Pub Date : 2019-04-01DOI: 10.1109/WACOWC.2019.8770189
A. Gholipour
At optical frequencies metals are penetrated by electromagnetic fields and interact with the incident waves like lossy dielectrics with negative index. Therefore, a single metallic wire can make a waveguide to convey the optical waves. This characteristic entails considering the field distributions inside the metallic single wire for correct analysis of plasmonic waves. The surface impedance technique relaxes this condition by modeling the interior fields with surface impedance. The accuracy of this method as well as its domain of validity is studied by comparing it with two other well-known techniques namely analytical solution and the method of moment (MoM). It is shown that the surface impedance model can be accurate at terahertz and infrared frequencies when the field distributions in exterior domain are desired.
{"title":"Using the Surface Impedance Model to Analyze Plasmonic Modes of a Circular Single Wire at Terahertz and Optical Frequencies","authors":"A. Gholipour","doi":"10.1109/WACOWC.2019.8770189","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770189","url":null,"abstract":"At optical frequencies metals are penetrated by electromagnetic fields and interact with the incident waves like lossy dielectrics with negative index. Therefore, a single metallic wire can make a waveguide to convey the optical waves. This characteristic entails considering the field distributions inside the metallic single wire for correct analysis of plasmonic waves. The surface impedance technique relaxes this condition by modeling the interior fields with surface impedance. The accuracy of this method as well as its domain of validity is studied by comparing it with two other well-known techniques namely analytical solution and the method of moment (MoM). It is shown that the surface impedance model can be accurate at terahertz and infrared frequencies when the field distributions in exterior domain are desired.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"214 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115564768","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}
Pub Date : 2019-04-01DOI: 10.1109/WACOWC.2019.8770213
N. Chaudhary, L. N. Alves, Zabih Ghassemblooy
This paper describes a visible light position system relying on a single transmitter to infer position information. The system adopts a reverse trilateration scheme, where a set of three photodiodes is employed to estimate the position. The reverse trilateration scheme adopted for this system, yields to a very simple mathematical framework, suitable for low power and low complexity systems. The position information is inferred through Rx signal strength, without the need for sophisticated angle measurements or precise synchronization as is the case in angle of arrival and time difference of arrival systems. Simulation results show that the proposed system shows high susceptibility to noise, thus requiring high signal to noise ratios in order to achieve low positioning errors.
{"title":"Feasibility Study of Reverse Trilateration Strategy with a Single Tx for VLP","authors":"N. Chaudhary, L. N. Alves, Zabih Ghassemblooy","doi":"10.1109/WACOWC.2019.8770213","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770213","url":null,"abstract":"This paper describes a visible light position system relying on a single transmitter to infer position information. The system adopts a reverse trilateration scheme, where a set of three photodiodes is employed to estimate the position. The reverse trilateration scheme adopted for this system, yields to a very simple mathematical framework, suitable for low power and low complexity systems. The position information is inferred through Rx signal strength, without the need for sophisticated angle measurements or precise synchronization as is the case in angle of arrival and time difference of arrival systems. Simulation results show that the proposed system shows high susceptibility to noise, thus requiring high signal to noise ratios in order to achieve low positioning errors.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115030424","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}
Pub Date : 2019-04-01DOI: 10.1109/WACOWC.2019.8770194
Pooria Tabeshmehr, A. Olfat, Zabih Ghassemlooy, S. Zvánovec
In this paper, we theoretically investigate the impact of power allocation for subcarriers on the bit error rate (BER)performance of a non-orthogonal variable multi-band carrier-less amplitude and phase modulation (m-CAP)scheme within the contest of visible light communications. We consider subcarriers with different bandwidth as well as sub-carrier with overlapping in order to efficiently utilize the passband region of the system frequency response for data transmission. We show that, for the proposed scheme the average BER performance is improved by up to 20% compared to the conventional m-CAP system.
{"title":"Non-Orthogonal Variable Multi-Band Carrier-Less Amplitude and Phase Modulation with Reduced Subcarriers","authors":"Pooria Tabeshmehr, A. Olfat, Zabih Ghassemlooy, S. Zvánovec","doi":"10.1109/WACOWC.2019.8770194","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770194","url":null,"abstract":"In this paper, we theoretically investigate the impact of power allocation for subcarriers on the bit error rate (BER)performance of a non-orthogonal variable multi-band carrier-less amplitude and phase modulation (m-CAP)scheme within the contest of visible light communications. We consider subcarriers with different bandwidth as well as sub-carrier with overlapping in order to efficiently utilize the passband region of the system frequency response for data transmission. We show that, for the proposed scheme the average BER performance is improved by up to 20% compared to the conventional m-CAP system.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133413366","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}
Pub Date : 2019-04-01DOI: 10.1109/WACOWC.2019.8770193
Armin Makvandi, Y. Kavian
In this paper, the medium access control (MAC)layer performance of the IEEE 802.15.7 standard is evaluated. The MAC layer is implemented on a visible light communication (VLC)network. The star topology and the line-of-sight (LOS)configuration is chosen for the network. This network is consist of a coordinator and four nodes. We built these devices based on analog components and the microcontroller. The throughput of the network is evaluated by calculating the percentage of successful transmissions. Also, the success percentage of each node in the network is examined to evaluate the fairness in the network. The experimental results show that fairness is not met in the network. Also, by increasing the number of nodes in the network the throughput is decreased.
{"title":"Experimental Demonstration of IEEE 802.15.7 MAC Layer in Visible Light Communication Sensor Network","authors":"Armin Makvandi, Y. Kavian","doi":"10.1109/WACOWC.2019.8770193","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770193","url":null,"abstract":"In this paper, the medium access control (MAC)layer performance of the IEEE 802.15.7 standard is evaluated. The MAC layer is implemented on a visible light communication (VLC)network. The star topology and the line-of-sight (LOS)configuration is chosen for the network. This network is consist of a coordinator and four nodes. We built these devices based on analog components and the microcontroller. The throughput of the network is evaluated by calculating the percentage of successful transmissions. Also, the success percentage of each node in the network is examined to evaluate the fairness in the network. The experimental results show that fairness is not met in the network. Also, by increasing the number of nodes in the network the throughput is decreased.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116994980","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}
Pub Date : 2019-04-01DOI: 10.1109/WACOWC.2019.8770185
A. Minoofar, A. Askarpour, A. Abdipour
Using Optical Angular Momentum as an orthogonal degree of freedom to multiplex data is an emerging solution for enhancing system capacity in optical communication. Spiral phase plates are used to convert a Gaussian beam to a Laguerre-Gauss beam with a desired topological charge. Analytical formulas for calculating conversion ratio of OAM modes passing through a spiral phase plate is demonstrated. With this conversion ratio efficiency and crosstalk of the communication link is also discussed.
{"title":"Efficiency and Crosstalk in Demultiplexing Orbital Angular Momentum Modes Using a Spiral Phase Plate","authors":"A. Minoofar, A. Askarpour, A. Abdipour","doi":"10.1109/WACOWC.2019.8770185","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770185","url":null,"abstract":"Using Optical Angular Momentum as an orthogonal degree of freedom to multiplex data is an emerging solution for enhancing system capacity in optical communication. Spiral phase plates are used to convert a Gaussian beam to a Laguerre-Gauss beam with a desired topological charge. Analytical formulas for calculating conversion ratio of OAM modes passing through a spiral phase plate is demonstrated. With this conversion ratio efficiency and crosstalk of the communication link is also discussed.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125242314","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}
Pub Date : 2019-04-01DOI: 10.1109/WACOWC.2019.8770199
Samira Lotfi, A. Gholami, M. Sedghi
Silicon-organic hybrid photodetectors (HPD)could be considered as a replacement for expensive low-bandgap photodetectors, thanks to their low-cost fabrication process and the possibility to realize large surface and also large array of photodetectors which is advantageous for wireless optical communications. In silicon-organic HPDs, the light absorption occurs effectively at the heterojunction interface. The difference of energy levels at the silicon-organic heterojunction interface provides a valid energy state for hybrid charge transfer excitons and accordingly, the absorption at the interface is justified by excitonic absorption. We analyzed and modeled the infrared silicon-organic hybrid photodetectors in both dynamic and steady-state conditions. According to the results, a silicon organic HPD was designed with 175 MHz operating bandwidth which could be applicable in many optical wireless communication systems.
{"title":"Investigation of Infrared Silicon-Organic Photodetectors","authors":"Samira Lotfi, A. Gholami, M. Sedghi","doi":"10.1109/WACOWC.2019.8770199","DOIUrl":"https://doi.org/10.1109/WACOWC.2019.8770199","url":null,"abstract":"Silicon-organic hybrid photodetectors (HPD)could be considered as a replacement for expensive low-bandgap photodetectors, thanks to their low-cost fabrication process and the possibility to realize large surface and also large array of photodetectors which is advantageous for wireless optical communications. In silicon-organic HPDs, the light absorption occurs effectively at the heterojunction interface. The difference of energy levels at the silicon-organic heterojunction interface provides a valid energy state for hybrid charge transfer excitons and accordingly, the absorption at the interface is justified by excitonic absorption. We analyzed and modeled the infrared silicon-organic hybrid photodetectors in both dynamic and steady-state conditions. According to the results, a silicon organic HPD was designed with 175 MHz operating bandwidth which could be applicable in many optical wireless communication systems.","PeriodicalId":375524,"journal":{"name":"2019 2nd West Asian Colloquium on Optical Wireless Communications (WACOWC)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129612675","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}
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