Pub Date : 2011-04-24DOI: 10.1109/SIECPC.2011.5876906
B. F. Alsubaie, M. BenSaleh, A. Alatawi, Liang He, X. Kou, Xinxin Yu, Kang L. Wang, Guan-Feng Huang, F. Xiu
We demonstrate selectively-grown GaAs nano/micro structures on silicon substrates by molecular beam epitaxy. Hexagonal or rectangular shaped GaAs crystals, depending on the orientation of the silicon substrate, were formed inside the silicon-dioxide-masked nanoholes at 630°C. Clear facets, which are the low-energy {011} planes, indicate single-crystalline nature of the growth. GaAs/InAs/GaAs structure was also realized and strong photoluminescence spectra at 1200nm were observed at 80K.
{"title":"Selectively-grown III-V compound semiconductor nano/micro structures on silicon for optoelectronics applications","authors":"B. F. Alsubaie, M. BenSaleh, A. Alatawi, Liang He, X. Kou, Xinxin Yu, Kang L. Wang, Guan-Feng Huang, F. Xiu","doi":"10.1109/SIECPC.2011.5876906","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876906","url":null,"abstract":"We demonstrate selectively-grown GaAs nano/micro structures on silicon substrates by molecular beam epitaxy. Hexagonal or rectangular shaped GaAs crystals, depending on the orientation of the silicon substrate, were formed inside the silicon-dioxide-masked nanoholes at 630°C. Clear facets, which are the low-energy {011} planes, indicate single-crystalline nature of the growth. GaAs/InAs/GaAs structure was also realized and strong photoluminescence spectra at 1200nm were observed at 80K.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130218148","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876965
A. H. Morshed
Multimode interference in optical waveguides has interesting self-imaging properties, which have extensively been investigated and utilized in many integrated optical devices. Although these investigations started with most interest in step-index integrated waveguides, they have later included graded-index waveguides, where the dependence of the interference images on the refractive index grading of the waveguides was observed and utilized in the design and optimization of devices. Later on, multimode interference has also been explored in optical fibers in order to realize fiber devices, including sensors. A basic structure of these devices has been the Single mode — Multimode — Single mode (SMS) fiber section concatenation, where multimode interference in the multimode section leads to the formation of a self-image of the single mode fiber excitation onto the output single mode fiber core. This paper reports on the investigation of the self-imaging properties of these optical fiber structures and their possible use as sensors. Self-imaging in symmetrically excited multimode optical fibers is analytically studied, revealing the effect of refractive index grading on the characteristics of SMS fiber devices. The theoretical results are verified by numerical simulations using the beam propagation method. The experimental investigation of an SMS structure proposed as a bending sensor is then described and a discussion of the results obtained and possible application of the device is presented.
{"title":"Self-imaging in single mode-multimode-single mode optical fiber sensors","authors":"A. H. Morshed","doi":"10.1109/SIECPC.2011.5876965","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876965","url":null,"abstract":"Multimode interference in optical waveguides has interesting self-imaging properties, which have extensively been investigated and utilized in many integrated optical devices. Although these investigations started with most interest in step-index integrated waveguides, they have later included graded-index waveguides, where the dependence of the interference images on the refractive index grading of the waveguides was observed and utilized in the design and optimization of devices. Later on, multimode interference has also been explored in optical fibers in order to realize fiber devices, including sensors. A basic structure of these devices has been the Single mode — Multimode — Single mode (SMS) fiber section concatenation, where multimode interference in the multimode section leads to the formation of a self-image of the single mode fiber excitation onto the output single mode fiber core. This paper reports on the investigation of the self-imaging properties of these optical fiber structures and their possible use as sensors. Self-imaging in symmetrically excited multimode optical fibers is analytically studied, revealing the effect of refractive index grading on the characteristics of SMS fiber devices. The theoretical results are verified by numerical simulations using the beam propagation method. The experimental investigation of an SMS structure proposed as a bending sensor is then described and a discussion of the results obtained and possible application of the device is presented.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130474926","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876902
M. Akhtar, N. Yahya, Nadeem Nasir
Sea bed logging (SBL) is a new method for detection of hydrocarbon reservoir beneath the seabed. A powerful electromagnetic (EM) antenna having strong EM waves is required for the transmission of EM signal underneath the seabed for deep target exploration which is still remains a challenge. A new aluminium transmitter with yttrium iron garnet (Y3Fe5O12) based magnetic feeders was developed in a scale tank to increase the magnitude of the magnetic field. Y3Fe5O12 were prepared by using Modified Conventional Mixing Oxide (MCMO) technique. The samples were sintered at 750°C, 950°C, 1150°C and 1350°C to get required characteristics of garnet nanoparticles. Characterizations of Y3Fe5O12 were done by using XRD, RAMAN, FESEM and Impedance network analyzer. X-ray diffraction results revealed that best Y3Fe5O12 phase was appeared at the sintering temperature of 1350°C. Nanoparticles sizes ranging from 60 to 100nm were obtained by using MCMO method. Raman results also demonstrate the confirmation of garnet structure of Y3Fe5O12 sample at 1350°C. Field emission scanning electron microscopy (FESEM) was used to see the morphology of the Y3Fe5O12 nanoparticles. Magnetic characterization results showed that Y3Fe5O12 at 1350°C has high Initial permeability (30.8773) and high Q-factor (45.719), where as low loss factor (0.0001) was also investigated. Samples having high Q factor were chosen for EM antenna. Simulations of new EM antenna were done by using CST software. It was observed that magnitude of this EM waves were increased up to 166% in scale tank using novel EM antenna. It was also found from the results of Finite element (FE) modelling of the scaled tank that the magnitude of B field increased by using Y3Fe5O12 magnetic feeders on EM antenna.
{"title":"Novel EM antenna based on Y3Fe5O12 magnetic feeders for improved MVO","authors":"M. Akhtar, N. Yahya, Nadeem Nasir","doi":"10.1109/SIECPC.2011.5876902","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876902","url":null,"abstract":"Sea bed logging (SBL) is a new method for detection of hydrocarbon reservoir beneath the seabed. A powerful electromagnetic (EM) antenna having strong EM waves is required for the transmission of EM signal underneath the seabed for deep target exploration which is still remains a challenge. A new aluminium transmitter with yttrium iron garnet (Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf>) based magnetic feeders was developed in a scale tank to increase the magnitude of the magnetic field. Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> were prepared by using Modified Conventional Mixing Oxide (MCMO) technique. The samples were sintered at 750°C, 950°C, 1150°C and 1350°C to get required characteristics of garnet nanoparticles. Characterizations of Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> were done by using XRD, RAMAN, FESEM and Impedance network analyzer. X-ray diffraction results revealed that best Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> phase was appeared at the sintering temperature of 1350°C. Nanoparticles sizes ranging from 60 to 100nm were obtained by using MCMO method. Raman results also demonstrate the confirmation of garnet structure of Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> sample at 1350°C. Field emission scanning electron microscopy (FESEM) was used to see the morphology of the Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> nanoparticles. Magnetic characterization results showed that Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> at 1350°C has high Initial permeability (30.8773) and high Q-factor (45.719), where as low loss factor (0.0001) was also investigated. Samples having high Q factor were chosen for EM antenna. Simulations of new EM antenna were done by using CST software. It was observed that magnitude of this EM waves were increased up to 166% in scale tank using novel EM antenna. It was also found from the results of Finite element (FE) modelling of the scaled tank that the magnitude of B field increased by using Y<inf>3</inf>Fe<inf>5</inf>O<inf>12</inf> magnetic feeders on EM antenna.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121165305","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876690
I. L. Abdel-Hafez, Y. Khalaf, F. Farag
A large dynamic range Programmable Variable Gain Amplifier (PVGA) suitable for Ultra Wide Band (UWB) applications is presented. The PVGA is composed of three variable gain amplifier stages followed by an output buffer. Such wide bandwidth allows our proposed PVGA to be used in multi-standard protocols. Power reduction is developed for the variable gain amplifier stages. The PVGA circuit is designed and simulated in a 0.13 um IBM-CMOS technology; it consumes 21 mA from a 1.5 V supply. The PVGA achieves 46 dB maximum gain with 48 dB gain dynamic range, a −43 dB THD at peak-to-peak differential output voltage of 800 mV and frequency 400 MHz. Moreover; the proposed circuit reports a good noise performance; the average integrated noise is 141 nV/vHz at minimum gain of −2 dB.
{"title":"Design of Wide Band PVGA for UWB applications","authors":"I. L. Abdel-Hafez, Y. Khalaf, F. Farag","doi":"10.1109/SIECPC.2011.5876690","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876690","url":null,"abstract":"A large dynamic range Programmable Variable Gain Amplifier (PVGA) suitable for Ultra Wide Band (UWB) applications is presented. The PVGA is composed of three variable gain amplifier stages followed by an output buffer. Such wide bandwidth allows our proposed PVGA to be used in multi-standard protocols. Power reduction is developed for the variable gain amplifier stages. The PVGA circuit is designed and simulated in a 0.13 um IBM-CMOS technology; it consumes 21 mA from a 1.5 V supply. The PVGA achieves 46 dB maximum gain with 48 dB gain dynamic range, a −43 dB THD at peak-to-peak differential output voltage of 800 mV and frequency 400 MHz. Moreover; the proposed circuit reports a good noise performance; the average integrated noise is 141 nV/vHz at minimum gain of −2 dB.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124343706","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876911
Bacha Rehman, Taimur Qureshi
After several years of research in English and other European languages for interface designing both in desktop and web applications, it has also become a popular domain of research in Urdu language. Unfortunately languages like Urdu have gained a reduced amount of consideration in this regard. In this paper we present a technique for designing an interface initially for desktop application e.g databases. We use ASCII codes for mapping the keystrokes to the Urdu character's images using the well known Phonetic keyboard styles. Initially we create three fonts (e.g CheeChest, MUM1, NooriNastaliq33) for this purpose, and the Urdu characters contained in these fonts are mapped through ASCII codes. On the other hand characters can be mapped to any type of desktop application control (e.g textbox, combo box etc.) for writing Urdu words and further can get access to any database. Since all these activities are performed in runtime, the database stores the characters in original English language in back end. The paper is based on the main and ever-demanded requirement of software furnished with Urdu interface. This paper also presents a literature with new goal that researchers can look these techniques for further development using more advance techniques.
{"title":"Urdu as interface design language — A novel approach","authors":"Bacha Rehman, Taimur Qureshi","doi":"10.1109/SIECPC.2011.5876911","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876911","url":null,"abstract":"After several years of research in English and other European languages for interface designing both in desktop and web applications, it has also become a popular domain of research in Urdu language. Unfortunately languages like Urdu have gained a reduced amount of consideration in this regard. In this paper we present a technique for designing an interface initially for desktop application e.g databases. We use ASCII codes for mapping the keystrokes to the Urdu character's images using the well known Phonetic keyboard styles. Initially we create three fonts (e.g CheeChest, MUM1, NooriNastaliq33) for this purpose, and the Urdu characters contained in these fonts are mapped through ASCII codes. On the other hand characters can be mapped to any type of desktop application control (e.g textbox, combo box etc.) for writing Urdu words and further can get access to any database. Since all these activities are performed in runtime, the database stores the characters in original English language in back end. The paper is based on the main and ever-demanded requirement of software furnished with Urdu interface. This paper also presents a literature with new goal that researchers can look these techniques for further development using more advance techniques.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121396544","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876889
Z. Aziz, Y. Sefir, R. Djelti, S. Bentata
In this study, we have numerically examined the effect of applied bias on the transmission across Dimer Fibonacci Height Barrier Superlattices (DFHBSL) by using the exact airy function formalism and the transfer matrix technique. We have observed the formation of miniband structure and disappearance of the singularly localised states in the Structure of Dimer Fibonacci in height barrier superlattices (DFHBSL), Its due to the interaction between the states of the dimer wells inside the potential, the electron sees the system like two structure ordered imbricate one in the other, therefore, one tends more towards the order than the disorder related to the structure of Fibonacci.
{"title":"Modelisation and simulation of the transmission properties in Dimer Fibonacci Superlattices","authors":"Z. Aziz, Y. Sefir, R. Djelti, S. Bentata","doi":"10.1109/SIECPC.2011.5876889","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876889","url":null,"abstract":"In this study, we have numerically examined the effect of applied bias on the transmission across Dimer Fibonacci Height Barrier Superlattices (DFHBSL) by using the exact airy function formalism and the transfer matrix technique. We have observed the formation of miniband structure and disappearance of the singularly localised states in the Structure of Dimer Fibonacci in height barrier superlattices (DFHBSL), Its due to the interaction between the states of the dimer wells inside the potential, the electron sees the system like two structure ordered imbricate one in the other, therefore, one tends more towards the order than the disorder related to the structure of Fibonacci.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121666724","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876985
S. Bentata
We study the nature of the electronic states in one-dimensional disordered superlattices. We examine analytically and numerically the effects of short-range correlated disorder in Random Dimer Barrier Superlattices (RDBSL)[1–4]. The conductance and the localization length are statistically computed within an average procedure by means transfer matrix formalism to discriminate the nature of the electronic states in the miniband structure. We consider AlxGa1−xAs layers having identical thickness where the (Al) molar fraction x takes at random two different values with the constraint that one of them appears only in pairs, thus forming a RDBSL. We demonstrate that the superlattice supports two types of delocalized states; one of them comes from resonance effects at dimer barriers, while the other type is due to the commuting nature of the transfer matrices describing the system at certain energies. The states close to the resonance can be viewed as consisting of extended states. In the band tails, i.e. for vanishing conductance, the states are strongly localized.
{"title":"Nature of the electronic states in random dimer AlxGa1−xAs superlattices","authors":"S. Bentata","doi":"10.1109/SIECPC.2011.5876985","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876985","url":null,"abstract":"We study the nature of the electronic states in one-dimensional disordered superlattices. We examine analytically and numerically the effects of short-range correlated disorder in Random Dimer Barrier Superlattices (RDBSL)[1–4]. The conductance and the localization length are statistically computed within an average procedure by means transfer matrix formalism to discriminate the nature of the electronic states in the miniband structure. We consider AlxGa1−xAs layers having identical thickness where the (Al) molar fraction x takes at random two different values with the constraint that one of them appears only in pairs, thus forming a RDBSL. We demonstrate that the superlattice supports two types of delocalized states; one of them comes from resonance effects at dimer barriers, while the other type is due to the commuting nature of the transfer matrices describing the system at certain energies. The states close to the resonance can be viewed as consisting of extended states. In the band tails, i.e. for vanishing conductance, the states are strongly localized.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123305259","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876921
A. Abobaker, S. Olupitan, S. S. Aphale, K. Nakkeeran, K. Senthilnathan, P. R. Babu
We consider the optical pulse propagation in a tapered photonic crystal fiber (PCF) wherein dispersion as well as nonlinearity varies along the propagation direction. The generalized nonlinear Schrödinger equation aptly models the pulse propagation in such a PCF. The design of the tapered PCF is based on the analytical results which demand that the dispersion decrease exponentially and the nonlinearity increase exponentially. By employing the self-similar scaling analysis, we have already proposed the efficient pulse compression scheme with the chirped soliton. In order to get more insight into the dynamics of the pulses (the variations in the amplitude, pulse width and chirp) while being compressed, we adopt the generalized projection operator method (POM) which, in turn, helps arrive at two different sets of pulse parameter equations of Lagrangian variation method (LVM) and collective variable method (CVM).
{"title":"Dynamics of 850 nm optical pulses upon compression in a tapered photonic crystal fiber","authors":"A. Abobaker, S. Olupitan, S. S. Aphale, K. Nakkeeran, K. Senthilnathan, P. R. Babu","doi":"10.1109/SIECPC.2011.5876921","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876921","url":null,"abstract":"We consider the optical pulse propagation in a tapered photonic crystal fiber (PCF) wherein dispersion as well as nonlinearity varies along the propagation direction. The generalized nonlinear Schrödinger equation aptly models the pulse propagation in such a PCF. The design of the tapered PCF is based on the analytical results which demand that the dispersion decrease exponentially and the nonlinearity increase exponentially. By employing the self-similar scaling analysis, we have already proposed the efficient pulse compression scheme with the chirped soliton. In order to get more insight into the dynamics of the pulses (the variations in the amplitude, pulse width and chirp) while being compressed, we adopt the generalized projection operator method (POM) which, in turn, helps arrive at two different sets of pulse parameter equations of Lagrangian variation method (LVM) and collective variable method (CVM).","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115531300","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876987
H. Al-shamiri, Y. Badr, M. Kana
The lasing action of some dyes (pyrromethene 597, pyrromethene 567 and Rhodamin B) incorporated into sol-gel silica glass material were reported. The amplified spontaneous emission (ASE) was studied under 532 nm, laser excitation in transverse pumping configuration for the prepared rod samples. The influence of dye concentrations on the amplified spontaneous emission peak wavelengths, the output energies, the gain and the energy conversion efficiencies were studied. Relatively high efficiencies were obtained with good photostabilities where a decrease to ∼ 40% of the initial ASE output energy were observed after pumping by ∼ 60,000 shots at relatively high repetition rate (10 Hz) and energy (15 mJ).
{"title":"Optical, photo-physical properties and photostability of laser dyes impregnated in sol-gel matrix","authors":"H. Al-shamiri, Y. Badr, M. Kana","doi":"10.1109/SIECPC.2011.5876987","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876987","url":null,"abstract":"The lasing action of some dyes (pyrromethene 597, pyrromethene 567 and Rhodamin B) incorporated into sol-gel silica glass material were reported. The amplified spontaneous emission (ASE) was studied under 532 nm, laser excitation in transverse pumping configuration for the prepared rod samples. The influence of dye concentrations on the amplified spontaneous emission peak wavelengths, the output energies, the gain and the energy conversion efficiencies were studied. Relatively high efficiencies were obtained with good photostabilities where a decrease to ∼ 40% of the initial ASE output energy were observed after pumping by ∼ 60,000 shots at relatively high repetition rate (10 Hz) and energy (15 mJ).","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"31 17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115794640","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 : 2011-04-24DOI: 10.1109/SIECPC.2011.5876944
A. García-Ortiz, Daniel Gregorek, Christof Osewold
The selection of the right low-power coding technique during the design of the interconnect architecture has a high potential. However, it requires the analysis and evaluation to be performed at high-levels of abstraction. Closed formulas to quantify the power reduction achieved by each low-power code are therefore highly desirable. Using a simplified Dual Bit Type model for the underlying signals, the current work provides closed formulas for calculating the transition activity of correlated DSP signals encoded with the Bus-Invert technique. It considers the effect of the temporal and spatial correlation present in typical DSP signals. The accuracy of the proposed formulas is validated with extensive simulations at the bit level.
{"title":"Analysis of Bus-Invert coding in the presence of correlations","authors":"A. García-Ortiz, Daniel Gregorek, Christof Osewold","doi":"10.1109/SIECPC.2011.5876944","DOIUrl":"https://doi.org/10.1109/SIECPC.2011.5876944","url":null,"abstract":"The selection of the right low-power coding technique during the design of the interconnect architecture has a high potential. However, it requires the analysis and evaluation to be performed at high-levels of abstraction. Closed formulas to quantify the power reduction achieved by each low-power code are therefore highly desirable. Using a simplified Dual Bit Type model for the underlying signals, the current work provides closed formulas for calculating the transition activity of correlated DSP signals encoded with the Bus-Invert technique. It considers the effect of the temporal and spatial correlation present in typical DSP signals. The accuracy of the proposed formulas is validated with extensive simulations at the bit level.","PeriodicalId":125634,"journal":{"name":"2011 Saudi International Electronics, Communications and Photonics Conference (SIECPC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114466245","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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