Iet Optoelectronics最新文献_第4页

Optical Digital‐To‐Analog Converters (oDACs): A Solution to Overcome the Limitations of Conventional High‐Speed Optical Transmitters 光学数模转换器（odac）：克服传统高速光发射机局限性的解决方案

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2026-01-01 DOI: 10.1049/ote2.70021

Konstantinos Moschopoulos,Stylianos Sygletos,Vassilis Tsourtis,Elias Giacoumidis,André Richter,Moshe Nazarathy,Ioannis Tomkos

{"title":"Optical Digital‐To‐Analog Converters (oDACs): A Solution to Overcome the Limitations of Conventional High‐Speed Optical Transmitters","authors":"Konstantinos Moschopoulos,Stylianos Sygletos,Vassilis Tsourtis,Elias Giacoumidis,André Richter,Moshe Nazarathy,Ioannis Tomkos","doi":"10.1049/ote2.70021","DOIUrl":"https://doi.org/10.1049/ote2.70021","url":null,"abstract":"ABSTRACT The continuous increase of data traffic demands necessitates evolution of optical communication systems towards larger capacities enabled by highly performing optical transmitters that generate multilevel and multidimensional ultrahigh data rate signals. Commercially deployed transmitters rely on high‐order electronic digital‐to‐analog converters (eDACs) that drive optical Mach–Zehnder Modulators (MZMs) under particular biasing/driving conditions. However, these conventional transmitters face bandwidth and power consumption limitations arising from the eDACs and the nonlinearity of MZMs transfer function among others. Recently, alternative transmitter architectures have been proposed to perform direct digital to optical conversion, by relying on the utilisation of lower‐order eDACs/drivers in combination with an increased number of MZMs operated with different biasing/driving conditions compared to the conventional transmitters, which are configured in either serial cascade or parallel stacking configurations. These novel transmitter architectures are referred as serial or parallel ‘Optical DACs’ (oDACs) enabling ultrahigh data rate and improved signal quality. In this article, we first discuss the issues of conventional optical transmitters and subsequently analyse selected oDAC architectures that solely rely on simple NRZ drivers or PAM4 eDACs. Simulation studies demonstrate their superior bit rate scalability (up to 3.2 Tbps) and analysis of power consumption reveals savings of about 40% comparing with conventional architectures.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"53 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148893672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance Analysis of the LDPC-Coded Hybrid LQAM-MPPM for UWOC Systems UWOC系统ldpc编码混合LQAM-MPPM的性能分析

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-12-30 DOI: 10.1049/ote2.70025

Hongyan Jiang, Wanyi Hu, Xin Liao, Ning He, Wasiu Popoola, Ahmad Fairuz Omar, Sujan Rajbhandari

{"title":"Performance Analysis of the LDPC-Coded Hybrid LQAM-MPPM for UWOC Systems","authors":"Hongyan Jiang, Wanyi Hu, Xin Liao, Ning He, Wasiu Popoola, Ahmad Fairuz Omar, Sujan Rajbhandari","doi":"10.1049/ote2.70025","DOIUrl":"https://doi.org/10.1049/ote2.70025","url":null,"abstract":"This paper proposes a hybrid optical modulation scheme that integrates spectrally efficient quadrature amplitude modulation (QAM) and power-efficient multipulse pulse position modulation (MPPM) for underwater wireless optical communication (UWOC) to achieve high spectral and energy efficiencies and combines it with LDPC codes to mitigate the adverse effects imposed by the underwater turbulence channel. Considering the effect of both direct-current (DC) bias level and modulation index on signal-to-noise ratio (SNR), for the first time, an approximate closed-form bit error rate (BER) expression for the hybrid L-QAM-MPPM UWOC system over turbulence channels is derived and verified using Monte Carlo (MC) simulations. Subsequently, comparisons among the hybrid L-QAM-MPPM, conventional MPPM and QAM systems with comparable spectral efficiency for exponentiated Weibull (EW)-modelled turbulence channel indicate that hybrid modulation offers resilience to turbulence, although the BER in the additive white Gaussian noise (AWGN)-only channel is higher. Finally, the effectiveness of LDPC codes in improving the performance of hybrid modulations is discussed, with coded 128-QAM-(12, 2) MPPM offering ∼6.5 and 5.8 dB code gains at a BER of <math>\u0000 <semantics>\u0000 <mrow>\u0000 <msup>\u0000 <mn>10</mn>\u0000 <mrow>\u0000 <mo>−</mo>\u0000 <mn>4</mn>\u0000 </mrow>\u0000 </msup>\u0000 </mrow>\u0000 <annotation> ${10}^{-4}$</annotation>\u0000 </semantics></math> in strong and moderate turbulence, respectively. These results demonstrate the promise of hybrid modulation with LDPC as a robust and efficient modulation scheme for UWOC systems.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"20 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.70025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-12-30

引用次数: 0

Erratum to ‘Deep Learning-Based Design of Binary Signalling for Optical Wireless Communication Systems With 2D Receiver’ 基于深度学习的二维接收光无线通信系统二进制信号设计勘误表

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-10-18 DOI: 10.1049/ote2.70023

引用次数: 0

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-09-30

引用次数: 0

Feasibility of C-Band Converged Satellite-Fibre QKD Links Through Telescope-to-SMF Coupling 通过望远镜到smf耦合的c波段融合卫星-光纤QKD链路的可行性

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-09-30 DOI: 10.1049/ote2.70020

Aristeidis Stathis, Argiris Ntanos, Panagiotis Kourelias, Nikolaos K. Lyras, Giannis Giannoulis, Athanasios D. Panagopoulos, Hercules Avramopoulos

{"title":"Feasibility of C-Band Converged Satellite-Fibre QKD Links Through Telescope-to-SMF Coupling","authors":"Aristeidis Stathis, Argiris Ntanos, Panagiotis Kourelias, Nikolaos K. Lyras, Giannis Giannoulis, Athanasios D. Panagopoulos, Hercules Avramopoulos","doi":"10.1049/ote2.70020","DOIUrl":"10.1049/ote2.70020","url":null,"abstract":"This study presents a comprehensive feasibility analysis of low Earth orbit (LEO) satellite-to-ground downlink communication for quantum key distribution (QKD), focusing on 1550 nm wavelength. This wavelength is selected for its compatibility with terrestrial fibre-optic networks, allowing the distribution of quantum keys over extended distances. The analysis models a discrete variable decoy state BB84 protocol, emphasising the system's design requirements for the optical ground station (OGS) receiver, including critical parameters that affect single-mode fibre (SMF) coupling efficiency. Through extended simulations, we assess atmospheric conditions, turbulence effects and adaptive optics (AO) correction to evaluate their impact on light coupling efficiency and achievable key rates. Results highlight the advantage of AO in sustaining secure key rates, particularly under high-elevation satellite passes, and quantify the key volumes attainable across varying levels of turbulence and additional fibre transmission losses. Our findings demonstrate that LEO satellite-based QKD downlinks can be feasibly integrated with terrestrial fibre systems, supporting secure key distribution over potentially large geographic areas without requiring OGSs to be trusted nodes. The results of this work provide practical insights into the technical requirements and configurations needed to realise robust satellite-to-ground QKD links, laying a foundation for future advancements in global quantum-secure communication infrastructure.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"19 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.70020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145224489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

Time Span of an Image Frame Using a CMOS Sensor in Rolling Shutter-Based Optical Camera Communications 在基于滚动快门的光学相机通信中使用CMOS传感器的图像帧时间跨度

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-09-24 DOI: 10.1049/ote2.70022

Raul Zamorano-Illanes, Zabih Ghassemlooy, Xicong Li, Othman Younus, Stanislav Zvánovec, Ismael Soto

{"title":"Time Span of an Image Frame Using a CMOS Sensor in Rolling Shutter-Based Optical Camera Communications","authors":"Raul Zamorano-Illanes, Zabih Ghassemlooy, Xicong Li, Othman Younus, Stanislav Zvánovec, Ismael Soto","doi":"10.1049/ote2.70022","DOIUrl":"10.1049/ote2.70022","url":null,"abstract":"In this paper, a rolling shutter optical camera communication system is investigated by analysing the internal working principle of a receiver based on complementary metal oxide semiconductor image sensors. Based on the thorough analysis of system parameters such as the clock signal, integration and read-out times at the sensor level, and the calculation of the bandwidth and the time span of the image frame containing the information signal, it was demonstrated that the communication functionalities can be enhanced. A new model was proposed and validated by developing an experimental testbed and demonstrating matching between the data packet duration and the predicted time span. This enables the optimisation of the samples obtained by the image postprocessing, using different sensor clock signals and evaluating the bit error rate performances. The experimental results demonstrated that the internal design of the camera and its packet structures have impacts on the read-out times. For camera settings of pixel clock frequency and exposure time of 300 MHz and 61 <math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>μ</mi>\u0000 </mrow>\u0000 <annotation> ${upmu }$</annotation>\u0000 </semantics></math>s, respectively, a data rate of 14.5 kbps at a bit error rate below the forward error correction limit has been achieved.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"19 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.70022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145146382","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-09-24

引用次数: 0

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-09-20

引用次数: 0

Real-Time Monitoring of Milk Fermentation Process Using Highly-Sensitive Fibre Bragg Grating Stress Sensor 利用高灵敏度光纤光栅应力传感器实时监测牛奶发酵过程

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2025-09-20 DOI: 10.1049/ote2.70019

Jawad Mirza, Ahmad Atieh, Muhammad Ijaz, Salman Ghafoor, Firdos Kanwal, Fahad A. Alzahrani

{"title":"Real-Time Monitoring of Milk Fermentation Process Using Highly-Sensitive Fibre Bragg Grating Stress Sensor","authors":"Jawad Mirza, Ahmad Atieh, Muhammad Ijaz, Salman Ghafoor, Firdos Kanwal, Fahad A. Alzahrani","doi":"10.1049/ote2.70019","DOIUrl":"10.1049/ote2.70019","url":null,"abstract":"Continuous monitoring of milk fermentation process during industrial yogurt production using pH metres is often cumbersome and inefficient technique. A simple, cost-effective and accurate alternative sensing technology is required for real-time monitoring. In this paper, we report real-time continuous monitoring of milk fermentation process and determine the fermentation end point during yogurt production using highly-sensitive fibre Bragg grating (FBG) stress sensor. Milk fermentation is monitored in real-time by analysing the shift in the Bragg wavelength of FBG stress sensor inserted into the milk corresponding to time-dependent gradual increase in applied stress on FBG stress sensor because of yogurt coagulation. Required sensitivities for an FBG sensor used for milk having 0% and 2.5% fat are around 3.03 and 3.01 pm/Pa, respectively. A proof of the concept of a smart alarm system (AS) for determination of the fermentation end point of yogurt is discussed in this work. This study presents a cost-effective, simple and non-destructive method for continuous real-time monitoring of milk fermentation process and determination of fermentation end point for small as well as large-scale production of yogurt.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"19 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.70019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145102128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

引用次数: 0