With the development of 5G and mobile edge computing, deep neural network (DNN) inference can be distributed at the edge to reduce communication overhead and inference time, namely, DNN distributed inference. DNN distributed inference will pose challenges to the resource allocation problem in metro optical networks (MONs). Efficient cooperative allocation of optical communication and computational resources can facilitate high-bandwidth and low-latency applications. However, it also introduces greater complexity to the resource allocation problem. In this study, we propose a joint resource allocation method using high-performance transfer deep reinforcement learning (T-DRL) to maximize network throughput. When the topologies or characteristics of MONs change, T-DRL requires only a small amount of transfer training to re-converge. Considering that the generalizability of conventional methods is inversely related to optimization performance, we develop two deployment schemes (i.e., single-agent and multi-agent) based on the T-DRL method to explore the performance of T-DRL. Simulation results demonstrate that T-DRL greatly reduces the blocking probability and average inference time of DNN inference requests. Besides, the multi-agent scheme can maintain a lower blocking probability of requests in MONs, while the single-agent has a shorter convergence time after network changes.
{"title":"DNN distributed inference offloading scheme based on transfer reinforcement learning in metro optical networks","authors":"Shan Yin;Lihao Liu;Mengru Cai;Yutong Chai;Yurong Jiao;Zheng Duan;Yian Li;Shanguo Huang","doi":"10.1364/JOCN.533206","DOIUrl":"10.1364/JOCN.533206","url":null,"abstract":"With the development of 5G and mobile edge computing, deep neural network (DNN) inference can be distributed at the edge to reduce communication overhead and inference time, namely, DNN distributed inference. DNN distributed inference will pose challenges to the resource allocation problem in metro optical networks (MONs). Efficient cooperative allocation of optical communication and computational resources can facilitate high-bandwidth and low-latency applications. However, it also introduces greater complexity to the resource allocation problem. In this study, we propose a joint resource allocation method using high-performance transfer deep reinforcement learning (T-DRL) to maximize network throughput. When the topologies or characteristics of MONs change, T-DRL requires only a small amount of transfer training to re-converge. Considering that the generalizability of conventional methods is inversely related to optimization performance, we develop two deployment schemes (i.e., single-agent and multi-agent) based on the T-DRL method to explore the performance of T-DRL. Simulation results demonstrate that T-DRL greatly reduces the blocking probability and average inference time of DNN inference requests. Besides, the multi-agent scheme can maintain a lower blocking probability of requests in MONs, while the single-agent has a shorter convergence time after network changes.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 9","pages":"852-867"},"PeriodicalIF":4.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141668118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jianmin Wang;Bin Li;Haochun Gao;Yang Lin;Zhiqian Su
The acquisition time of tens to hundreds of seconds in the optical link between satellites makes it difficult to meet the needs of constructing spatial optical networks. In addition, as a basic requirement for deep space explorers, autonomous attitude determination and autonomous navigation demand the installation of separate, expensive, and complex inertial devices, and the communication data rate is too low to meet the timely transmission of large amounts of data. In this paper, we proposed and developed a multifunctional fusion space optical communication system for space optical networks and deep space exploration, which has the functions of autonomous attitude determination, autonomous navigation, and high-speed optical communication. The sub-second acquisition time can meet the requirements of space optical network construction, and the ability of autonomous attitude determination and autonomous navigation significantly reduce the amount of R&D expenses of the explorer; decrease the volume, weight, and power consumption of the explorer; and improve the reliability and autonomous survival ability of the explorer. The paper provides the structure, working principle, and main algorithm models and conducts a feasibility analysis and field experiments. The experimental results showed that the average open-loop pointing accuracy of the optical terminal is 95.8 µrad (attitude determination accuracy), which can be improved to 39.1 µrad after filtering, and the acquisition time is less than 1 s. For deep space exploration, the navigation accuracy is less than 67.6 km in the cruise phase and 10 km in the acquisition phase, and field experiments have also proven its feasibility. The significance of our research work lies in proposing what we believe to be a new system operation scheme and design method for optical communication systems, and its results can be widely applied in all fields of space optical communication.
{"title":"Space optical communication system for space optical networks and deep space exploration","authors":"Jianmin Wang;Bin Li;Haochun Gao;Yang Lin;Zhiqian Su","doi":"10.1364/JOCN.520301","DOIUrl":"10.1364/JOCN.520301","url":null,"abstract":"The acquisition time of tens to hundreds of seconds in the optical link between satellites makes it difficult to meet the needs of constructing spatial optical networks. In addition, as a basic requirement for deep space explorers, autonomous attitude determination and autonomous navigation demand the installation of separate, expensive, and complex inertial devices, and the communication data rate is too low to meet the timely transmission of large amounts of data. In this paper, we proposed and developed a multifunctional fusion space optical communication system for space optical networks and deep space exploration, which has the functions of autonomous attitude determination, autonomous navigation, and high-speed optical communication. The sub-second acquisition time can meet the requirements of space optical network construction, and the ability of autonomous attitude determination and autonomous navigation significantly reduce the amount of R&D expenses of the explorer; decrease the volume, weight, and power consumption of the explorer; and improve the reliability and autonomous survival ability of the explorer. The paper provides the structure, working principle, and main algorithm models and conducts a feasibility analysis and field experiments. The experimental results showed that the average open-loop pointing accuracy of the optical terminal is 95.8 µrad (attitude determination accuracy), which can be improved to 39.1 µrad after filtering, and the acquisition time is less than 1 s. For deep space exploration, the navigation accuracy is less than 67.6 km in the cruise phase and 10 km in the acquisition phase, and field experiments have also proven its feasibility. The significance of our research work lies in proposing what we believe to be a new system operation scheme and design method for optical communication systems, and its results can be widely applied in all fields of space optical communication.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 9","pages":"843-851"},"PeriodicalIF":4.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141673905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Beyond 5G, the next-generation wireless communication standard requires an optical communication network with a more reliable point-to-multipoint system. A highly reliable, futuristic point-to-multipoint coherent optical system must update wavelength-division-multiplexing-based passive optical networks to a more disaster-resistant architecture that can switch between bypass and backup links. We propose, to our knowledge, a novel link-pair shared protection that can respond locally to double-link failures that result from a significant disaster. We validate the high availability of several network configurations, assuming a double-link disconnection, can be obtained irrespective of the transmission distance of the feeder fiber. We experimentally demonstrate link-pair shared protection with bidirectional wavelength pre-assignment for two of the four feeder fiber failures and validate a penalty of less than 2 dB for double-link failures. Furthermore, we prove that reconnection can be performed with a penalty of at most 2 dB in an experiment with shared protection with a single-link broadcast-and-select function that can manage partial double-link failures using a simple configuration.
在 5G 之后，下一代无线通信标准要求光通信网络具备更可靠的点对多点系统。高可靠性的未来型点对多点相干光系统必须将基于波分复用技术的无源光网络更新为能在旁路和备份链路之间切换的抗灾能力更强的架构。据我们所知，我们提出了一种新型链路对共享保护方式，可在本地响应重大灾难导致的双链路故障。我们验证了几种网络配置的高可用性，假设双链路断开，无论馈线光纤的传输距离有多远，都能获得高可用性。我们在实验中演示了链路对共享保护与双向波长预分配，可应对四种馈线光纤故障中的两种故障，并验证了双链路故障的惩罚小于 2 dB。此外，我们还证明，在具有单链路广播和选择功能的共享保护实验中，使用简单的配置就能管理部分双链路故障，并能以最多 2 dB 的惩罚进行重新连接。
{"title":"Double-link-failure-tolerant shared protection for fully coupled/half-split switchable point-to-multipoint coherent optical systems","authors":"Takahiro Kodama;Tomoya Nakagawa;Shota Eguchi;Keiji Shimada;Ryosuke Matsumoto","doi":"10.1364/JOCN.511029","DOIUrl":"10.1364/JOCN.511029","url":null,"abstract":"Beyond 5G, the next-generation wireless communication standard requires an optical communication network with a more reliable point-to-multipoint system. A highly reliable, futuristic point-to-multipoint coherent optical system must update wavelength-division-multiplexing-based passive optical networks to a more disaster-resistant architecture that can switch between bypass and backup links. We propose, to our knowledge, a novel link-pair shared protection that can respond locally to double-link failures that result from a significant disaster. We validate the high availability of several network configurations, assuming a double-link disconnection, can be obtained irrespective of the transmission distance of the feeder fiber. We experimentally demonstrate link-pair shared protection with bidirectional wavelength pre-assignment for two of the four feeder fiber failures and validate a penalty of less than 2 dB for double-link failures. Furthermore, we prove that reconnection can be performed with a penalty of at most 2 dB in an experiment with shared protection with a single-link broadcast-and-select function that can manage partial double-link failures using a simple configuration.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 9","pages":"832-842"},"PeriodicalIF":4.0,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141686877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carmen Vazquez;Ruben Altuna;Juan Dayron Lopez-Cardona
This paper introduces the concept of power over fiber (PoF) and potential applications envisioned in radio access networks with optical fronthauling using different types of optical fibers. It is an open discussion on exploring PoF technology with current experiments integrating analog radio over fiber using 5G-NR signals in compliance with 3GPP, PoF, and monitoring techniques and general requirements in future deployments along with its potential to be part of the energy efficiency strategy in beyond 5G networks.
{"title":"Power over fiber in radio access networks: 5G and beyond","authors":"Carmen Vazquez;Ruben Altuna;Juan Dayron Lopez-Cardona","doi":"10.1364/JOCN.522900","DOIUrl":"10.1364/JOCN.522900","url":null,"abstract":"This paper introduces the concept of power over fiber (PoF) and potential applications envisioned in radio access networks with optical fronthauling using different types of optical fibers. It is an open discussion on exploring PoF technology with current experiments integrating analog radio over fiber using 5G-NR signals in compliance with 3GPP, PoF, and monitoring techniques and general requirements in future deployments along with its potential to be part of the energy efficiency strategy in beyond 5G networks.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"D119-D128"},"PeriodicalIF":4.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141666740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Linsheng Fan;Yanfu Yang;Qun Zhang;Siyu Gong;Yuchen Jia;Chen Cheng;Yong Yao
Optical performance monitoring is vital for enabling dynamically reconfigurable optical networks. This paper introduces a monitoring scheme that is robust to transceiver impairments for coherent digital subcarrier multiplexing (DSCM) systems that simultaneously monitors polarization-dependent loss (PDL), differential group delay (DGD), and chromatic dispersion (CD). In the proposed scheme, a pair of frequency domain pilot tones (FPTs) are inserted into the ${X}$ and ${Y}$ polarizations of the transmitted dual-polarization signal. Both the signal and the FPTs endure identical channel impairments during fiber transmission. At the receiver side, the transmitted FPTs are extracted to monitor the channel impairments. We begin by establishing a simplified system model using a single frequency tone to analyze the effects of system impairments on the frequency domain pilots. Based on this model, CD, PDL, and DGD are jointly and accurately estimated. In addition, the influences of temporal, amplitude, and phase mismatches between in-phase (I) and quadrature (Q) components of transceivers on channel impairment monitoring are completely eliminated. This achieves a channel impairment monitoring scheme that is robust to transceiver impairments. Experimental verification shows that the proposed scheme can jointly and accurately estimate a wide range of CD, PDL, and DGD. Additionally, the proposed monitoring scheme demonstrates strong robustness against transceiver impairments, rapid polarization fluctuations, and amplified spontaneous emission (ASE) noise.
光性能监测对于实现动态可重构光网络至关重要。本文介绍了一种对相干数字子载波多路复用（DSCM）系统的收发器损伤具有鲁棒性的监测方案，可同时监测偏振相关损耗（PDL）、差分群延迟（DGD）和色度色散（CD）。在提议的方案中，一对频域先导音（FPT）被插入到传输的双极化信号的 X 极化和 Y 极化中。在光纤传输过程中，信号和 FPT 都会受到相同的信道损伤。在接收端，通过提取传输的 FPT 来监测信道损伤。我们首先使用单个频率音建立一个简化的系统模型，以分析系统损伤对频域飞行员的影响。在此模型的基础上，CD、PDL 和 DGD 被联合准确地估算出来。此外，还完全消除了收发器同相（I）和正交（Q）分量之间的时间、振幅和相位不匹配对信道损伤监测的影响。这就实现了对收发器损伤具有鲁棒性的信道损伤监测方案。实验验证表明，所提出的方案可以联合并准确地估计各种 CD、PDL 和 DGD。此外，所提出的监测方案对收发器损伤、快速极化波动和放大自发辐射（ASE）噪声具有很强的鲁棒性。
{"title":"Transceiver impairment robust and joint monitoring of PDL, DGD, and CD using frequency domain pilot tones for digital subcarrier multiplexing systems","authors":"Linsheng Fan;Yanfu Yang;Qun Zhang;Siyu Gong;Yuchen Jia;Chen Cheng;Yong Yao","doi":"10.1364/JOCN.525128","DOIUrl":"10.1364/JOCN.525128","url":null,"abstract":"Optical performance monitoring is vital for enabling dynamically reconfigurable optical networks. This paper introduces a monitoring scheme that is robust to transceiver impairments for coherent digital subcarrier multiplexing (DSCM) systems that simultaneously monitors polarization-dependent loss (PDL), differential group delay (DGD), and chromatic dispersion (CD). In the proposed scheme, a pair of frequency domain pilot tones (FPTs) are inserted into the \u0000<tex>${X}$</tex>\u0000 and \u0000<tex>${Y}$</tex>\u0000 polarizations of the transmitted dual-polarization signal. Both the signal and the FPTs endure identical channel impairments during fiber transmission. At the receiver side, the transmitted FPTs are extracted to monitor the channel impairments. We begin by establishing a simplified system model using a single frequency tone to analyze the effects of system impairments on the frequency domain pilots. Based on this model, CD, PDL, and DGD are jointly and accurately estimated. In addition, the influences of temporal, amplitude, and phase mismatches between in-phase (I) and quadrature (Q) components of transceivers on channel impairment monitoring are completely eliminated. This achieves a channel impairment monitoring scheme that is robust to transceiver impairments. Experimental verification shows that the proposed scheme can jointly and accurately estimate a wide range of CD, PDL, and DGD. Additionally, the proposed monitoring scheme demonstrates strong robustness against transceiver impairments, rapid polarization fluctuations, and amplified spontaneous emission (ASE) noise.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"822-831"},"PeriodicalIF":4.0,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This Special Issue contains a collection of twelve papers on the impact of photonic technologies on future optical networks, including extensions of selected works presented at the SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) held on 5–9 November 2023 in Castelldefels, Spain. We present a brief introduction followed by an overview of the papers.
{"title":"Introduction to the JOCN Special Issue on the Impact of Photonic Technologies on Future Optical Networks","authors":"Michela Svaluto Moreolo;Joaquim Ferreira Martins-Filho","doi":"10.1364/JOCN.536639","DOIUrl":"10.1364/JOCN.536639","url":null,"abstract":"This Special Issue contains a collection of twelve papers on the impact of photonic technologies on future optical networks, including extensions of selected works presented at the SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC) held on 5–9 November 2023 in Castelldefels, Spain. We present a brief introduction followed by an overview of the papers.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"IPT1-IPT3"},"PeriodicalIF":4.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10619707","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141654732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As commercially available CubeSats with up to six standardized units cannot achieve the precision required for an instantaneous establishment of a low-divergence optical inter-satellite link, search patterns are used to scan the remaining field of uncertainty. This analysis optimizes the simultaneously executed search pattern combinations of the two laser communication terminals involved. Based on a Monte Carlo simulation, the perturbations on these links are investigated, and the corresponding key performance parameters such as mean acquisition time and success rate are calculated. The results are penalized by the hardware specifications, including actuator and sensor bandwidths, given by their design. Residual attitude error components imply a significant influence on the acquisition process and are therefore presented within this work. The pattern pairs are fed through an automated optimization algorithm to tune and analyze them. In this particular scenario of two CubeISL models, the mean duration for a first detected acquisition hit is within a pattern period of 3.2 s for the best performing pairs spiral-rose and lissajous-rose. Assuming an uncertainty field of ${pm}0.2;{rm deg}$ due to limited attitude knowledge, success rates between 82.3% and 99.9% are achieved.
{"title":"Optimization of acquisition patterns for establishing inter CubeSat optical communications","authors":"Rene Ruddenklau;Georg Schitter","doi":"10.1364/JOCN.518004","DOIUrl":"10.1364/JOCN.518004","url":null,"abstract":"As commercially available CubeSats with up to six standardized units cannot achieve the precision required for an instantaneous establishment of a low-divergence optical inter-satellite link, search patterns are used to scan the remaining field of uncertainty. This analysis optimizes the simultaneously executed search pattern combinations of the two laser communication terminals involved. Based on a Monte Carlo simulation, the perturbations on these links are investigated, and the corresponding key performance parameters such as mean acquisition time and success rate are calculated. The results are penalized by the hardware specifications, including actuator and sensor bandwidths, given by their design. Residual attitude error components imply a significant influence on the acquisition process and are therefore presented within this work. The pattern pairs are fed through an automated optimization algorithm to tune and analyze them. In this particular scenario of two CubeISL models, the mean duration for a first detected acquisition hit is within a pattern period of 3.2 s for the best performing pairs spiral-rose and lissajous-rose. Assuming an uncertainty field of \u0000<tex>${pm}0.2;{rm deg}$</tex>\u0000 due to limited attitude knowledge, success rates between 82.3% and 99.9% are achieved.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"814-821"},"PeriodicalIF":4.0,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10620312","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141865755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper reports the network operator point of view about the introduction of quantum key distribution (QKD) in optical networks to secure the data plane and/or specific applications, focusing on the design aspects that go beyond pure transmission. The functional architecture of a quantum key distribution network is depicted focusing on the integration in the existing telecommunications infrastructure. Some use cases of the utilization of the QKD layer, presenting results from in-field demonstrations, are reported together with a technology agnostic numerical model about resource sharing in a metropolitan area network environment.
{"title":"Quantum key distribution in optical fibers: a comprehensive design view of the overall quantum layer beyond transmission","authors":"Annachiara Pagano;Roberto Mercinelli;Maurizio Valvo;Antonio Manzalini","doi":"10.1364/JOCN.522626","DOIUrl":"10.1364/JOCN.522626","url":null,"abstract":"This paper reports the network operator point of view about the introduction of quantum key distribution (QKD) in optical networks to secure the data plane and/or specific applications, focusing on the design aspects that go beyond pure transmission. The functional architecture of a quantum key distribution network is depicted focusing on the integration in the existing telecommunications infrastructure. Some use cases of the utilization of the QKD layer, presenting results from in-field demonstrations, are reported together with a technology agnostic numerical model about resource sharing in a metropolitan area network environment.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"D111-D118"},"PeriodicalIF":4.0,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141687836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The advent of 6G is expected to transform connectivity by necessitating robust and scalable transport networks, capable of managing the escalating demands for enhanced bandwidth, negligible latency, and heightened network automation. The progression towards centralized radio access networks and the cloudification of network functions introduce additional requirements to the transport network. Addressing these demands, the integration of packet and optical systems combines packet flexibility with the high bandwidth and low latency of optical systems, aiming for a balance between performance, efficiency, and functionality. This process considers cost and the reuse of existing infrastructure towards a seamless transition to 6G. The concept of a Mini-ROADM, a cost-effective, energy-efficient optical switch created using silicon photonics, is presented and demonstrated in a ring network application. The role of a transport-aware end-to-end orchestrator in coordinating resources across radio, transport, and cloud domains to ensure a diverse range of quality-of-service levels is also discussed. A system demonstrator that highlights the integration of packet and optical layers and the concrete application of these concepts in a network environment is presented.
{"title":"Packet-optical transport network for future radio infrastructure","authors":"Paola Iovanna;Alberto Bianchi;Alessandra Bigongiari;Giulio Bottari;Luca Giorgi;Simone Marconi;Marzio Puleri;Stefano Stracca;Francesco Testa;Fabio Ubaldi;Roberto Sabella","doi":"10.1364/JOCN.522775","DOIUrl":"https://doi.org/10.1364/JOCN.522775","url":null,"abstract":"The advent of 6G is expected to transform connectivity by necessitating robust and scalable transport networks, capable of managing the escalating demands for enhanced bandwidth, negligible latency, and heightened network automation. The progression towards centralized radio access networks and the cloudification of network functions introduce additional requirements to the transport network. Addressing these demands, the integration of packet and optical systems combines packet flexibility with the high bandwidth and low latency of optical systems, aiming for a balance between performance, efficiency, and functionality. This process considers cost and the reuse of existing infrastructure towards a seamless transition to 6G. The concept of a Mini-ROADM, a cost-effective, energy-efficient optical switch created using silicon photonics, is presented and demonstrated in a ring network application. The role of a transport-aware end-to-end orchestrator in coordinating resources across radio, transport, and cloud domains to ensure a diverse range of quality-of-service levels is also discussed. A system demonstrator that highlights the integration of packet and optical layers and the concrete application of these concepts in a network environment is presented.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"D96-D110"},"PeriodicalIF":4.0,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141624103","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. B. F. Pinto;L. Carneiro de Souza;T. P. V. Andrade;E. S. Lima;L. G. Silva;F. M. Portelinha;E. Lee Anderson;Arismar Cerqueira S.
This paper reports two implementations of power-over-fiber (PoF) solutions applied to radio-over-fiber (RoF) and optical wireless communication (OWC) systems, in the context of an industrial environment. We employ a conventional 62.5-µm multimode fiber (MMF) to deliver optical power to different communication links based on RoF, free-space optics (FSO), and visible light communication (VLC) technologies aiming beyond 5G (B5G) and 6G applications. First, a 3.5-GHz 5G New Radio (5G NR) signal is transmitted throughout a 20-km single-mode optical fiber (SMF) link using RoF technology. Regarding the PoF system, a 5-W optical power is transmitted through a 100-m MMF link. A photovoltaic power converter (PPC) and a DC/DC converter are employed to convert the power from the optical to the electrical domain and adjust the voltage level, respectively, with the purpose of energizing a remote RoF module. The attainable optical and electrical power transmission efficiencies (OPTE and PTE) are 80% and 19%, respectively. Posterior, a second PoF system is implemented to power a hybrid RoF/FSO/VLC B5G system, comprising a 200-m MMF and an additional DC/DC converter. Over 10.5 W of optical power is transmitted to feed an electrical amplifier (EA) and a white LED from the VLC link. In this configuration, we achieve 78% and 18.5% of OPTE and PTE, respectively. Furthermore, a performance investigation based on the root mean square error vector magnitude ( ${{rm EVM}_{{rm RMS}}}$ ) metric is conducted to evaluate the signal using the implemented PoF systems and a conventional electrical power supply. In the first implementation, a throughput of 600 Mbps is achieved with 100-MHz bandwidth without performance degradation, when compared to the conventional-powered RoF system, whereas, in the second implementation, 60-Mbps throughput is achieved when employing the FSO and VLC technologies simultaneously, demonstrating the applicability and potential of the PoF technique for B5G and 6G industrial communications.
{"title":"Power-over-fiber-based optical wireless communication systems towards 6G","authors":"F. B. F. Pinto;L. Carneiro de Souza;T. P. V. Andrade;E. S. Lima;L. G. Silva;F. M. Portelinha;E. Lee Anderson;Arismar Cerqueira S.","doi":"10.1364/JOCN.522583","DOIUrl":"https://doi.org/10.1364/JOCN.522583","url":null,"abstract":"This paper reports two implementations of power-over-fiber (PoF) solutions applied to radio-over-fiber (RoF) and optical wireless communication (OWC) systems, in the context of an industrial environment. We employ a conventional 62.5-µm multimode fiber (MMF) to deliver optical power to different communication links based on RoF, free-space optics (FSO), and visible light communication (VLC) technologies aiming beyond 5G (B5G) and 6G applications. First, a 3.5-GHz 5G New Radio (5G NR) signal is transmitted throughout a 20-km single-mode optical fiber (SMF) link using RoF technology. Regarding the PoF system, a 5-W optical power is transmitted through a 100-m MMF link. A photovoltaic power converter (PPC) and a DC/DC converter are employed to convert the power from the optical to the electrical domain and adjust the voltage level, respectively, with the purpose of energizing a remote RoF module. The attainable optical and electrical power transmission efficiencies (OPTE and PTE) are 80% and 19%, respectively. Posterior, a second PoF system is implemented to power a hybrid RoF/FSO/VLC B5G system, comprising a 200-m MMF and an additional DC/DC converter. Over 10.5 W of optical power is transmitted to feed an electrical amplifier (EA) and a white LED from the VLC link. In this configuration, we achieve 78% and 18.5% of OPTE and PTE, respectively. Furthermore, a performance investigation based on the root mean square error vector magnitude (\u0000<tex>${{rm EVM}_{{rm RMS}}}$</tex>\u0000) metric is conducted to evaluate the signal using the implemented PoF systems and a conventional electrical power supply. In the first implementation, a throughput of 600 Mbps is achieved with 100-MHz bandwidth without performance degradation, when compared to the conventional-powered RoF system, whereas, in the second implementation, 60-Mbps throughput is achieved when employing the FSO and VLC technologies simultaneously, demonstrating the applicability and potential of the PoF technique for B5G and 6G industrial communications.","PeriodicalId":50103,"journal":{"name":"Journal of Optical Communications and Networking","volume":"16 8","pages":"D86-D95"},"PeriodicalIF":4.0,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141602458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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