Pub Date : 2009-09-01DOI: 10.1109/SOPO.2009.5230325
H. Moon
Lasing characteristics of resonance modes were investigated in square, hexagon, hollow square, and hollow hexagonal cavities made on an epi-wafer. In hollow polygonal semiconductor cavities, guided modes were observed in which the modes were formed by total reflections of light at both (outer and inner) boundaries. The cavity loss of guided modes in a hollow hexagonal cavity was found to be considerably reduced compared to that in a hollow square cavity. Keywords-whispering gallery mode, guided mode, hollow cavity
{"title":"Various Polygonal Semiconductor Lasers","authors":"H. Moon","doi":"10.1109/SOPO.2009.5230325","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230325","url":null,"abstract":"Lasing characteristics of resonance modes were investigated in square, hexagon, hollow square, and hollow hexagonal cavities made on an epi-wafer. In hollow polygonal semiconductor cavities, guided modes were observed in which the modes were formed by total reflections of light at both (outer and inner) boundaries. The cavity loss of guided modes in a hollow hexagonal cavity was found to be considerably reduced compared to that in a hollow square cavity. Keywords-whispering gallery mode, guided mode, hollow cavity","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72938322","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230142
Yin-guo Huang, Yu-chi Lin, W. Wang, Guimei Dong
The driving technology is a very important factor influencing the output performances of white LED (WLED).This paper proposes a kind of high-stability driver for WLED based on constant-current and constant-luminance. The working characteristics of WLED and the principle of driving WLED are introduced in this paper. The newly designed driver works in a mode of constant current LDO and it is feedback controlled by the output of WLED to obtain highly stable luminance. Finally, a test circuit is set up to validate the proposed scheme and some experiments are carried out. The results show that the driving current maintains nearly constant and the luminance of WLED is of high accuracy. Keywords-white LED; driver; constant-current; constantluminance
{"title":"Design of High-Stability Driver for White LED","authors":"Yin-guo Huang, Yu-chi Lin, W. Wang, Guimei Dong","doi":"10.1109/SOPO.2009.5230142","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230142","url":null,"abstract":"The driving technology is a very important factor influencing the output performances of white LED (WLED).This paper proposes a kind of high-stability driver for WLED based on constant-current and constant-luminance. The working characteristics of WLED and the principle of driving WLED are introduced in this paper. The newly designed driver works in a mode of constant current LDO and it is feedback controlled by the output of WLED to obtain highly stable luminance. Finally, a test circuit is set up to validate the proposed scheme and some experiments are carried out. The results show that the driving current maintains nearly constant and the luminance of WLED is of high accuracy. Keywords-white LED; driver; constant-current; constantluminance","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74288069","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230319
Jinsong Li, Xiumin Gao
Vector diffraction theory is employed to investigate the gradient force patterns of the Gaussian beams with helico-conical phase fronts. Results show that the gradient force pattern shape depends principally on topological charge of the phase . The gradient force pattern expands with increasing the parameter of the phase distribution. Therefore, one can change the topological charge or the parameter of the phase mask to construct the tunable optical trap to meet different requirements. Its potential application might include rotational positioning of particles and accumulation of smaller non-symmetric particles towards the focus. KeywordsOptical vortex; Phase fronts; Gradient force
{"title":"Gradient Force Pattern of Gaussian Beam with Helico-Conical Phase Fronts","authors":"Jinsong Li, Xiumin Gao","doi":"10.1109/SOPO.2009.5230319","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230319","url":null,"abstract":"Vector diffraction theory is employed to investigate the gradient force patterns of the Gaussian beams with helico-conical phase fronts. Results show that the gradient force pattern shape depends principally on topological charge of the phase . The gradient force pattern expands with increasing the parameter of the phase distribution. Therefore, one can change the topological charge or the parameter of the phase mask to construct the tunable optical trap to meet different requirements. Its potential application might include rotational positioning of particles and accumulation of smaller non-symmetric particles towards the focus. KeywordsOptical vortex; Phase fronts; Gradient force","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74182609","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230245
Xuezhi Hong, Changjian Guo, Ying Gao, Sailing He
A novel low-power and cost-effective OCDMA thresholder based on nonlinear polarization rotation (NPR) is proposed. The excellent performance and feasibility of the NPR thresholder are experimentally demonstrated in our 2.5 Gb/s ultrashort pulse OCDMA system. KeywordsOCDMA; MAI; Thresholder; Nonlinear fiber optics
{"title":"A Novel OCDMA Thresholder Based on Nonlinear Polarization Rotation","authors":"Xuezhi Hong, Changjian Guo, Ying Gao, Sailing He","doi":"10.1109/SOPO.2009.5230245","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230245","url":null,"abstract":"A novel low-power and cost-effective OCDMA thresholder based on nonlinear polarization rotation (NPR) is proposed. The excellent performance and feasibility of the NPR thresholder are experimentally demonstrated in our 2.5 Gb/s ultrashort pulse OCDMA system. KeywordsOCDMA; MAI; Thresholder; Nonlinear fiber optics","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85010056","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230105
Zhi-ping Yang, Xiao-ning Li
A novel blue phosphor based on phosphate host matrix, NaBaPO4 doped with Eu was prepared by solid state reaction. The phosphor invariably emits blue luminescence with a peak wavelength at 440 nm under ultraviolet excitation. The excitation spectrum is very broad extending from 300 to 450 nm, which is coupled well with the emission of UV LED (350-410 nm). The effect of doped Eu concentration on the emission intensity of NaBaPO4:Eu phosphor was also investigated and the process of energy transfer between Eu ions in NaBaPO4 phosphor should be controlled by multipole interaction. The measured of InGaN-based NaBaPO4:Eu LED shows bright blue light to the naked eye with chromatic coordinate of (0.1632, 0.1098). Keywordswhite LEDs; phosphor; Eu2+
{"title":"A Novel Blue-Emitting Phosphor NaBaPO4:Eu2+ for White LEDs","authors":"Zhi-ping Yang, Xiao-ning Li","doi":"10.1109/SOPO.2009.5230105","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230105","url":null,"abstract":"A novel blue phosphor based on phosphate host matrix, NaBaPO4 doped with Eu was prepared by solid state reaction. The phosphor invariably emits blue luminescence with a peak wavelength at 440 nm under ultraviolet excitation. The excitation spectrum is very broad extending from 300 to 450 nm, which is coupled well with the emission of UV LED (350-410 nm). The effect of doped Eu concentration on the emission intensity of NaBaPO4:Eu phosphor was also investigated and the process of energy transfer between Eu ions in NaBaPO4 phosphor should be controlled by multipole interaction. The measured of InGaN-based NaBaPO4:Eu LED shows bright blue light to the naked eye with chromatic coordinate of (0.1632, 0.1098). Keywordswhite LEDs; phosphor; Eu2+","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81912556","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230284
Yang Shen, Yuanqing Huang, Ruifang Ye, Siqi Ding, Lei Wang, Chun Lin, Yi Gu
according to theoretical analyses and experimental studies, key solutions to improve the system stability of the laser-Micro jet are proposed in this paper. An Axicon system is used to replace the optical lens which can help to decrease the strict coupling requirements on the interface between water jet and the air. And using existing theory, the bubble problem in the coupling process has been discussed, and several measures have been promoted to lower the influence of bubbles. Finally three nozzle structures have also been compared and revised to help achieving better processing performances. Keywords-Laser-Micro jet;Axicon; nozzle structure; bubble
{"title":"A New Design of The Laser-Micro Jet System","authors":"Yang Shen, Yuanqing Huang, Ruifang Ye, Siqi Ding, Lei Wang, Chun Lin, Yi Gu","doi":"10.1109/SOPO.2009.5230284","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230284","url":null,"abstract":"according to theoretical analyses and experimental studies, key solutions to improve the system stability of the laser-Micro jet are proposed in this paper. An Axicon system is used to replace the optical lens which can help to decrease the strict coupling requirements on the interface between water jet and the air. And using existing theory, the bubble problem in the coupling process has been discussed, and several measures have been promoted to lower the influence of bubbles. Finally three nozzle structures have also been compared and revised to help achieving better processing performances. Keywords-Laser-Micro jet;Axicon; nozzle structure; bubble","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81987022","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230162
Yu-De Wang, Changsheng Xie
In this paper we describe Evolutionary Storage System, a Self-Managing Storage System that could adjust its storage strategy automatically according to the current running environment. In the evolutionary processes, ESS could automatically choose one system organizing strategy which fits for the current running environment best, to keep the dynamic balance of the whole storage system. One of the three evolutionary ways is data distribution evolutionary, the data distribution strategy considers both the application data accessing frequency and physical disk performance, and adjust the data distribution automatically to optimize the storage system read/write performance.We have constructed a simulation model to demonstrate how the system performance could be improved by applying the data distribution strategy.
{"title":"Data Distribution Strategy Research on One Self-Managing Storage System","authors":"Yu-De Wang, Changsheng Xie","doi":"10.1109/SOPO.2009.5230162","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230162","url":null,"abstract":"In this paper we describe Evolutionary Storage System, a Self-Managing Storage System that could adjust its storage strategy automatically according to the current running environment. In the evolutionary processes, ESS could automatically choose one system organizing strategy which fits for the current running environment best, to keep the dynamic balance of the whole storage system. One of the three evolutionary ways is data distribution evolutionary, the data distribution strategy considers both the application data accessing frequency and physical disk performance, and adjust the data distribution automatically to optimize the storage system read/write performance.We have constructed a simulation model to demonstrate how the system performance could be improved by applying the data distribution strategy.","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84145456","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230314
Jianping Shi, Shurong Yang, K. Dong, Songlin Wen, Xu'nan Chen
We report the effect of irradiation electric field on nonlinear optical materials. Firstly the calculation model of the irradiation electric field of high energy charged particles with typical radiation parameters is presented. Then based on the anionic group theory and finite field method, we research the
{"title":"New Irradiation Damage Mechanism of Nonlinear Optical Materials under High-Energy Charged Particles","authors":"Jianping Shi, Shurong Yang, K. Dong, Songlin Wen, Xu'nan Chen","doi":"10.1109/SOPO.2009.5230314","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230314","url":null,"abstract":"We report the effect of irradiation electric field on nonlinear optical materials. Firstly the calculation model of the irradiation electric field of high energy charged particles with typical radiation parameters is presented. Then based on the anionic group theory and finite field method, we research the","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85494725","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230280
Zehe Wang, Min Liu, Jinggang Yi, Y. Xing, Jiangtao Liu
Farming is an important component of the Agronomic, setting depth tillage is an important aspect of precision agriculture. In this paper, a set of deep tillage system was designed through the use of laser technology, hydraulic technology and control technology. Thesis studied about the working principle of deep farming system, the working principle, information flows of laser, hydraulic and control circuit and the relationship among them. Experiments show that the system has good consistency of deep tillage and is easy to operate.
{"title":"Study on Setting Depth Farming System Based on Laser Technology","authors":"Zehe Wang, Min Liu, Jinggang Yi, Y. Xing, Jiangtao Liu","doi":"10.1109/SOPO.2009.5230280","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230280","url":null,"abstract":"Farming is an important component of the Agronomic, setting depth tillage is an important aspect of precision agriculture. In this paper, a set of deep tillage system was designed through the use of laser technology, hydraulic technology and control technology. Thesis studied about the working principle of deep farming system, the working principle, information flows of laser, hydraulic and control circuit and the relationship among them. Experiments show that the system has good consistency of deep tillage and is easy to operate.","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81750089","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 : 2009-09-01DOI: 10.1109/SOPO.2009.5230251
Z. Le, Bisheng Quan, Ming Zhang, Arun Kumar Somani, D. Lastine, K. Balakrishnan
In this paper we consider unidirectional optical busses that originate at a convener node and end at a terminator node. Nodes can transmit only to nodes that are farther downstream, hence the convener node can not receive any bus traffic and the terminator node can not place any information on the bus. The bus supports both data traffic which is bursty as well as connections between source to destination pairs. We assume there exists a control channel outside of the bus that lets the terminator node send information to the convener node. We propose a cycle based protocol where in each cycle all nodes send their requirement to the terminator node which then sends out estimated requirements via the convener node. Then in a distributed computation individual nodes compute their utilization for that cycle based on their priority while paying attention to fair allocation for itself and other nodes. In the process a node may adjust its priority above or below the predicted value. Using simulation we evaluated of the capacity fairness and preemption fairness per node under the constraint of maximum access delay. In order to solve this problem, in this paper we consider unidirectional optical busses that originate at a convener node and end at a terminator node. Nodes can transmit only to nodes that are farther downstream, hence the convener node can not receive any bus traffic and the terminator node can not place any information on the bus. The bus supports both data traffic which is bursty as well as connections between source to destination pairs. We assume there exists a control channel outside of the bus that lets the terminator node send information to the convener node. For this type of network we propose a cycle based protocol where in each cycle all nodes send their requirement to the terminator node which then sends out estimated requirements via the convener node. Then in a distributed computation individual nodes compute their utilization for that cycle based on their priority while paying attention to fair allocation for itself and other nodes. In the process a node may adjust its priority above or below the predicted value. Using simulation we evaluated of the capacity fairness and preemption fairness per node under the constraint of maximum access delay.
{"title":"Optimal Utilization with Fairness and Priority Considerations in Optical Networks Based on Light Trail","authors":"Z. Le, Bisheng Quan, Ming Zhang, Arun Kumar Somani, D. Lastine, K. Balakrishnan","doi":"10.1109/SOPO.2009.5230251","DOIUrl":"https://doi.org/10.1109/SOPO.2009.5230251","url":null,"abstract":"In this paper we consider unidirectional optical busses that originate at a convener node and end at a terminator node. Nodes can transmit only to nodes that are farther downstream, hence the convener node can not receive any bus traffic and the terminator node can not place any information on the bus. The bus supports both data traffic which is bursty as well as connections between source to destination pairs. We assume there exists a control channel outside of the bus that lets the terminator node send information to the convener node. We propose a cycle based protocol where in each cycle all nodes send their requirement to the terminator node which then sends out estimated requirements via the convener node. Then in a distributed computation individual nodes compute their utilization for that cycle based on their priority while paying attention to fair allocation for itself and other nodes. In the process a node may adjust its priority above or below the predicted value. Using simulation we evaluated of the capacity fairness and preemption fairness per node under the constraint of maximum access delay. In order to solve this problem, in this paper we consider unidirectional optical busses that originate at a convener node and end at a terminator node. Nodes can transmit only to nodes that are farther downstream, hence the convener node can not receive any bus traffic and the terminator node can not place any information on the bus. The bus supports both data traffic which is bursty as well as connections between source to destination pairs. We assume there exists a control channel outside of the bus that lets the terminator node send information to the convener node. For this type of network we propose a cycle based protocol where in each cycle all nodes send their requirement to the terminator node which then sends out estimated requirements via the convener node. Then in a distributed computation individual nodes compute their utilization for that cycle based on their priority while paying attention to fair allocation for itself and other nodes. In the process a node may adjust its priority above or below the predicted value. Using simulation we evaluated of the capacity fairness and preemption fairness per node under the constraint of maximum access delay.","PeriodicalId":6416,"journal":{"name":"2009 Symposium on Photonics and Optoelectronics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2009-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83285013","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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