Iet Optoelectronics最新文献_第9页

Optimal power allocation in serial relay-assisted underwater wireless optical communication systems 串行中继辅助水下无线光通信系统的最佳功率分配

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-09-03 DOI: 10.1049/ote2.12079

Hamed Rabbani, S. Alireza Nezamalhosseini, Lawrence R. Chen, AliAsghar Beheshti-Shirazi

{"title":"Optimal power allocation in serial relay-assisted underwater wireless optical communication systems","authors":"Hamed Rabbani, S. Alireza Nezamalhosseini, Lawrence R. Chen, AliAsghar Beheshti-Shirazi","doi":"10.1049/ote2.12079","DOIUrl":"10.1049/ote2.12079","url":null,"abstract":"For a serial relaying underwater wireless optical communication (UWOC) system with ON-OFF keying modulation, we theoretically evaluate the optimal power allocation techniques in order to minimise the end-to-end bit error rate (BER), subject to transmission power constraints. At first, we evaluate the end-to-end BER with respect to all degrading effects of the UWOC channel, namely scattering, absorption, and turbulence-induced fading and then develop a closed-form BER expression as a function of transceiver parameters and water type. The optimal power allocation methods are obtained using the perfect channel state information available at the receiver (CSIR) and transmitter (CSIT) for both detect-and-forward (DF) and amplify-and-forward (AF) serial relaying systems. For each relaying method, we consider a dual-hop UWOC system and determine optimal power allocation to minimise the BER. Afterwards, the optimal power allocation in a multi-hop system is obtained to minimise the end-to-end BER. Compared to the equal power allocation, our results illustrate that UWOC relaying systems with optimal power allocation can significantly improve the end-to-end BER and expand the communication link. For instance, the proposed power allocation method for the DF and AF relay node in a 60 m single relay system improves the system performance at the BER of 10−5 by 2.5 and 1.8 dB compared to the equal power allocation, respectively.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"17 1","pages":"12-23"},"PeriodicalIF":1.6,"publicationDate":"2022-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44548792","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: 1

Optical gas sensing of sub-ppm SO2F2 and SOF2 from SF6 decomposition based on photoacoustic spectroscopy 基于光声光谱的SF6分解中亚ppm SO2F2和SOF2的光学气敏

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-08-11 DOI: 10.1049/ote2.12077

Ying Zhang, Mingwei Wang, Pengcheng Yu, Zhe Liu

{"title":"Optical gas sensing of sub-ppm SO2F2 and SOF2 from SF6 decomposition based on photoacoustic spectroscopy","authors":"Ying Zhang, Mingwei Wang, Pengcheng Yu, Zhe Liu","doi":"10.1049/ote2.12077","DOIUrl":"10.1049/ote2.12077","url":null,"abstract":"SF6 has been recognized worldwide as the main insulating gas for Gas-Insulated Switchgear (GIS). It is often required to accurately and effectively detect typical SF6 decomposition. In this paper, a sub-ppm-level SO2F2 and SOF2 gas sensor based on photoacoustic spectroscopy (PAS) is proposed and demonstrated. The steel resonant photoacoustic cell with a resonant frequency of 1750 Hz was designed and fabricated. The harmonic detection technique in wavelength modulation spectroscopy was applied to improve the signal-to-noise ratio. A mercury-cadmium-telluride photodetector was added in the PAS system to monitor the input optical power, in order to compensate for the errors caused by power fluctuations. SO2F2 and SOF2 were measured by using distributed feedback quantum cascade lasers at 6648 and 7463 nm, respectively. The results show that the proposed sensor performed with favourable linearity within the dynamic range, and reached the minimum detection limit of 0.22 ppm for SO2F2 and 0.28 ppm for SOF2, which indicated its great potential for monitoring the decomposition process of SF6 in GIS.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 6","pages":"277-282"},"PeriodicalIF":1.6,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49097039","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: 3

A 1 × 48 large-scale multi-mode fibre optical switch 1 × 48大型多模光纤交换机

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-07-07 DOI: 10.1049/ote2.12076

Zhentian Shan, Zhujun Wan, Zhixiang Luo

引用次数: 0

Curvature prediction of long-period fibre grating based on random forest regression 基于随机森林回归的长周期光纤光栅曲率预测

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-07-06 DOI: 10.1049/ote2.12078

Xingliu Hu, Haifei Si, Quanyi Ye, Yan Zhang

{"title":"Curvature prediction of long-period fibre grating based on random forest regression","authors":"Xingliu Hu, Haifei Si, Quanyi Ye, Yan Zhang","doi":"10.1049/ote2.12078","DOIUrl":"10.1049/ote2.12078","url":null,"abstract":"This study proposes a long-period fibre grating (LPFG) curvature estimation method based on random forest regression (RFR) to address the shortcomings of the existing curvature evaluation method, namely, polynomial fitting; these shortcomings cause difficulty in achieving adequate model regularity and application universality. The resonant wavelength and resonant peak amplitude of the LPFG are used as input variables in this method to develop an RFR model for curvature estimation, allowing for accurate curvature prediction of the sample. The results show that the RFR-based LPFG curvature prediction model can better characterise the input–output regression relationship than back-propagation neural networks. The average R2 value of the RFR model is 0.9826, and the actual measured curvature value is highly correlated with the model predicted curvature value. Compared to that exhibited by back-propagation neural networks, the RFR model exhibits higher accuracy for curvature estimation, with average values of 0.1314 and 0.1173 for root mean square and mean absolute errors, respectively. This method can provide a more comprehensive theoretical basis for the application of robot learning in the curvature measurement of LPFG and has practical value.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 5","pages":"225-233"},"PeriodicalIF":1.6,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43193722","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

A new complexity reduction scheme in selective mapping-based visible light communication direct current-biased optical orthogonal frequency division multiplexing systems 一种基于选择性映射的可见光通信直流偏置光正交频分复用系统的复杂度降低新方案

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-06-29 DOI: 10.1049/ote2.12074

Chakravarthy Gunturu, Sivaprasad Valluri

{"title":"A new complexity reduction scheme in selective mapping-based visible light communication direct current-biased optical orthogonal frequency division multiplexing systems","authors":"Chakravarthy Gunturu, Sivaprasad Valluri","doi":"10.1049/ote2.12074","DOIUrl":"10.1049/ote2.12074","url":null,"abstract":"Visible light communication (VLC) has emerged as a good accompaniment to radio-frequency (RF) technologies by deploying multicarrier schemes such as orthogonal frequency division multiplexing (OFDM). However, the coherent summation of carriers in the OFDM system leads to a high peak-to-average-power ratio (PAPR), causing non-linear clipping distortion at the transmitting light-emitting diode. This intricacy becomes a potential barrier for intensity modulation and limits the VLC systems' bandwidth. In the literature, non-distorting PAPR lowering approaches, such as the selective mapping (SLM) approach, have been confirmed as the most effective strategy for reducing ineludible high PAPR in optical OFDM systems among all other available techniques. Besides its astounding performance, the computational complexity also becomes a major complication in SLM due to the generation of multiple candidates. This paper proposes a computational complexity minimisation approach using inherit system properties in the SLM-based PAPR suppression method for VLC systems, where the phase sequence vectors are considered periodic. The alternative direct current-biased optical orthogonal frequency division multiplexing candidates for the single frequency-domain data block are generated with the periodic phase rotation vector. The evaluation of the complexity analysis and the simulation results shows that the mitigation of computational complexity surpasses the standard SLM technique.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 5","pages":"207-217"},"PeriodicalIF":1.6,"publicationDate":"2022-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44295946","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: 4

Self-starting generation of tri-band frequencies using a dual-parallel Mach–Zehnder modulator-based optoelectronic oscillator 使用双并联马赫-曾德尔调制器的光电振荡器自启动三频带频率的产生

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-06-23 DOI: 10.1049/ote2.12075

Quanjing Zhao, Juanjuan Yan

引用次数: 0

Optical likelihood calculation for quadrature phase-shift keying signal based on silicon integrated waveguide 基于硅集成波导的正交相移键控信号的光学似然计算

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-06-14 DOI: 10.1049/ote2.12071

Yohei Aikawa

{"title":"Optical likelihood calculation for quadrature phase-shift keying signal based on silicon integrated waveguide","authors":"Yohei Aikawa","doi":"10.1049/ote2.12071","DOIUrl":"10.1049/ote2.12071","url":null,"abstract":"All-optical likelihood calculation has the potential to improve the performance of operating speed and power consumption in future communication systems. The author previously proposed a novel scheme of likelihood calculation, which is capable of applying multi-value modulation. However, these studies have a limitation that requires higher integration into an actual system. In this study, an optical device of likelihood calculation for a 4-bit quadrature phase-shift keying (QPSK) modulated signal (i.e. two sequential QPSK symbols) is demonstrated. The integrated device consists of two delayed interferometers with silicon waveguide. The device is designed according to the types of 4-bit code string as follows (00 00), (00 11), (11 00), and (11 11), and the output light waveform from the device is observed by an oscilloscope for a plurality of 4-bit QPSK signals. The light intensity obtained from the device accurately corresponds to the Hamming distance between the code string and the input signal. The results indicate that the proposed scheme correctly calculates a likelihood for a 4-bit QPSK signal at 10 Gbaud.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 4","pages":"188-194"},"PeriodicalIF":1.6,"publicationDate":"2022-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47380014","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

The high-efficiency co-design and the measurement verification of high-bandwidth silicon photonic microring modulator 高带宽硅光子微环调制器的高效协同设计与测量验证

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-06-09 DOI: 10.1049/ote2.12070

Yue Wu, Huimin He, Rui Cao, Fengman Liu

{"title":"The high-efficiency co-design and the measurement verification of high-bandwidth silicon photonic microring modulator","authors":"Yue Wu, Huimin He, Rui Cao, Fengman Liu","doi":"10.1049/ote2.12070","DOIUrl":"10.1049/ote2.12070","url":null,"abstract":"The microring modulator (MRM) is a small-size and low-power component, which is the potential for the next-generation optical interconnection. By the theoretical analysis, increasing the electrical bandwidth, which is relevant to the cross section and the doping concentration of the doping region, is a better way to increase electro-optical (EO) bandwidth. Therefore, a new doping profile of the PN depletion region with 4 doping concentration levels is introduced considering the electrical bandwidth. Based on the new doping profile, the MRM with the 160 μm length and the 0.33 and 0.2 μm coupling space are determined considering the trade-off between the EO bandwidth, quality factor (Q), extinction ratio, area of MRM, and power consumption. Moreover, the MRM is characterised and is applied in a wavelength division multiplexing transmitter. By the measurement, the transmitter with the designed MRM could transmit PAM4 signal at 52 Gbps rate, which indicates the MRM could be potential for the 50 Gbps/ch optical interconnection.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 6","pages":"257-265"},"PeriodicalIF":1.6,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42398777","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

Plasmonic wideband GST-based switch in the near-infrared region 近红外区域等离子宽带gst开关

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-06-01 DOI: 10.1049/ote2.12073

Saman Heidari, Najmeh Nozhat

引用次数: 3

Tungsten disulfide coated side-polished fibre as polarisation state modulator in all-optical system 二硫化钨包覆侧抛光光纤在全光系统中的偏振态调制器

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2022-05-27 DOI: 10.1049/ote2.12072

Zian Cheak Tiu, Sin Jin Tan, Muhamad Zharif Samion, Harith Ahmad, Sulaiman Wadi Harun, Chee Leong Tan

引用次数: 1