Journal of Optical Communications最新文献_第9页

Analysis of atmospheric attenuation of a FSO–WDM system for long-range communication 远距离通信FSO-WDM系统的大气衰减分析

Journal of Optical Communications Pub Date : 2023-08-04 DOI: 10.1515/joc-2023-0157

Sowmyaa Vathsan M S, Kasthuri P, Prakash Poornachari, S. A

{"title":"Analysis of atmospheric attenuation of a FSO–WDM system for long-range communication","authors":"Sowmyaa Vathsan M S, Kasthuri P, Prakash Poornachari, S. A","doi":"10.1515/joc-2023-0157","DOIUrl":"https://doi.org/10.1515/joc-2023-0157","url":null,"abstract":"Abstract An FSO system can provide a solution to the problem of last-mile connectivity while also offering a high degree of security and a large capacity for high-speed information transmission, making it a versatile and powerful option for data communication. Despite the above-mentioned advantages, some factors have to be considered when establishing long-range communication, one such factor is atmospheric turbulence (haze, light fog, moderate fog) which degrades the ideal characteristics of the FSO channel and causes a loss in the signal’s power. This loss of power during transmission can be improved by using suitable amplifiers (hybrid optical amplifier, semiconductor optical amplifier) to provide better performance. The next-generation networks must be capable of supporting a significant amount of backhaul data traffic, accommodating a larger number of users, and increasing channel capacity to meet the demands of modern data communication. By implementing wavelength division multiplexing (WDM) and free space optical (FSO) communication techniques, the capacity of the channel can be increased, and more users can be accommodated. The maximum link length offered by the FSO–WDM system has been investigated with hybrid optical amplifier considering the minimum bit error rate, which can provide reliable and long-distance communication.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48277150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Artificial neural network based load balancing scheme for top of rack switches in optical data centers 基于人工神经网络的光数据中心机架顶部交换机负载均衡方案

Journal of Optical Communications Pub Date : 2023-08-03 DOI: 10.1515/joc-2023-0189

Madhukar Prashant Shukla, Poonam Keswani, B. Keswani

{"title":"Artificial neural network based load balancing scheme for top of rack switches in optical data centers","authors":"Madhukar Prashant Shukla, Poonam Keswani, B. Keswani","doi":"10.1515/joc-2023-0189","DOIUrl":"https://doi.org/10.1515/joc-2023-0189","url":null,"abstract":"Abstract Data centers serve as dedicated facilities for housing computer systems and their related components, including telecommunications and storage systems. They typically have high levels of security and environmental controls to ensure that the equipment housed within them functions optimally. Data center networks (DCNs) often employ load balancing algorithms to handle large volumes of traffic and ensure that all servers and switches are utilized equally, keeping the network running smoothly. However, as load on the server varies, therefore dynamic traffic management systems that can adjust traffic flow in real-time based on the current traffic state is required. This study presents an artificial neural network-based load balancing method. By training a feed-forward artificial neural network (ANN) using a back propagation (BP) learning algorithm, it evenly distributes workload over all of the nodes. Simulation results are also presented to prove the usefulness of the proposed load balancing mechanism. It is found that the load balancing scheme can reduce the packet blocking probability (PBP) by 10 folds and delay by about nearly 11 percent.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42263099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Free space optical communication in Indian cities; channel characteristics and link performance 印度城市的自由空间光通信；信道特性和链路性能

Journal of Optical Communications Pub Date : 2023-08-03 DOI: 10.1515/joc-2023-0181

Sandeep Rajput, Yashwant Acharya

{"title":"Free space optical communication in Indian cities; channel characteristics and link performance","authors":"Sandeep Rajput, Yashwant Acharya","doi":"10.1515/joc-2023-0181","DOIUrl":"https://doi.org/10.1515/joc-2023-0181","url":null,"abstract":"Abstract Free Space Optical (FSO) communication systems, offering high-speed and high-bandwidth transmission, have emerged as a possible substitute for conventional wired and wireless communication systems. However, FSO links are susceptible to atmospheric deficiencies including attenuation, scintillation, and turbulence, which may severely impact the performance of the communication link. In this research paper, we propose and analyze the performance of a 25 Gbps dual-polarization quadrature phase shift keying (DP-QPSK) coherent optical orthogonal frequency division multiplexing (CO-OFDM)-based FSO communication link with spatial diversity technique under various climatic conditions in four different geographical locations of India, i.e., Delhi, Ahmedabad, Kolkata, and Chennai in the year 2021. The proposed FSO communication system is evaluated through performance analysis and parametric evaluation under various weather conditions such as clear sky, fog, haze, rain, cloud, and thermal gradient. Key performance metrics such as bit error rate (BER), Q-factor, signal-to-noise ratio (SNR), received power, communication range, and reliability are analyzed based on the simulation results. The proposed FSO communication system provides high data rates, improved power efficiency, better resilience to atmospheric impairments, reliable communication links under different weather conditions, and a practical solution for high-speed and high-bandwidth communication in various applications.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42664224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating the effects of material reflectivity and atmospheric attenuation on photonic radar performance in free space optical channels 自由空间光通道中材料反射率和大气衰减对光子雷达性能影响的评估

Journal of Optical Communications Pub Date : 2023-07-31 DOI: 10.1515/joc-2023-0176

Abhishek Sharma, J. Malhotra

引用次数: 2

Investigation of channel state information conditions in VL-NOMA using power allocation technique for 6G network 基于6G网络功率分配技术的VL-NOMA信道状态信息条件研究

Journal of Optical Communications Pub Date : 2023-07-28 DOI: 10.1515/joc-2023-0064

C. E. Ngene, P. Thakur, G. Singh

{"title":"Investigation of channel state information conditions in VL-NOMA using power allocation technique for 6G network","authors":"C. E. Ngene, P. Thakur, G. Singh","doi":"10.1515/joc-2023-0064","DOIUrl":"https://doi.org/10.1515/joc-2023-0064","url":null,"abstract":"Abstract This paper investigates the channel state information (CSI) conditions in visible light non-orthogonal multiple access (VL-NOMA) using the power allocation technique (PA) for a sixth-generation (6G) network. One light-emitting diode (LED) is used as a carrier to transmit the signal to three-user-positioned at certain distances. The challenge of allocating power to the system is solved using the PA technique. The PA technique uses to assign signal powers to the three users. The VL-NOMA channel with CSI symbols is synchronized for the performance of signal propagation. We deployed perfect CSI, imperfect CSI, and partial CSI to coordinate the signal enhancement that results in an improved data rate, higher channel capacity, and improved signal-to-noise ratio (SNR). The synchronized system model guarantees successful signal enhancement where perfect CSI performs better than partial CSI and imperfect CSI. We have enabled interference plus noise to see how the system behaves. We notice low channel capacity region, low data rate performance, etc. Hence, we analyse the PA to determine the outage probability effect on the signal.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41736773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Rain effects analysis on image transmission through free space optical communication system 雨水对自由空间光通信系统图像传输的影响分析

Journal of Optical Communications Pub Date : 2023-07-28 DOI: 10.1515/joc-2023-0165

Amina Djir, F. Meskine, M. Tayebi

{"title":"Rain effects analysis on image transmission through free space optical communication system","authors":"Amina Djir, F. Meskine, M. Tayebi","doi":"10.1515/joc-2023-0165","DOIUrl":"https://doi.org/10.1515/joc-2023-0165","url":null,"abstract":"Abstract Free Space optics (FSO) has gained significant interest in recent years due to its ability to provide a more secure communication connection than conventional radio links, being relatively inexpensive compared to other wireless systems, and the fact that it operates without any interference from other wireless devices. FSO also has a downside in its susceptibility to certain environmental conditions, which can degrade the quality of the connection by absorbing, scattering, and refracting the optical beams. This paper discusses the rain attenuation effect on RGB image transmission through an FSO communication system. The study uses different metrics to analyze system performance and suggests increasing transmission power to improve performance during heavy rainfall. The findings suggest that for medium and heavy rain, an improvement in maximum link distances of 490 m and 340 m, respectively, is obtained as the transmission power increases to 15 mW. The paper also proposes a spatial domain image restoration technique to enhance image quality at the receiver using the median and wiener filters. Results show that the proposed solutions increase the communication range of the FSO link by 320 m and 205 m for moderate and heavy rain, respectively, when the transmitting power is about 10 mW.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48469348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance investigation of contention and monitoring in long-reach passive optical networks 远距离无源光网络中争用与监控的性能研究

Journal of Optical Communications Pub Date : 2023-07-25 DOI: 10.1515/joc-2023-0159

Shippu Sachdeva, Manoj Sindhwani, G.V. Singh, Abhishek Kumar, Prasad Rasane, Jyoti Singh

引用次数: 0

Analysis of throughput and error rate of 16-QAM, 64-QAM, and 256-QAM O-NOMA waveforms 16-QAM、64-QAM和256-QAM O-NOMA波形的吞吐量和误码率分析

Journal of Optical Communications Pub Date : 2023-07-25 DOI: 10.1515/joc-2023-0200

Arun Kumar, Nidhi Gour, Himanshu Sharma

{"title":"Analysis of throughput and error rate of 16-QAM, 64-QAM, and 256-QAM O-NOMA waveforms","authors":"Arun Kumar, Nidhi Gour, Himanshu Sharma","doi":"10.1515/joc-2023-0200","DOIUrl":"https://doi.org/10.1515/joc-2023-0200","url":null,"abstract":"Abstract This study presents a comprehensive analysis of the throughput performance, spectrum efficiency, and block error rate (BLER) of optical non-orthogonal multiple access (O-NOMA) waveforms using 16-quadrature amplitude modulation (QAM), 64-QAM, and 256-QAM modulation schemes. The aim is to assess the trade-offs between data rate, spectral efficiency, and error performance in O-NOMA systems. The analysis reveals that higher-order modulations, such as 64-QAM and 256-QAM, offer higher data rates and improved spectrum efficiency compared to 16-QAM. Furthermore, the study investigates the spectrum performance of the O-NOMA waveforms. The results indicate that higher-order modulations may utilise the spectrum more efficiently, maximising the data throughput within the available bandwidth. Moreover, the BLER analysis provides insights into the error performance of the O-NOMA waveforms. It quantifies the probability of errors occurring in a block of transmitted data and evaluates the system’s reliability. The analysis reveals that 256-QAM O-NOMA achieves lower BLER and high throughput in uplink and downlink as compared with the 16 and 64-QAM O-NOMA frameworks.","PeriodicalId":16675,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44320618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Performance investigation for the WDM-passive optical network using multicarrier source 基于多载波源的WDM无源光网络性能研究

Journal of Optical Communications Pub Date : 2023-07-25 DOI: 10.1515/joc-2023-0147

Ibrahim Luay, T. S. Mansour

引用次数: 0

Design mode filtering interferometer using etched double clad fiber 用蚀刻双包层光纤设计模式滤波干涉仪

Journal of Optical Communications Pub Date : 2023-07-25 DOI: 10.1515/joc-2023-0151

Mohanad G. Khamees, T. S. Mansour

引用次数: 0