Iet Optoelectronics最新文献_第10页

Fast spatial orthogonal frequency-division multiplexing based on two-dimensional discrete cosine transform for a pixelated optical wireless communication system 基于二维离散余弦变换的快速空间正交频分复用像素化无线光通信系统

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-09-30 DOI: 10.1049/ote2.12059

Zi-Xin Xu, Longtao Bi, Qingqing Chen

{"title":"Fast spatial orthogonal frequency-division multiplexing based on two-dimensional discrete cosine transform for a pixelated optical wireless communication system","authors":"Zi-Xin Xu, Longtao Bi, Qingqing Chen","doi":"10.1049/ote2.12059","DOIUrl":"10.1049/ote2.12059","url":null,"abstract":"Pixelated two-dimensional (2-D) optical wireless communication systems, with intensity-modulation and direct-detection (IM/DD), are capable to transmit data at high data rates by modulating the data into image intensities at the transmitter. Frequency division modulation (FDM) and space-domain modulation (SDM) are two common modulation schemes in a 2-D pixelated system. Generally, FDM is preferred because FDM benefits from the capability of controlling the spectrum of transmitting signals so that the output signal could be shaped according to the characteristics of a particular optical channel. However, the computational complexity of FDM is relatively high and complex computation is needed at both the transmitter and the receiver. In this work, a fast orthogonal frequency-division multiplexing (FOFDM) modulation which employs 2-D inverse discrete cosine transform (IDCT2) instead of 2-D inverse Fourier transform (IFFT2) is presented. As the image intensities must be real and positive, two schemes are hereby introduced to generate unipolar image intensities. The proposed FOFDM is simulated and discussed in terms of key characterisations including the signal spectrum, spectral efficiency, peak to average power ratio (PAPR), bit error ratio (BER) and computational complexity. Compared with traditional spatial orthogonal frequency-division multiplexing (OFDM) based on IFFT2, the proposed FOFDM has similar BER performance, twice the spatial efficiency for the same constellation size, lower computational complexity and a much simpler structure in the transmitter.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 2","pages":"81-91"},"PeriodicalIF":1.6,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41778090","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 BER performance of a FSO system with polar codes under weak turbulence 弱湍流条件下极码FSO系统的误码率性能

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-09-16 DOI: 10.1049/ote2.12058

Nithin Mohan, Zabih Ghassemlooy, Emma Li, Mojtaba Mansour Abadi, Stanislav Zvanovec, Ralph Hudson, Zun Htay

{"title":"The BER performance of a FSO system with polar codes under weak turbulence","authors":"Nithin Mohan, Zabih Ghassemlooy, Emma Li, Mojtaba Mansour Abadi, Stanislav Zvanovec, Ralph Hudson, Zun Htay","doi":"10.1049/ote2.12058","DOIUrl":"10.1049/ote2.12058","url":null,"abstract":"The key challenge in free space optical (FSO) communications is combating turbulence-induced fading. As the channel fading in FSO is quasi-static, the transmission parameters such as the code rates, transmit power and modulation schemes can be modified with respect to the channel state information transmitted via the feedback path. As a result, adaptive channel coding is considered as one of the practical approaches to improve the FSO link performance. In this study, the FSO system with polar codes is investigated and its performance is analysed by determining the optimum code-rate required to achieve a bit error rate of 10−9 under weak turbulence. It is shown that, using Monte-Carlo simulations for the scintillation indices of 0.12 and 0.2, the successive cancelation list (SCL) decoder offers coding gains of 2.5 and 0.3 dB, respectively, as compared with SC decoder, and for the scintillation index of 0.31, the SC decoder offers a coding gain of 2.5 dB compared to that of the SCL decoder for the code rate.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 2","pages":"72-80"},"PeriodicalIF":1.6,"publicationDate":"2021-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12058","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49035808","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

Performance analysis of transmissive modified cladding optical fibre sensors 透射型修正包层光纤传感器性能分析

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-09-06 DOI: 10.1049/ote2.12057

Hamed Dehdashti Jahromi

{"title":"Performance analysis of transmissive modified cladding optical fibre sensors","authors":"Hamed Dehdashti Jahromi","doi":"10.1049/ote2.12057","DOIUrl":"10.1049/ote2.12057","url":null,"abstract":"Optical fibre sensors with modified cladding have been a topic of great interest for decades. Thanks to the new techniques of fabricating nanostructured films, this interest has been renewed. Although there have been many increases in published experimental research, no comprehensive theoretical formulation of the structure is reported in the literature. In this study, a general theory for transmissive modified cladding optical fibre sensors is presented. The model is formulated based on the electromagnetic fields and optical power in the core and cladding of a step-index fibre. The model considers various parameters, especially the radius of the optical fibre core, modified cladding refractive index, and light wavelength. The sensitivity, response, and optical transmission of the sensor are analysed as a function of the parameters. The analyses show that optical transmission reduces dramatically when the modified cladding refractive index approaches the refractive index of the core of the fibre and results in higher sensor response and sensitivity. Increasing the core radius of the fibre will result in lower sensor response with higher sensitivity. Both parameters will increase for a light with a larger wavelength. The results are in good agreement with experimental evidence.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 2","pages":"63-71"},"PeriodicalIF":1.6,"publicationDate":"2021-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46396568","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: 2

White-light visible light communications based on multiple photoluminescence of fluorescent acrylic sheets 基于荧光亚克力片材多重光致发光的白光可见光通信

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-09-03 DOI: 10.1049/ote2.12056

Seonghyeon Cho, Yoonji Yoo, Yeonkyeong Lee, Changseop Lee, Hyunchae Chun

引用次数: 0

A 3D controllable diffraction-limited spot array generated by means of a spaced-dipole array 一种利用空间偶极子阵列产生的三维可控限制衍射光斑阵列

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-08-31 DOI: 10.1049/ote2.12055

Yanzhong Yu, Han Huang, Shunda Lin, Yongxi Zeng, Musheng Chen, Qiwen Zhan

{"title":"A 3D controllable diffraction-limited spot array generated by means of a spaced-dipole array","authors":"Yanzhong Yu, Han Huang, Shunda Lin, Yongxi Zeng, Musheng Chen, Qiwen Zhan","doi":"10.1049/ote2.12055","DOIUrl":"10.1049/ote2.12055","url":null,"abstract":"The creation of an array of three-dimensional (3D) multifocal spots in the focal region has attracted interest due to potential applications in parallel or simultaneous process areas. Based on the theory of pattern synthesis of antenna array and the electromagnetic time reversal technique, an optimisation-free approach is reported to construct a 3D controllable diffraction-limited spot array in the focal volume of a 4pi focussing system formed by two high-numerical-aperture (NA) objectives. The proposed method can be implemented readily by inversely focussing the field radiated from a virtual spaced-dipole antenna array mounted at the focus of the 4pi configuration. By solving the inverse problem, the required illumination in the pupil plane for producing the 3D spot array can be found. It is demonstrated that the 3D diffraction-limited focal spot array owns the properties of controllable polarisation, scheduled number, tunable location, and adjustable interval. This array may find applications in 3D simultaneous optical manipulation and trapping, 3D parallel fabrication, 3D optical data storage, and so on.","PeriodicalId":13408,"journal":{"name":"Iet Optoelectronics","volume":"16 2","pages":"47-55"},"PeriodicalIF":1.6,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ietresearch.onlinelibrary.wiley.com/doi/epdf/10.1049/ote2.12055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49171768","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: 2

Design of planar waveguide directional couplers with arbitrary modal electric field 任意模态电场平面波导定向耦合器的设计

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-07-16 DOI: 10.1049/ote2.12054

Anthony Boucouvalas, Kostas Angelis, Konstantinos Aidinis, Min Zhan, Danshi Wang

引用次数: 0

Optical Properties of Single Crystals 单晶的光学性质

IF 1.6 4区计算机科学

Iet Optoelectronics Pub Date : 2021-06-23 DOI: 10.5772/intechopen.95607

S. Chandran, Srinivasan Manikam