An investigation of the optical thickness of the aerosol surrounded in the Suvranabhumi airport area using the local constructed sun-photometer is reported. The measurement data obtained are presented comparing to the ones obtained by the standard sun-photometer, where the measurement error of 5 % is obtained. The measurement was implemented within a three months period, starting from November 1th, 2006. The optical thickness obtained of 0.45 is noted, which is described in term of air quality as transparent view. Such effects may be introduced by the airplane fuel waste, infrastructure constructions and industrial estates. Further, the effects of the climate changes and global warming around the investigated area, and wireless communication link degradation are discussed.
{"title":"An aerosol optical thickness investigation in the Suvarnabhumi Airport using an inexpensive sunphotometer","authors":"K. Udomwech, P. Yupapin, S. Pipatsart","doi":"10.1117/12.799427","DOIUrl":"https://doi.org/10.1117/12.799427","url":null,"abstract":"An investigation of the optical thickness of the aerosol surrounded in the Suvranabhumi airport area using the local constructed sun-photometer is reported. The measurement data obtained are presented comparing to the ones obtained by the standard sun-photometer, where the measurement error of 5 % is obtained. The measurement was implemented within a three months period, starting from November 1th, 2006. The optical thickness obtained of 0.45 is noted, which is described in term of air quality as transparent view. Such effects may be introduced by the airplane fuel waste, infrastructure constructions and industrial estates. Further, the effects of the climate changes and global warming around the investigated area, and wireless communication link degradation are discussed.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126305542","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}
An analytical expression is proposed for evaluating the performances of reflection-spectrum envelope for sampled gratings. The accuracy of the expression has been verified by the simulated reflectivity spectrum by use of transfer matrix method. A new technique of multiple reflection-spectrum envelope concatenation is introduced to demonstrate a 23-channel grating with uniform characteristics in all channels. The proposed technology can densify sampled grating both in spectral channel number and in spatially physical corrugation.
{"title":"Application of reflection-spectrum envelope for sampled gratings","authors":"Xiaoying He, D. N. Wang, Dexiu Huang, Yonglin Yu","doi":"10.1117/12.798954","DOIUrl":"https://doi.org/10.1117/12.798954","url":null,"abstract":"An analytical expression is proposed for evaluating the performances of reflection-spectrum envelope for sampled gratings. The accuracy of the expression has been verified by the simulated reflectivity spectrum by use of transfer matrix method. A new technique of multiple reflection-spectrum envelope concatenation is introduced to demonstrate a 23-channel grating with uniform characteristics in all channels. The proposed technology can densify sampled grating both in spectral channel number and in spatially physical corrugation.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114569894","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}
S. Suttirak, P. Buranasiri, P. Banerjee, N. Witthayakorn, W. Neeyakorn
In this work, we present a review of recent works on photorefractive effect in Pb-based relaxor ferroelectric material. The review is based on the well known Kukhtarev's model [1] and recent experimental photorefractive two beam coupling works by He et al [2] and Abe et. al. [3,4]. We also suggest the generation of higher orders and other applications such as optical correlation, phase conjugation, which may be worked well with a Pb-Based relaxor ferroelectric materials. From this work, we have seen the bright future of the research in photorefractive effect using the Pb-based relaxor ferroelectric materials.
{"title":"Photorefractive effect in Pb-based relaxor ferroelectric materials","authors":"S. Suttirak, P. Buranasiri, P. Banerjee, N. Witthayakorn, W. Neeyakorn","doi":"10.1117/12.799538","DOIUrl":"https://doi.org/10.1117/12.799538","url":null,"abstract":"In this work, we present a review of recent works on photorefractive effect in Pb-based relaxor ferroelectric material. The review is based on the well known Kukhtarev's model [1] and recent experimental photorefractive two beam coupling works by He et al [2] and Abe et. al. [3,4]. We also suggest the generation of higher orders and other applications such as optical correlation, phase conjugation, which may be worked well with a Pb-Based relaxor ferroelectric materials. From this work, we have seen the bright future of the research in photorefractive effect using the Pb-based relaxor ferroelectric materials.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123906174","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}
W. Pecharapa, W. Techitheera, P. Thanomgam, J. Nukeaw
The formation of In0.53Ga0.47As/InP single quantum well with narrow well width grown by Organometallic Vapor Phase Epitaxy is verified by photoluminescence spectroscopy. PL spectra exhibit the e(1)-hh(1) transition in the well. PL measurement was conducted at various temperatures from 15K to 200K in order to investigate the important temperature-dependent parameters of this structure. Important parameters such as activation energies responsible for the photoluminescence quenching and broadening mechanisms are achieved. Because of small thermal activation energy of 15.1 meV in the narrow well, carriers can escape from the well to the barrier states. The dependence of PL width on temperature revealed that Inhomogeneous mechanism is the dominant mechanism for the broadening of PL peak and homogeneous mechanism is responsible at high temperature due to electron-phonon interaction.
{"title":"Temperature-dependent photoluminescence investigation of narrow well-width InGaAs/InP single quantum well","authors":"W. Pecharapa, W. Techitheera, P. Thanomgam, J. Nukeaw","doi":"10.1117/12.799254","DOIUrl":"https://doi.org/10.1117/12.799254","url":null,"abstract":"The formation of In0.53Ga0.47As/InP single quantum well with narrow well width grown by Organometallic Vapor Phase Epitaxy is verified by photoluminescence spectroscopy. PL spectra exhibit the e(1)-hh(1) transition in the well. PL measurement was conducted at various temperatures from 15K to 200K in order to investigate the important temperature-dependent parameters of this structure. Important parameters such as activation energies responsible for the photoluminescence quenching and broadening mechanisms are achieved. Because of small thermal activation energy of 15.1 meV in the narrow well, carriers can escape from the well to the barrier states. The dependence of PL width on temperature revealed that Inhomogeneous mechanism is the dominant mechanism for the broadening of PL peak and homogeneous mechanism is responsible at high temperature due to electron-phonon interaction.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121483802","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}
Fiber couplers are widely used in telecommunication and industry as a passive splitting power device. The effective power coupling and transmitting from one fiber to another is mainly determined by both coupling length and coupling coefficient. Coupling length can be calculated directly but for coupling coefficient it depends upon the refractive index and separation fiber axis. After fusion processes of two SMF-28e(R) couplers, the refractive index is unknown due to change in the radius of fiber (rcladd<40μm and rcore<1.5μm). Coupling coefficient range is obtained from a distribution of coupling ratio and compared with the empirical formula which also enables to calculate refractive index. In this experiment, coupling coefficient in the range of 0.6-0.9/mm is calculated as a function of separation fiber axis and refractive index of core and cladding. The result shows a good correlation between experimental results and theoretical calculation.
{"title":"Estimation of coupling power parameter of fused coupled fibers","authors":".. Saktioto, J. Ali, M. Fadhali, J. Zainal","doi":"10.1117/12.798955","DOIUrl":"https://doi.org/10.1117/12.798955","url":null,"abstract":"Fiber couplers are widely used in telecommunication and industry as a passive splitting power device. The effective power coupling and transmitting from one fiber to another is mainly determined by both coupling length and coupling coefficient. Coupling length can be calculated directly but for coupling coefficient it depends upon the refractive index and separation fiber axis. After fusion processes of two SMF-28e(R) couplers, the refractive index is unknown due to change in the radius of fiber (rcladd<40μm and rcore<1.5μm). Coupling coefficient range is obtained from a distribution of coupling ratio and compared with the empirical formula which also enables to calculate refractive index. In this experiment, coupling coefficient in the range of 0.6-0.9/mm is calculated as a function of separation fiber axis and refractive index of core and cladding. The result shows a good correlation between experimental results and theoretical calculation.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134089632","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}
In this paper, we present an experimental investigation of all-optical switch using a symmetric Mach-Zehnder interferometer (MZI) combined with double fiber ring resonators. Here, we replace the ordinary-fiber ring resonator on one arm of MZI by a 980 nm-laser pumped erbium-doped fiber (EDF) ring resonator to form an EDFA. When adjusting the EDF pump power up we note increasing in switching power. Experimental results indicate that using MZI with double EDF ring, switching power is lowered significantly to nanowatt level in comparison with that of MZI with a single EDF ring of milliwatt level.
{"title":"An alternative optical switch using Mach Zehnder interferometer and two ring resonators","authors":"P. Yupapin, P. Saeung, P. Chunpang","doi":"10.1117/12.799429","DOIUrl":"https://doi.org/10.1117/12.799429","url":null,"abstract":"In this paper, we present an experimental investigation of all-optical switch using a symmetric Mach-Zehnder interferometer (MZI) combined with double fiber ring resonators. Here, we replace the ordinary-fiber ring resonator on one arm of MZI by a 980 nm-laser pumped erbium-doped fiber (EDF) ring resonator to form an EDFA. When adjusting the EDF pump power up we note increasing in switching power. Experimental results indicate that using MZI with double EDF ring, switching power is lowered significantly to nanowatt level in comparison with that of MZI with a single EDF ring of milliwatt level.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133461839","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}
We propose a design of a tunable band-pass filtering device using an optical micro ring resonator. Such a device can be used to generate the required filtering signals in the optical communication transmission line. In principle, the chaotic signals are generated by a Kerr effects nonlinear type via a micro ring resonator. The input power can be used to control the specific filtering signals. The required information can be retrieved from the chaotic signals by using the specific filter, i.e. the specified users. The ring parameters used with the ring radii are ranged between 10-20 μm and n2 = 2.2 x 10-15 m2/W. The simulation results obtained have shown the potential of using such a proposed device as tunable band-pass or band-stop filters, which can be used to form the information security.
{"title":"An optical tunable band-pass filter using chaotic signals in a nonlinear micro-ring resonator","authors":"P. Yupapin, W. Suwancharoen, S. Pipatsart","doi":"10.1117/12.799426","DOIUrl":"https://doi.org/10.1117/12.799426","url":null,"abstract":"We propose a design of a tunable band-pass filtering device using an optical micro ring resonator. Such a device can be used to generate the required filtering signals in the optical communication transmission line. In principle, the chaotic signals are generated by a Kerr effects nonlinear type via a micro ring resonator. The input power can be used to control the specific filtering signals. The required information can be retrieved from the chaotic signals by using the specific filter, i.e. the specified users. The ring parameters used with the ring radii are ranged between 10-20 μm and n2 = 2.2 x 10-15 m2/W. The simulation results obtained have shown the potential of using such a proposed device as tunable band-pass or band-stop filters, which can be used to form the information security.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128467403","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}
The ground state transition energy as various temperatures of a single quantum well structure has been calculated. The numerical technique called shooting method was developed to get eigen values and eigen functions. Passler's model and Aspnes's equation are adopted to calculate the energy gap (Eg) of Al0.3Ga0.7As and GaAs respectively. Our calculation has been tested by comparing the results to PL experimental data of Al0.3Ga0.7As / GaAs single quantum well. Good agreement has been found in the low temperature range (less than 40 K) and fair result has been obtained in the range of temperature higher than 40 K.
{"title":"Shooting method calculation of temperature dependence of transition energy for quantum well structure","authors":"Bunjong Jukgoljun, W. Pecharapa, W. Techitdheera","doi":"10.1117/12.799424","DOIUrl":"https://doi.org/10.1117/12.799424","url":null,"abstract":"The ground state transition energy as various temperatures of a single quantum well structure has been calculated. The numerical technique called shooting method was developed to get eigen values and eigen functions. Passler's model and Aspnes's equation are adopted to calculate the energy gap (Eg) of Al0.3Ga0.7As and GaAs respectively. Our calculation has been tested by comparing the results to PL experimental data of Al0.3Ga0.7As / GaAs single quantum well. Good agreement has been found in the low temperature range (less than 40 K) and fair result has been obtained in the range of temperature higher than 40 K.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"230 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130955391","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}
P. Yupapin, W. Suwancharoen, S. Chaiyasoonthorn, S. Thongmee
This paper proposes a system of signal security using the optic series waveguide micro ring resonator, where the chaotic noise generation and cancellation can be performed. The required communication signals can be multiplexed with the generated chaotic noise in a micro ring resonator before transmission. The required information can be recovered via optic series waveguide micro ring resonator by a specific user at the output port of the waveguide micro-ring resonator. Simulation results obtained have shown the potential of applications which is closed to the practical applications, especially, The required information can be retrieved by the specified users. The ring parameters used with the ring radii are ranged between 10-20 μm, κ1 = κ2 = 0.0225 and n2 = 2.2 × 10-15 m2/W. The simulation results obtained have shown the potential of using such a proposed device for tunable band-pass and band-stop filters, which can be used for the information security in the system by the optic series waveguide micro ring resonator.
{"title":"Chaotic signal filtering device using a serial connection of micro-ring resonators","authors":"P. Yupapin, W. Suwancharoen, S. Chaiyasoonthorn, S. Thongmee","doi":"10.1117/12.799530","DOIUrl":"https://doi.org/10.1117/12.799530","url":null,"abstract":"This paper proposes a system of signal security using the optic series waveguide micro ring resonator, where the chaotic noise generation and cancellation can be performed. The required communication signals can be multiplexed with the generated chaotic noise in a micro ring resonator before transmission. The required information can be recovered via optic series waveguide micro ring resonator by a specific user at the output port of the waveguide micro-ring resonator. Simulation results obtained have shown the potential of applications which is closed to the practical applications, especially, The required information can be retrieved by the specified users. The ring parameters used with the ring radii are ranged between 10-20 μm, κ1 = κ2 = 0.0225 and n2 = 2.2 × 10-15 m2/W. The simulation results obtained have shown the potential of using such a proposed device for tunable band-pass and band-stop filters, which can be used for the information security in the system by the optic series waveguide micro ring resonator.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125244441","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}
We propose a new digital method for tracking position of particles from in-line holograms by using single wavelet coefficient. By computing a wavelet transform of the 1-D intensity profile of a hologram, resultant wavelet coefficients provide space-varying frequency information of an interference pattern. Our study finds that a dilation which is given by the maximum value of the real wavelet coefficient appeared at the center position of the interference pattern is determined by a recording distance and a wavelength of a coherent illuminating light. Therefore, this dilation can be used for extracting the recording distance of particles from the holograms. A feasibility of this method is experimentally verified by analyzing holograms of a line object.
{"title":"Particle tracking from in-line holograms by using single wavelet coefficient","authors":"S. Soontaranon, J. Widjaja","doi":"10.1117/12.798951","DOIUrl":"https://doi.org/10.1117/12.798951","url":null,"abstract":"We propose a new digital method for tracking position of particles from in-line holograms by using single wavelet coefficient. By computing a wavelet transform of the 1-D intensity profile of a hologram, resultant wavelet coefficients provide space-varying frequency information of an interference pattern. Our study finds that a dilation which is given by the maximum value of the real wavelet coefficient appeared at the center position of the interference pattern is determined by a recording distance and a wavelength of a coherent illuminating light. Therefore, this dilation can be used for extracting the recording distance of particles from the holograms. A feasibility of this method is experimentally verified by analyzing holograms of a line object.","PeriodicalId":426962,"journal":{"name":"International Workshop and Conference on Photonics and Nanotechnology","volume":"6793 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131115757","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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