2010 Symposium on Photonics and Optoelectronics最新文献

{"title":"Research on FSO Blind Equalization Algorithm of Decision-Directed Based on Higher-Order Cumulant","authors":"Xizheng Ke, Hua He, Ni Wang","doi":"10.1109/SOPO.2010.5504130","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504130","url":null,"abstract":"The transmission of laser in atmosphere is affected by kinds of factors in atmosphere channel, which brings signal attenuation and inter-symbol interferences. This paper proposes blind equalization algorithm of decision-directed based on higher-order cumulant to solve these problems. Take third-order cumulant as example, some simulations of the algorithm are made under different weather conditions. The simulation results show that the effect of blind blind equalization algorithm of decision-directed based on higher-order cumulant is better than that of classical adjudging and inducing method, which having quick convergency in addition gives advantage to improve signal attenuation and inter-symbol interferences in atmosphere laser communication system.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130925830","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}

{"title":"Fabrication of PCSS Based on AFM and Photolithograph","authors":"Qinggang Liu, Kai Zhang, Jindong Xin, Xiaotang Hu","doi":"10.1109/SOPO.2010.5504010","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504010","url":null,"abstract":"Several ten nanometers width TiOx wires was fabricated on the surface of 3~5nm thick Ti lines which covers GaAs substrate. TiOx wires are fabricated by atomic force microscope (AFM), and the Ti lines are fabricated by photolithograph method. Oxide is used as insulator/energy barrier between the electrodes to substitute the air gap of traditional type photoconductive semiconductive switches (PCSS). The electrodes and substrate's materials are Ti-Au and LT-GaAs respectively. The simulation result indicated that the voltage or current output characteristic of the PCSS is different from the traditional switch. In this paper, this phenomenon is analyzed and the method to avoid such kind of non-linearity output is discussed.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133075390","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}

{"title":"Design on Hybrid Diffractive and Refractive Long-Focal Objective","authors":"Xuhua Zhai, Hong-tao Zhang, Fenghua Zou","doi":"10.1109/SOPO.2010.5504355","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504355","url":null,"abstract":"Diffractive optical elements (DOE) have the special property of minus dispersion which can be used in the optical system instead of lens to improve its performance, lighten its weight, and reduce its volume effectively. Based on a conventional refractive long-length objective, a lightweight Hybrid Diffractive - Refractive (HDR) long-length objective was designed with the CODE V software. The optical parameters of the system were that focal length was 100 mm, full field-of-view was 6.2°,diameter is 20mm.，and its wavelength range is from 486.1 mm to 656.27 mm. The surface profile parameter of the diffractive optical element was calculated accurately. The mean MTF approached to 0.6 at the frequency of 50lp/mm. The aberration characteristics of the conventional refractive and the designed HRD optical system were compared such as spot diagram, MTF curve, distortion and field curvature. The results show that the image quality of the HDR system is significantly improved, and can meet the demands at the situation with high accuracy.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133395802","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}

{"title":"Unsteady Simulation of HYLTE Nozzle Flowfields with Supersonic Angled Injection","authors":"Y. Shao, Jin Zhou, Haiyan Wu, L. Lai, J. Lei","doi":"10.1109/SOPO.2010.5504280","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504280","url":null,"abstract":"Three-dimensional, unsteady Navier-Stokes equations have been solved to calculate the mixing between secondary injections at three different injection angles interact with the supersonic primary flow within the Hypersonic Low Temperature (HYLTE) nozzle. Results show that contact surface strentching and streamwise vortices especially counter vortex pairs (CVP) dominate and accelerate mixing. And the angle of injection is the key parameter to affect the mixing characteristics. Optimum incident angle and nozzle performance have to be found for engineering applications.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133302817","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}

{"title":"Analysis and Design of a New Type Polymer Modulator Based on Asymmetric Mach-Zehnder Structure","authors":"Y. Wen, Xiao-xia Zhang, Hua-dong Liu, Sizhan Liu","doi":"10.1109/SOPO.2010.5504422","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504422","url":null,"abstract":"An asymmetric path ridge waveguide for an organic polymer Mach-Zehnder modulator was designed to make the initial phase difference between the two arms be π/2. The mode characteristic is analyzed and the ridge waveguide is designed with effective index method (EIM). Optical field distribution has been simulated by Beam Propagation Method (BPM). Aiming at a smaller conductor loss and better impedance match, the structural parameters of electrode are also optimized. Combining with the parameters of the ridge waveguide and the electrode, velocities match between lightwave and microwave can be achieved. We showed that the thickness of the additional layer on the electrode must be taken into account because there is a significant change in the characteristic impedance. For our design, the estimated bandwidth of the asymmetric Mach- Zehnder modulator is over 150GHz.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132584746","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}

{"title":"Simultaneous Strain/Temperature Measurement with Fiber Bragg Grating and High-Birefringence Fiber Loop Mirrors Using an Intensity-Based Interrogation Method","authors":"Dapeng Zhou, W. Liu, Li Wei","doi":"10.1109/SOPO.2010.5504049","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504049","url":null,"abstract":"A novel all-fiber sensor which can measure temperature and strain simultaneously is presented. The sensor scheme is formed by a fiber Bragg grating and two high-birefringence fiber loop mirrors (HBFLMs). Both HBFLMs act as interrogators with one of them also dependent on both temperature and strain. By monitoring the optical power changes, it is feasible to obtain information that permits simultaneous measurement of temperature and strain.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132588074","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}

{"title":"A Q-Switched 980 nm Yb-Doped Single-Mode Fiber Amplifier and Its Frequency Doubling","authors":"Pingxue Li, Xuexia Zhang, S. Zou, Z. Bai, Gang Li","doi":"10.1109/SOPO.2010.5504265","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504265","url":null,"abstract":"In this paper, a single-mode Q-switched 980 nm Yb-doped fiber amplifier were studied experimentally. In the experiment, we used a 980 nm acousto-optics (AO) Q-switched Yb-doped single-mode fiber laser as the seed source, which generated an average output power of 73 mW at 980 nm with the pulse width of 10 ns at repetition frequency of 16 kHz. Then, another single-mode Yb-doped fiber pumped by a cw 946 nm Nd:YAG laser composed the fiber amplifier. As a result, the 980 nm amplified light with 150 mW average output power was generated. Through frequency doubling the 980 nm laser with a BIBO crystal, an average output power of 8 mW of pulsed blue-green laser at 490 nm was generated.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"594 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132713565","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}

{"title":"Luminescent Properties of Ba3MgSi2-XAlxO8: Eu²+, Mn²+ Phosphor for White LED","authors":"Changyu Shen, Ke Li, Qianglong Hou, Shangzhong Jin","doi":"10.1109/SOPO.2010.5504416","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504416","url":null,"abstract":"Series of Ba3MgSi2-xAlxO8: Eu2+, Mn2+ phosphors were synthesized by solid-state reaction and X-ray powder diffraction analysis confirmed the formation of the samples. These phosphors have a broad excitation band range from near ultraviolet to blue region (340-460nm). The phosphors have three emission bands peaking at 615nm, 480nm and 420 nm respectively under excitation of 380nm irradiation. Two emissions peaking at 420nm and 480nm originated from the 5d to 4f transition of Eu2+ ions that occupy two Ba2+ sites in the crystal of Ba3MgSi2-xAlxO8. The 615nm emission is attributed to the energy transferring from Eu2+ to Mn2+. The intensity ratio between the 420nm and 480nm emissions varied with different concentration of Al ions. When the concentrations of the Eu2+, Mn2+ and Al3+ were 0.1mol, 0.1mol and 0.35mol in the phosphor respectively, the phosphor presented intense white emitting under the excitation of 380nm irradiation. The GaN (380nm)-based Ba2.9Mg0.9Si1.65Al0.35O8:0.1Eu2+ 0.1Mn2+ white LED with the CIE coordinate of (0.3085，0.3139) and color rendering of over 85 was obtained.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"07 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131319872","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}

{"title":"Non-Destructive Determination of the Quality Components in Fresh Pork Meat Using near Diffuse Reflectance Spectroscopy","authors":"B. Cai, Huacai Chen, Yongjun Zhang, Jia-xing Jiang","doi":"10.1109/SOPO.2010.5504432","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504432","url":null,"abstract":"Two kinds of sampling methods of optics integrating sphere diffuse reflectance chamber and optical fiber diffuse reflectance probe were employed to collect the near-infrared spectra of 72 fresh lean pork meat samples, respectively. The amount of fat, protein and water in pork meat were determined by the national standard analysis methods as reference. The quantitative analysis models of the above constituents in pork meat were developed by using partial least squares (PLS) regression with internal cross-validation and optimized through spectra pretreatment and spectra region selection. The correlation coefficients (R2) of the calibration models of fat, protein and water based on integrating sphere diffuse reflectance were 90.24%, 91.95% and 90.15%, respectively. And the values of RMSECV of these models were 0.377%, 0.011% and 0.323%, respectively. For the models on optical fiber bundle diffuse reflectance spectra, the values of R2 were 83.68%, 87.97% and 83.27% respectively, the values of RMSECV were 0.321%, 0.0099% and 0.277%, respectively. The calibration models were further validated by the prediction sample sets. The prediction mean square error (RMSEP) of the three constituents were 0.254%, 0.011% and 0.168% for the models established on integrating sphere diffuse reflectance spectra, the value of R2 were 96.64%, 91.51% and 97.45%, respectively. For the models on diffuse reflectance optic fiber probe spectra, the values of RMSEP were 0.361%, 0.012% and 0.193%, respectively, the values of R2 were 81.03%, 84.48% and 91.39%, respectively. T test results showed that there was no significant difference between actual values and the values predicted by the NIR models. Although the optical integrating sphere got a little higher prediction accuracy and stability than the optical fiber diffuse reflectance probe, both sampling methods could meet the rapid non-destructive determination of the amounts fat, protein and water in pork meat, and the latter is more suitable for hand-held and convenient.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133799565","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}

{"title":"Terahertz Porous Fibers with Random Core Distributions","authors":"J. Bai, Zhan Guo, Jining Li, Xianghui Wang, Hui Zhang, Shengjiang Chang","doi":"10.1109/SOPO.2010.5504290","DOIUrl":"https://doi.org/10.1109/SOPO.2010.5504290","url":null,"abstract":"We confirm firstly to our knowledge that terahertz waves can be guided in a porous fiber with a core of random arrangement of sub-wavelength air holes. Numerical simulations show that many of the properties previously attributed to periodic porous fibers, in particular, low loss and low dispersion, can also be obtained with random porous fibers. We provide that the dispersion can be improved almost 2 times by randomly distributing air holes in the core relative to periodic fibers at 1 THz. However, the dispersions are not sensitive to different random structures.","PeriodicalId":155352,"journal":{"name":"2010 Symposium on Photonics and Optoelectronics","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115639548","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}