Journal of Optical Communications最新文献_第4页

Design and investigation of filterless sixtuple RoF upconversion system with improved sideband to carrier suppression ratio using MZM extinction ratio variance 利用 MZM 消光比方差设计和研究可提高边带与载波抑制比的无滤波器六倍 RoF 上转换系统

Journal of Optical Communications Pub Date : 2024-02-02 DOI: 10.1515/joc-2023-0384

Ajay Kumar, Shelly Singla, Deepak Kedia

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A modified bandwidth allocation algorithm for XGPON network 经修改的 XGPON 网络带宽分配算法

Journal of Optical Communications Pub Date : 2024-01-31 DOI: 10.1515/joc-2023-0379

Mehul C. Patel, A. Mandloi

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Evaluating DNN and LSTM nonlinear compensators for enhanced performance in DCO-OFDM system 评估 DNN 和 LSTM 非线性补偿器，以提高 DCO-OFDM 系统的性能

Journal of Optical Communications Pub Date : 2024-01-31 DOI: 10.1515/joc-2023-0392

Gerges M. Salama, Amira A. Mohamed, H. Abdalla

{"title":"Evaluating DNN and LSTM nonlinear compensators for enhanced performance in DCO-OFDM system","authors":"Gerges M. Salama, Amira A. Mohamed, H. Abdalla","doi":"10.1515/joc-2023-0392","DOIUrl":"https://doi.org/10.1515/joc-2023-0392","url":null,"abstract":"\u0000 This study proposes a deep neural network (DNN) and long-short-term memory (LSTM) nonlinear compensators method for direct current (DC)-biased optical orthogonal frequency division multiplexing (DCO-OFDM) in indoor visible light communication (VLC) conventional to handle the nonlinearity and retrieve the high-fidelity signals, and compared in terms of performance and complexity. Unlike the data training after fast Fourier transform in existing deep neural network schemes, this study proposes a scheme that uses the time domain waveform data output by photodiodes for direct equalization. The OFDM signal at the receiving end is equalized, which can mitigate hybrid linear and nonlinear impairments and save spectrum resources without requiring the pilots’ assistance. Compared with conventional receivers based on different guide frequencies and existing DL-based reception methods, the proposed adaptive receiver approach yields better bit error rate performance at different signal-to-noise ratios. This research reveals the extreme sensitivity of the LSTM’s performance to system SNR. LSTM outperforms DNN in high signal-to-noise ratio (SNR) situations, but at low SNR, even with high complexity, LSTM falls short of DNN’s performance.","PeriodicalId":509395,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140478536","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 comparison of Duobinary, AMI, CNRZ and CSRZ for next generation FSO communication system 用于下一代 FSO 通信系统的二进制、AMI、CNRZ 和 CSRZ 性能比较

Journal of Optical Communications Pub Date : 2024-01-31 DOI: 10.1515/joc-2023-0367

Sidra Ejaz, Sawaiba Shafqat, Kainat Qureshi, Farhan Qamar, Romana Shahzadi, Mudassar Ali

引用次数: 0

Analysis of PAPR reduction of optical-OTFS for 256-QAM using companding and clipping–filtering algorithms 利用压缩和削波滤波算法降低 256-QAM 光外径调制解调器 PAPR 的分析

Journal of Optical Communications Pub Date : 2024-01-08 DOI: 10.1515/joc-2023-0369

Arun Kumar, S. Chakravarty, Aziz Nanthaamornphong

{"title":"Analysis of PAPR reduction of optical-OTFS for 256-QAM using companding and clipping–filtering algorithms","authors":"Arun Kumar, S. Chakravarty, Aziz Nanthaamornphong","doi":"10.1515/joc-2023-0369","DOIUrl":"https://doi.org/10.1515/joc-2023-0369","url":null,"abstract":"Abstract The article presents an investigation into Peak-to-Average Power Ratio (PAPR) reduction techniques in Optical Orthogonal Time Frequency Space (O-OTFS) modulation. Focusing on clipping and filtering as well as companding methods, the study explores their efficacy in mitigating PAPR challenges inherent in O-OTFS waveforms. The research evaluates the impact of these techniques on signal quality, particularly in the context of a Rician channel. Clipping and filtering (C&F) are examined for their ability to control amplitude peaks, while companding is analyzed for its role in optimizing dynamic range. The study conducts a comprehensive analysis of Bit Error Rate (BER) and power spectrum density (PSD) under varying conditions, shedding light on how these methods influence the reliability and robustness of OTFS communication. The investigation considers the interplay of these PAPR reduction methods with the unique characteristics of the Rician and Rayleigh channel, which includes a dominant line-of-sight component. The findings contribute valuable insights into designing efficient OTFS modulation systems for real-world scenarios. Ultimately, this research aims to provide a deeper understanding of PAPR reduction strategies in OTFS, offering guidance for optimizing signal processing techniques in communication systems where mitigating PAPR is crucial for achieving high performance and reliable data transmission. It is noted that the proposed C&F and companding algorithms outperform the conventional methods and achieved a PAPR gain of 1–3 dB and BER gain of 10.6–2 dB.","PeriodicalId":509395,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139379962","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

Turbulence mitigation in FSO based on turbo coding and equalization 基于涡轮编码和均衡的 FSO 湍流缓解技术

Journal of Optical Communications Pub Date : 2024-01-04 DOI: 10.1515/joc-2023-0307

Samir M. Hameed

{"title":"Turbulence mitigation in FSO based on turbo coding and equalization","authors":"Samir M. Hameed","doi":"10.1515/joc-2023-0307","DOIUrl":"https://doi.org/10.1515/joc-2023-0307","url":null,"abstract":"\u0000 Free space optical (FSO) communication has gained considerable interest for various applications because of its high speed, security, and low power consumption, which seem like promising advantages for the future. FSO systems are severely constrained by turbulence produced by air temperature and density fluctuations, resulting in scattered and distorted light beams. The capacity and bit error rate (BER) of an FSO link can be influenced by fading brought on by turbulence. Turbulence raises the BER, especially under conditions of moderate and high turbulence. The proposed model suggests using a turbo encoder with an intensity modulator at the FSO transmitter and combining maximum likelihood estimation (MLE), zero-forcing equalization (ZFE), and a turbo decoder for the direct detection receiver. However, MLE does an accurate channel estimate, which minimizes fading and turbulence. ZFE improves the quality of the link even further, while turbo coding lowers the bit error rate by increasing redundancy and greatly enhancing error-correcting capability. The Gamma–Gamma turbulence model simulation showed the proposed system’s superiority over other techniques, which achieved a BER of 10−5 with a signal-to-noise ratio (SNR) of 16 dB for moderate and strong turbulence, respectively. Consequently, even though turbo coding adds redundancy to the signal, it can achieve substantial coding gains that increase FSO capacity.","PeriodicalId":509395,"journal":{"name":"Journal of Optical Communications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140514054","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