in probe design, this solution is particularly interesting in applications where the environment is disturbed by the strong magnetic field such as in magnetic resonance imaging. The passivity of the sensor and operation over to long distance led to the idea of integration of sensors directly into the passive optical network. The design of coexistence of optic-fiber biosensors and PON is the primary aim of this publication. The proposed simulations and laboratory measurements point to problems that cause sensor integration into the network. As a result, methods for integrating sensors without compromising the communication part of the network are presented.
关键词： biosensors,optical fiber,sensors,passive optical network,breath monitoring,PON
更新于2025-09-09 09:28:46
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Priority-based mode transformation algorithm in a multisystem-based virtual passive optical network
摘要： With the development of passive optical network, different standards will occur in the same network topology. Virtualization technology is a preferable solution for multi-standard coexistence. In this paper, priority-based mode transformation algorithm is proposed for cross-standard bandwidth management in multisystem-based virtual passive optical network (VPON) in metro-access optical network (MAON). It is aimed to improve the fairness between priority services as well as the utilization of network resources. According to service lever agreement (SLA), priority services are divided into three categories: Expedited Forwarding (EF), Assured Forwarding (AF) and Best Effort (BE). For the ?rst time, a model transformation scenario that requires consideration of priority is analyzed. Under the model transformation scenario, multi-dimension 0/1 knapsack models of the priority-based mode transformation algorithm are established. By solving the model, an optimal combination of ONUs for mode transformation can be found. Finally, the simulation shows that the priority-based mode transformation algorithm and the single ONU mode transformation algorithm differ in the amount of each service’s transformation bandwidth. It further demonstrates the contribution of the proposed algorithm in fairness.
关键词： Mode transformation algorithm,DBA,Priority,Metro-access optical network,VPON
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Communication and Signal Processing (ICCSP) - Chennai, India (2018.4.3-2018.4.5)] 2018 International Conference on Communication and Signal Processing (ICCSP) - Optimization of Wavelengths, Grooming and Conversion Resources in All Optical WDM Networks
摘要： Wavelength division multiplexing (WDM) in all optical networks is a popular optical networking technology which involves routing and wavelength assignment (RWA) problem as a key aspect to be dealt with. The RWA problem is known to be NP- complete integer linear programming (ILP) problem. Most of the previous work in the field focuses RWA problem in optical networks with static connection requests and wavelength conversion. In this paper our study attempts to provide better utilization of wavelength and devices for wavelength conversion and grooming, thereby leading to minimization of number of wavelengths and cost of wavelength conversion and grooming. The proposed genetic algorithm (GA) heuristic with single objective and multi objective fitness functions provide better results for the RWA adopting first fit wavelength assignment and most used wavelength assignment methods. The simulation studies have been carried out over 14- node NSFNET network with the objective of minimizing blocking probability. We observe that multi objective heuristic adopting most used wavelength assignment outperforms the single objective heuristic.
关键词： Optical network,Wavelength division multiplexing,Wavelength converter,Lightpath,Routing and wavelength assignment
更新于2025-09-09 09:28:46
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Predictive Bandwidth Allocation Scheme with Traffic Pattern and Fluctuation Tracking for TDM-PON based Mobile Fronthaul
摘要： In future radio access systems, since the number of mobile base stations will increase to cope with the increasing mobile traffic, the number of mobile fronthaul (MFH) links will also have to increase. To reduce the MFH link cost, MFH networking has been attracting attention. In particular, the use of a time division multiplexed passive optical network (TDM-PON) makes the MFH link cost-effective. On the other hand, a TDM-PON has a huge latency when forwarding uplink traffic. In a typical dynamic bandwidth allocation (DBA) scheme, an optical network unit (ONU) has a very long transmission waiting time e.g. several milliseconds. This transmission waiting time in the ONU is a critical problem since the latency requirement for the MFH link is very strict e.g. less than 250 μs defined by the Third Generation Partnership Project (3GPP). In this paper, we propose a novel statistical DBA scheme taking high-speed traffic fluctuation to reduce the transmission waiting time. Our proposed scheme allocates bandwidth based on the only ratio of the data amount of each distributed unit (DU) and detects the pattern of the transmission interval of the burst signal. We show the feasibility with a numerical simulation and experiments.
关键词： 5G,Bandwidth allocation,Fronthaul,Passive optical network
更新于2025-09-09 09:28:46
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Time-aware Software Defined Networking for OpenFlow-based Datacenter Optical Networks
摘要： Data center networks are considered to make use of the computing and storage resources in data centers, which include intra-datacenter and inter-datacenter networks. Both of them will depend on the optical networking due to its advantages, such as low latency, high bandwidth, and low energy consumption. Data center interconnected by flexi-grid optical networks is a promising scenario to allocate spectral resources for applications in a dynamic, tunable and efficient control manner. Due to the high burstiness and high-bandwidth characteristics of the services, optical interconnect in intra-datacenter networks has attracted much attention compared with inter-datacenter network. Many datacenter applications in the environment require lower delay and higher availability with the end-to-end guaranteed quality of service. In this paper, we propose a novel time-aware software defined networking (TaSDN) architecture for OpenFlow-based datacenter optical networks, by introducing a time-aware service scheduling (TaSS) strategy. TaSDN can arrange and accommodate the applications with required QoS considering the time factor, and enhance the responsiveness to quickly provide for datacenter demand. The overall feasibility and efficiency of the proposed architecture are experimentally verified on our testbed with OpenFlow-based intra-datacenter and inter-datacenter optical networks.
关键词： time-aware,software defined network,OpenFlow,optical interconnect,data center network,flexi-grid optical network
更新于2025-09-04 15:30:14
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Machine Learning for 100Gb/s/λ Passive Optical Network
摘要： To respond the growing bandwidth demand by emerging applications such as fixed-mobile convergence for 5G and beyond 5G, 100Gb/s/λ access network becomes the next research focus of passive optical network (PON) roadmap. Intensity modulation and direct detection (IMDD) technology is still considered as a promising candidate for 100Gb/s/λ PON attributed to its low cost, low power consumption and small footprint. In this paper, we achieve 100Gb/s/λ IMDD PON by using 20G-class optical and electrical devices due to its commercial linear and nonlinear availability. To mitigate the system distortions, neural network (NN) based equalizer is used and the performance is compared with feedforward equalizer (FFE) and Volterra nonlinear equalizer (VNE). We introduce the rules to train and test the data when using NN-based equalizer to guarantee a fair comparison with FFE and VNE. Random data has to be used for training, but for test, both random data and psudo-random bit sequence (PRBS) are applicable. We found NN-based equalizer has the same performance with FFE and VNE in the case of linear distortion only, but outperforms them in strong nonlinearity case. In the experiment, to improve the loss budget, we increase the launch power to 18 dBm, achieving a 30-dB loss budget for 33Gbaud/s PAM8 signal at the system frequency response of 16.2 GHz, attributed to the strong nonlinear equalization capability of NN.
关键词： neural network (NN),machine learning,intensity modulation and direct detection (IMDD),digital signal processing (DSP),Passive optical network (PON)
更新于2025-09-04 15:30:14