Pub Date : 2012-12-01DOI: 10.1109/PGC.2012.6457920
Jiangtao Lv, Qiongchan Gu, Xiaoxiao Jiang, G. Si, Zhenhe Ma, Fengwen Wang
A method for the detection of Chinese traditional medicine injection concentration is designed which is based on the fiber transducer technology and the fluorescence analyzing technology. It adopts a sphere fiber-optics probe to realize the highly active caption and transmission of the fluorescence signal. The charge-coupled devices(CCD) is used to realize the high efficiency detection of the fluorescence spectrum. The fluorescence is highly active light spitted by the function of the spatial dispersion and plane focusing of the concave grating and the optoelectronic conversion of the CCD. It formatted the spectrum on the focal plane of the CCD. The spectrum is converted to the electric pressure signal by the CCD detection. The experiment indicates that the system has a minimum detecting limit of the density is 0.04ppm.The partial least squares (PLS) is used to get the the linear regression of the samples. The value of the RMSEP is 0.1631.
{"title":"The fiber-optic sensing fluorescence detection system for Chinese traditional medicine injection based on charge-coupled devices","authors":"Jiangtao Lv, Qiongchan Gu, Xiaoxiao Jiang, G. Si, Zhenhe Ma, Fengwen Wang","doi":"10.1109/PGC.2012.6457920","DOIUrl":"https://doi.org/10.1109/PGC.2012.6457920","url":null,"abstract":"A method for the detection of Chinese traditional medicine injection concentration is designed which is based on the fiber transducer technology and the fluorescence analyzing technology. It adopts a sphere fiber-optics probe to realize the highly active caption and transmission of the fluorescence signal. The charge-coupled devices(CCD) is used to realize the high efficiency detection of the fluorescence spectrum. The fluorescence is highly active light spitted by the function of the spatial dispersion and plane focusing of the concave grating and the optoelectronic conversion of the CCD. It formatted the spectrum on the focal plane of the CCD. The spectrum is converted to the electric pressure signal by the CCD detection. The experiment indicates that the system has a minimum detecting limit of the density is 0.04ppm.The partial least squares (PLS) is used to get the the linear regression of the samples. The value of the RMSEP is 0.1631.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114540131","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 : 2012-12-01DOI: 10.1109/PGC.2012.6458079
T. Mei, Q. J. Zhao, D. H. Zhang
Among methods modeling electronic structures of low dimensional heterostructures, such as first principles, tight binding, k·p, etc., the multiband k·p method is the most effective for low dimensional systems with a big compilation of atoms such as quantum dots. Numerical implementation like the finite difference method and the finite element method engages differential or integral process and thus requires a 3D-space mesh. In our developed Fourier transform-based k·p method (FTM), both Hamiltonian matrix and envelope functions are formulated in Fourier domain. The analytical Fourier transform of the 3D shape function of the object can be adopted such that meshing 3D space is avoidable in retrieving eigen solutions of k·p equations. Both the kinetic part and the strain have been incorporated in the Hamiltonian equation. The FTM demonstrates advantage on controlling spurious solutions due to its inborn cut-off process, whereas incorporation of Burt-Foreman operator ordering further enhances the merit.
{"title":"Fourier transform-based k·p method: An approach to meshless modeling of low-dimensional heterostructures","authors":"T. Mei, Q. J. Zhao, D. H. Zhang","doi":"10.1109/PGC.2012.6458079","DOIUrl":"https://doi.org/10.1109/PGC.2012.6458079","url":null,"abstract":"Among methods modeling electronic structures of low dimensional heterostructures, such as first principles, tight binding, k·p, etc., the multiband k·p method is the most effective for low dimensional systems with a big compilation of atoms such as quantum dots. Numerical implementation like the finite difference method and the finite element method engages differential or integral process and thus requires a 3D-space mesh. In our developed Fourier transform-based k·p method (FTM), both Hamiltonian matrix and envelope functions are formulated in Fourier domain. The analytical Fourier transform of the 3D shape function of the object can be adopted such that meshing 3D space is avoidable in retrieving eigen solutions of k·p equations. Both the kinetic part and the strain have been incorporated in the Hamiltonian equation. The FTM demonstrates advantage on controlling spurious solutions due to its inborn cut-off process, whereas incorporation of Burt-Foreman operator ordering further enhances the merit.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123515578","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 : 2012-12-01DOI: 10.1109/PGC.2012.6457936
M. A. Talukder
We study the gain recovery dynamics of quantum cascade lasers when the operating conditions such as electric field and temperature vary. We find that gain becomes positive from negative and gradually increases as the applied electric field increases from zero. We also find that as the temperature increases, gain decreases with a reduction in the depletion of the gain when the pump pulse interacts. The recovery becomes faster with less coherent oscillations as the temperature increases.
{"title":"Gain recovery dynamics of quantum cascade lasers","authors":"M. A. Talukder","doi":"10.1109/PGC.2012.6457936","DOIUrl":"https://doi.org/10.1109/PGC.2012.6457936","url":null,"abstract":"We study the gain recovery dynamics of quantum cascade lasers when the operating conditions such as electric field and temperature vary. We find that gain becomes positive from negative and gradually increases as the applied electric field increases from zero. We also find that as the temperature increases, gain decreases with a reduction in the depletion of the gain when the pump pulse interacts. The recovery becomes faster with less coherent oscillations as the temperature increases.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"820 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123536527","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 : 2012-12-01DOI: 10.1109/PGC.2012.6458078
J. Troles, L. Brilland
Chalcogenide glasses are known for their large transparency in the mid-infrared and their high linear refractive index (>;2). They present also a high non-linear coefficient (n2), 100 to 1000 times larger than for silica, depending on the composition. we have developed a casting method to prepare the chalcogenide preform. This method allows optical losses as low as 0.4 dB/m at 1.55 μm and less than 0.05 dB/m in the mid IR. Our group has prepared various chalcogenide MOFs operating in the IR range in order to associate the high non-linear properties of these glasses and the original MOF properties. For example, small core fibers have been drawn to enhance the non linearities for telecom applications such as signal regeneration and generation of supercontinuum sources. On another hand, in the 3-12 μm window, single mode fibers and exposed core fibers have been realized for Gaussian beams propagation and sensors applications respectively.
{"title":"Chalcogenide microstructured optical fibers","authors":"J. Troles, L. Brilland","doi":"10.1109/PGC.2012.6458078","DOIUrl":"https://doi.org/10.1109/PGC.2012.6458078","url":null,"abstract":"Chalcogenide glasses are known for their large transparency in the mid-infrared and their high linear refractive index (>;2). They present also a high non-linear coefficient (n2), 100 to 1000 times larger than for silica, depending on the composition. we have developed a casting method to prepare the chalcogenide preform. This method allows optical losses as low as 0.4 dB/m at 1.55 μm and less than 0.05 dB/m in the mid IR. Our group has prepared various chalcogenide MOFs operating in the IR range in order to associate the high non-linear properties of these glasses and the original MOF properties. For example, small core fibers have been drawn to enhance the non linearities for telecom applications such as signal regeneration and generation of supercontinuum sources. On another hand, in the 3-12 μm window, single mode fibers and exposed core fibers have been realized for Gaussian beams propagation and sensors applications respectively.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124462046","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 : 2012-12-01DOI: 10.1109/PGC.2012.6458085
N. Wang, F. Tan, Xuming Zhang
In this paper, the experimental studies utilize the photoelectrocatalytic effect to eliminate another fundamental limit of photocatalysis - the recombination of photo-excited electrons and holes. Two transparent ITO glass slides are used as eletrodes and both the positive and negative bias potentials are applied across the reaction chamber. It turns out that the negative bias always exhibits higher performance. Under -1.8 V, the degradation rate is independent of the residence time, showing that the accompanying electrolysis can solve the problem of oxygen deficiency. Synergetic effect of photocatalysis and electrocatalysis is observed to reach the maximum under the bias potential of ± 1.5 V.
{"title":"Photocatalytic water purification using planar microreactor","authors":"N. Wang, F. Tan, Xuming Zhang","doi":"10.1109/PGC.2012.6458085","DOIUrl":"https://doi.org/10.1109/PGC.2012.6458085","url":null,"abstract":"In this paper, the experimental studies utilize the photoelectrocatalytic effect to eliminate another fundamental limit of photocatalysis - the recombination of photo-excited electrons and holes. Two transparent ITO glass slides are used as eletrodes and both the positive and negative bias potentials are applied across the reaction chamber. It turns out that the negative bias always exhibits higher performance. Under -1.8 V, the degradation rate is independent of the residence time, showing that the accompanying electrolysis can solve the problem of oxygen deficiency. Synergetic effect of photocatalysis and electrocatalysis is observed to reach the maximum under the bias potential of ± 1.5 V.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129860966","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 : 2012-12-01DOI: 10.1109/PGC.2012.6457997
S. Mirjalili, K. Abedi, S. Mirjalili
Oblique Ring-Shape-Hole Photonic Crystal Waveguides (ORSHPCW) is a popular structure in designing optical buffers attracted many attentions recently. There are some parameters such as the radiuses of holes and pillars in the first two rows adjacent to defect that have significant effects on slow light properties. Consequently, one of the promising methods for effectively slowing the light speed down and controlling dispersion is to optimize these parameters, which is the motivation of this study. Particle Swarm Optimization (PSO) algorithm is one of the best proposed heuristic optimization algorithms in Artificial Intelligence applied to many engineering problem. In this work, this algorithm is employed to find the best values of the aforementioned radiuses for maximizing Normalized Delay-Bandwidth Product (NDBP) of ORSHPCW structure as the first systematic optimizer. Calculation results show that there is 30% improvement compared to the previous works, which is considered as a substantial achievement in this field.
{"title":"Light property and optical buffer performance enhancement using Particle Swarm Optimization in Oblique Ring-Shape-Hole Photonic Crystal Waveguide","authors":"S. Mirjalili, K. Abedi, S. Mirjalili","doi":"10.1109/PGC.2012.6457997","DOIUrl":"https://doi.org/10.1109/PGC.2012.6457997","url":null,"abstract":"Oblique Ring-Shape-Hole Photonic Crystal Waveguides (ORSHPCW) is a popular structure in designing optical buffers attracted many attentions recently. There are some parameters such as the radiuses of holes and pillars in the first two rows adjacent to defect that have significant effects on slow light properties. Consequently, one of the promising methods for effectively slowing the light speed down and controlling dispersion is to optimize these parameters, which is the motivation of this study. Particle Swarm Optimization (PSO) algorithm is one of the best proposed heuristic optimization algorithms in Artificial Intelligence applied to many engineering problem. In this work, this algorithm is employed to find the best values of the aforementioned radiuses for maximizing Normalized Delay-Bandwidth Product (NDBP) of ORSHPCW structure as the first systematic optimizer. Calculation results show that there is 30% improvement compared to the previous works, which is considered as a substantial achievement in this field.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128909696","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 : 2012-12-01DOI: 10.1109/PGC.2012.6458025
M. Dias, E. Wong
We previously proposed an energy-efficient Just-In-Time based dynamic bandwidth allocation algorithm for the 10 Gbps Ethernet Passive Optical Network. The algorithm exploits the capability of the Vertical-Cavity Surface-Emitting Optical Laser based Optical Network Units to operate in sleep or doze mode during its idle time. The algorithm takes into account the upstream traffic demand at the Optical Network Units in determining the bandwidth allocated to each Optical Network Unit during each cycle, thus eliminating possible collisions in the network. In this work we evaluate the performance of the Vertical-Cavity Surface-Emitting Laser and the Distributed Feedback Laser based Optical Network Units under the proposed algorithm. The simulation results indicate that the Vertical-Cavity Surface-Emitting Laser based Optical Network Unit outperforms the DFB ONU in terms of the energy efficiency using the proposed algorithm.
{"title":"Performance evaluation of VCSEL ONU using energy-efficient Just-In-Time dynamic bandwidth allocation algorithm","authors":"M. Dias, E. Wong","doi":"10.1109/PGC.2012.6458025","DOIUrl":"https://doi.org/10.1109/PGC.2012.6458025","url":null,"abstract":"We previously proposed an energy-efficient Just-In-Time based dynamic bandwidth allocation algorithm for the 10 Gbps Ethernet Passive Optical Network. The algorithm exploits the capability of the Vertical-Cavity Surface-Emitting Optical Laser based Optical Network Units to operate in sleep or doze mode during its idle time. The algorithm takes into account the upstream traffic demand at the Optical Network Units in determining the bandwidth allocated to each Optical Network Unit during each cycle, thus eliminating possible collisions in the network. In this work we evaluate the performance of the Vertical-Cavity Surface-Emitting Laser and the Distributed Feedback Laser based Optical Network Units under the proposed algorithm. The simulation results indicate that the Vertical-Cavity Surface-Emitting Laser based Optical Network Unit outperforms the DFB ONU in terms of the energy efficiency using the proposed algorithm.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129154327","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 : 2012-12-01DOI: 10.1109/PGC.2012.6457982
L. Luo, G. Wiederhecker, K. Preston, M. Lipson
We demonstrate the ability to tailor the resonance dependence on input power in silicon microring resonators using a passive technique by utilizing two counteracting processes, free carrier dispersion blueshift and thermo-optic redshift. In our fabricated silicon microring resonators, we achieve an effective blueshift, as well as effective redshift. We also design and fabricate a power insenstive silicon microring that has a five-fold improvement in cavity energy handling capability compared to a regular microring.
{"title":"Tailored resonance dependence on input optical power in silicon microring resonators","authors":"L. Luo, G. Wiederhecker, K. Preston, M. Lipson","doi":"10.1109/PGC.2012.6457982","DOIUrl":"https://doi.org/10.1109/PGC.2012.6457982","url":null,"abstract":"We demonstrate the ability to tailor the resonance dependence on input power in silicon microring resonators using a passive technique by utilizing two counteracting processes, free carrier dispersion blueshift and thermo-optic redshift. In our fabricated silicon microring resonators, we achieve an effective blueshift, as well as effective redshift. We also design and fabricate a power insenstive silicon microring that has a five-fold improvement in cavity energy handling capability compared to a regular microring.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130674244","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 : 2012-12-01DOI: 10.1109/PGC.2012.6458106
M. Balasubramanian, R. Singhal
An Electro-optic switch based on Poly(3,4-ethylenedioxythiophene)-Poly(stryene sulfonate) (PEDOT-PSS) electrodes is designed and presented in the paper. An easy-to-fabricate structure of single-mode electro-optic (EO) polymeric waveguide switch based on a Nonlinear Optical (NLO) Polymer is used and analyzed. Electro-optically active waveguides are designed in a photo-definable polymer SU-8 doped with NLO chromophore tri-cyano-vinylidene-di-phenyl-aminobenzene (TCVDPA).
{"title":"All-polymer Electro-optic switch","authors":"M. Balasubramanian, R. Singhal","doi":"10.1109/PGC.2012.6458106","DOIUrl":"https://doi.org/10.1109/PGC.2012.6458106","url":null,"abstract":"An Electro-optic switch based on Poly(3,4-ethylenedioxythiophene)-Poly(stryene sulfonate) (PEDOT-PSS) electrodes is designed and presented in the paper. An easy-to-fabricate structure of single-mode electro-optic (EO) polymeric waveguide switch based on a Nonlinear Optical (NLO) Polymer is used and analyzed. Electro-optically active waveguides are designed in a photo-definable polymer SU-8 doped with NLO chromophore tri-cyano-vinylidene-di-phenyl-aminobenzene (TCVDPA).","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132263905","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 : 2012-12-01DOI: 10.1109/PGC.2012.6458071
Tao Xia, Jiangtao Guo, Xiaobing Li, Xin Mao
A modified demodulation algorithm in the fiber-optic distributed temperature sensing system base on Raman scatter is introduced. It is a combination of wavelet domain denoising and iteration technique which rises the signal to noise ratio(SNR) of the raw data and finely compensate the attenuation difference between Stokes and Anti-Stokes wavelength of the sensing fiber. A 8 km conventional OM1 fiber is used as the temperature sensing fiber and the raw data of demodulated temperature is processed by the wavelet domain denoising method, which enhanced the temperature resolution from 8.0 to 1.0°C in the fiber end, where we got the worst SNR. Further the attenuation difference between the Stokes and Anti-Stokes wavelength is finely compensated by a iteration of 8 times and a temperature resolution of 0.1°C is achieved on a whole fiber of 8 km.
{"title":"A modified demodulation algorithm for fiber-optic distributed temperature sensing system based on raman scattering","authors":"Tao Xia, Jiangtao Guo, Xiaobing Li, Xin Mao","doi":"10.1109/PGC.2012.6458071","DOIUrl":"https://doi.org/10.1109/PGC.2012.6458071","url":null,"abstract":"A modified demodulation algorithm in the fiber-optic distributed temperature sensing system base on Raman scatter is introduced. It is a combination of wavelet domain denoising and iteration technique which rises the signal to noise ratio(SNR) of the raw data and finely compensate the attenuation difference between Stokes and Anti-Stokes wavelength of the sensing fiber. A 8 km conventional OM1 fiber is used as the temperature sensing fiber and the raw data of demodulated temperature is processed by the wavelet domain denoising method, which enhanced the temperature resolution from 8.0 to 1.0°C in the fiber end, where we got the worst SNR. Further the attenuation difference between the Stokes and Anti-Stokes wavelength is finely compensated by a iteration of 8 times and a temperature resolution of 0.1°C is achieved on a whole fiber of 8 km.","PeriodicalId":158783,"journal":{"name":"2012 Photonics Global Conference (PGC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131005296","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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