Volume 7,Issue 6,2011 Table of Contents

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  • 1  Design of chirped fiber gratings for optical beamforming networks
    Ye Ying-bo Shi Pei-ming Huang Shan-guo Zhou jing
    2011, 7(6):401-404.
    [Abstract](4215) [HTML](0) [PDF 0.00 Byte](242)
    Abstract:
    The properties of the linear chirped fiber grating (CFG) which is used in the true time delay unit of the optical beamforming networks (OBFNs) are studied intensively through theoretical analyses and numerical calculations. It is concluded that the dispersion of the CFG is equal to 1/(3Gc), where G is the chirp coefficient of CFG and c is the light speed. Based on this relationship, a simplified designing process of a CFG which satisfies the requirements of the OBFN is given. The simulation resu..
    2  High damage threshold HfO2/SiO2 multilayer mirrors deposited by novel remote plasma sputtering
    Xu Ying Chen Nan Bu Yi-kun
    2011, 7(6):405-409.
    [Abstract](4302) [HTML](0) [PDF 0.00 Byte](227)
    Abstract:
    Sputtering deposition coatings offer significant advantages on electron beam (EB) deposition, including high packing density, environmental stability and extremely low losses. But the inherent high compressive stress affects its application in high power laser system. This paper describes the technical feasibility of high damage threshold laser mirrors deposited by a novel remote plasma sputtering technique. This technique is based on generating intensive plasma remotely from the target and then...
    3  Plasmon-enhanced polymer bulk heterojunction solar cells with solution-processable Ag nanoparticles
    YAN Qi-qi QIN Wen-jing WANG Chao SONG Peng-fei DING Guo-jing YANG Li-ying YIN Shou-gen
    2011, 7(6):410-414.
    [Abstract](4270) [HTML](0) [PDF 0.00 Byte](248)
    Abstract:
    We report the plasmon-enhanced polymer bulk-heterojunction solar cells with Ag nanoparticles (AgNPs) obtained via chemical method. Here, the AgNPs films with different particle densities are introduced between the poly (3,4-ethylene dioxythiophene) poly (styrenesulfonate) (PEDOT: PSS) buffer layer and the poly (3-hexythiophene):[6,6]-phenyl-c61 butyric acid methyl ester (P3HT: PCBM) layer. By improving the optical absorption of the active layer owing to the localized surface plasmons, the power ...
    4  Terahertz generation based on four-wave mixing difference frequency by resonance-enhanced third-order nonlinear of media
    Zhang Shao-hua Yao Jian-quan Zhou Rui Wen Wu-qi Xu De-gang Wang Peng
    2011, 7(6):415-418.
    [Abstract](4255) [HTML](0) [PDF 0.00 Byte](228)
    Abstract:
    Using nanosecond pulse near-infrared and mid-infrared laser pulses as the pump source, we obtain terahertz wave sources via four-wave difference frequency mixing. From the coupled wave theory, we analyze the four-wave mixing process of GaSe crystal and alkali metal vapor in detail, get the analytical expression of terahertz wave output power, and discuss the conditions for achieving phase matching. By adjusting the pump frequency, the third-order nonlinear polarization of alkali metal vapor is r...
    5  Study on a novel photonic crystal temperature sensor
    FU Hai-wei ZHAO Hui QIAO Xue-guang LI Yan ZHAO Da-zhuang YONG Zhen
    2011, 7(6):419-422.
    [Abstract](4213) [HTML](0) [PDF 0.00 Byte](222)
    Abstract:
    In this paper, a model of photonic crystal temperature sensor based on crystal microcavity in a straight photonic crystal waveguide is proposed. The transmission characteristics of light in the sensor under different temperatures are simulated by using finite-difference time-domain (FDTD) method. The thermal expansion and thermal-optic effects of silicon are taken into account. The results show that the resonant wavelength of microcavity increases linearly as the temperature rising. The waveleng...
    6  A polymer electro-optic modulator with ultra wide-band and low driving voltage
    Kambiz Abedi Habib Vahidi
    2011, 7(6):423-426.
    [Abstract](4829) [HTML](0) [PDF 0.00 Byte](222)
    Abstract:
    In this paper, a polymer electro-optic modulator is designed and simulated using the full vectorial finite element method. First order edge elements are used in finite element implementation, and the finite element technique is used to obtain modulator response thoroughly. From the numerical analysis, frequency dispersions of modulator’s important parameters, such as microwave effective index nm , microwave characteristic impedance ZC and microwave loss a, are extracted. Our design exhibits elec...
    7  Color tuning of Eu-Tb co-doped borophosphate glasses for white light through valence state adjustment
    Xu Suo-cheng Zheng Xi Tian Hua Lv Tian-shuai Wang Peng Wang Da-jian
    2011, 7(6):427-430.
    [Abstract](4800) [HTML](0) [PDF 0.00 Byte](189)
    Abstract:
    The dependence of color points of white light on the composition of borophosphate glasses co-doped with europium (Eu) and terbium (Tb) has been investigated in terms of valence change of rare earth ions. Under ultraviolet (UV) excitation, the white light is observed to be from a combination of 4f65d→4f7 band transition emission at 425 nm for Eu2+, 5D0→7FJ (J=1, 2) line-emissions at 593 nm and 611 nm for Eu3+, and 5D4→7F5 band transition emission at 545 nm for Tb3+. By varying the glass compositi...
    8  Characterization of sputtered ZnO films under different sputter-etching time of substrate
    Li Cui-ping Yang Bao-he Qian Li-rong Xu Sheng Dai Wei Li Ming-ji Li Xiao-wei Gao Cheng-yao
    2011, 7(6):431-436.
    [Abstract](4224) [HTML](0) [PDF 0.00 Byte](226)
    Abstract:
    Polycrystalline ZnO films are prepared using radio frequency magnetron sputtering on glass substrates which are sputter-etched for different time. Both the size of ZnO grains and the root-mean-square (RMS) roughness decrease, as the sputter-etching time of the substrate increases. More Zn atoms are bound to O atoms in the films, and the defect concentration is decreased with increasing sputter-etching time of substrate. Meanwhile, the crystallinity and c-axis orientation are improved at longer s...
    9  Angular tuning of defect modes spectra for one dimensional photonic crystal filters with a liquid crystal layer
    HE Jie SONG Li-tao WANG Hua-lei HAN Yi-ang LI Tao
    2011, 7(6):437-439.
    [Abstract](4361) [HTML](0) [PDF 0.00 Byte](221)
    Abstract:
    A tunable photonic crystal filter with a twisted nematic liquid crystal layer is proposed. The defect modes spectra with varying incident angles are discussed in detail by 4x4 matrix method. The results show that the defect modes are mainly decided by the applied voltage when the incident angle is smaller than 8o. As the incident angle further increases, the band gap and the defect modes shift toward the shorter wavelength side, and the changes of the two modes are different. In the lower voltag...
    10  A millimeter-wave WDM-ROF system based on supercon- tinuum technique
    Yuan Quan-xin YIN Xiao-li XIN Xiang-jun YU Chong-xiu CHEN Yu-lu Liu Bo
    2011, 7(6):440-442.
    [Abstract](4222) [HTML](0) [PDF 0.00 Byte](216)
    Abstract:
    In this paper, a new millimeter-wave (mm-wave) wavelength division multiplexing (WDM) system based on radio-over-fiber (ROF) technology is proposed. In this approach a multi-wavelength light source is obtained by supercontinuum (SC) technique, and mm-wave signals are obtained by using optical heterodyning method. We experimentally demonstrate the generation of optical carriers for 6-WDM channels, obtain 40 GHz mm-wave signals by employing optical heterodyne technique, and successfully achieve lo...
    11  Study on transmission characteristics of photonic crystal fiber gratings with periodic air hole deformation
    LIU Yan-yan Tian Che QI Yue-feng GUO Wen-guang
    2011, 7(6):443-446.
    [Abstract](4277) [HTML](0) [PDF 0.00 Byte](207)
    Abstract:
    The paper studies a kind of improved photonic crystal fiber gratings fabricated by CO2 laser heating method. The effective refractive index of cladding induced by periodic air hole deformation is computed using multipole method, and the relationship between the effective refractive index and the collapse of air-holes is discussed, thereby the modulation expression of effective refractive index is obtained. The grating transmission characteristics are simulated. The results indicate that with the...
    12  Influence of Raman effect on the noise characteristics in a dual pump FOPA
    Cheng Xiao-peng Yu Chong-xiu Deng Yun-yi Sang Xin-zhu Yuan Jin-hui Rao Lan
    2011, 7(6):447-450.
    [Abstract](4152) [HTML](0) [PDF 0.00 Byte](198)
    Abstract:
    Influence induced by Raman effect on the noise characteristics of a depleted and lossy dual pump fiber optical parametric amplifier (FOPA) is investigated. Taking the Raman effect into account, the modified coupled amplitude equations are firstly built, then the influences of Raman effect on the stokes and anti-stokes wavelengths with different initial signal powers are further analyzed. Besides, the effect on the FOPA gain is also shown with the same initial signal power and constant noise figu...
    13  Experiment study of ATP system for free-space optical communications
    XIAO Yong-jun LIU Yan-fei DONG Ran XIONG Zhun
    2011, 7(6):451-453.
    [Abstract](4194) [HTML](0) [PDF 0.00 Byte](187)
    Abstract:
    To meet the requirement of high tracking angular accuracy for the acquisition, tracking, and pointing (ATP) subsystem of the free-space optical communication, and provide the basis for the further optical communication between maritime mobile platforms, the experimental system, which executing part for the fine tracking is voice coil motor with high frequency and good performance for error compensation, is established, and the whole system can be controlled by personal computer. A series of expe...
    14  Performance study of an OFDM visible light communication system based on white LED array
    TIAN Chong-wen LI Yan-ting YE Wei-lin QUAN Xiang-yin SONG Zhan-wei ZHENG Chuan-tao
    2011, 7(6):454-457.
    [Abstract](4747) [HTML](0) [PDF 0.00 Byte](194)
    Abstract:
    By introducing orthogonal frequency division multiplexing (OFDM) technology, a visible light communication (VLC) system using a 5x5 white LED array is studied in this paper. The OFDM transmitter and receiver are modeled through MATLAB/Simulink tool. The electrical-optical-electrical (EOE) response of the VLC channel, which is also the response of the detector, is derived based on Lambert’s lighting model. Then the modeling on the overall OFDM/VLC system is established by combining the above thre...
    15  Distributed optical fiber vibration sensing system based on polarization detection
    Liu Jia Yu Jin-long Guo Jing-zhong Gao Chao Wang Wen-rui Yang En-ze
    2011, 7(6):458-462.
    [Abstract](3934) [HTML](0) [PDF 0.00 Byte](209)
    Abstract:
    A novel distributed optical fiber vibration sensing system based on polarization detection is proposed and demonstrated. A Faraday rotator mirror is employed at the end of the system, which eliminates the slow polarization variation of signal light and only responses to rapid polarization change caused by external vibration interference. Based on the sensing signal characteristics, the location of polarization disturbance point can be detected accurately. Experiments on polarization controller s...
    16  C2H2 sensing at V1+V3 band with a hollow-core photonic bandgap fiber
    Jing Lei Yao Jian-quan Huang Xiao-hui Lu Ying
    2011, 7(6):463-465.
    [Abstract](3994) [HTML](0) [PDF 0.00 Byte](189)
    Abstract:
    In this paper, we demonstrate the acetylehe (C2H2) sensor with high sensitivity using a hollow-core photonic bandgap fiber (HC-PCF). Experiments for measuring C2H2 concentrations in gas mixture are performed. Using a 2 m-long HC-PCF as gas cell, the spectrum of acetylene at n1+n3 band has been measured, and the P11-branch has been selected for the purpose of sensing. A minimum detectivity of 143 parts per million by volume (ppmv) for the system configuration is estimated. 更多还原
    17  An on-line remote supervisory system for microparticles based on image analysis
    Liu Wei-hua Jiang Ming-shun Sui Qing-mei
    2011, 7(6):466-469.
    [Abstract](4084) [HTML](0) [PDF 0.00 Byte](211)
    Abstract:
    A new on-line remote particle analysis system based on image processing has been developed to measure microparticles. The system is composed of particle collector sensor (PCS), particle image sensor (PIS), image remote transmit module and image processing system. Then some details of image processing are discussed. The main advantage of this system is more convenient in particle sample collection and particle image acquisition. The particle size can be obtained using the system with a deviation ...
    18  Influence of ring-down cavity parameters on intensity transmission property in trace gas concentration measurement
    LI Zhi-quan YAN Ju-bing SUN Yu-chao LI Wen-chao
    2011, 7(6):470-474.
    [Abstract](3869) [HTML](0) [PDF 0.00 Byte](206)
    Abstract:
    In this paper, we describe the basic principles and system design of continuous wave cavity ring-down spectroscopy (CW-CRDS). We also particularly study the nature and the behavior of a novel method to detune a laser and apply it to a cavity ring-down spectroscopy experiment. Both simulations and experiments are completed on the relation between the transmission characteristic and different reflectivities, as well as scanning speed. Output electric field equation is deduced. It has been investig..
    19  Quantum field entropy of the system with interaction between moving Bell-state atoms and coherent light field
    Zhang Cai-hua Sachuerfu Gerile
    2011, 7(6):475-477.
    [Abstract](3966) [HTML](0) [PDF 0.00 Byte](200)
    Abstract:
    The field entropy of the system with two moving atoms interacting with the coherent state is investigated by means of the full quantum theory. Under the different initial states with two atoms, the influences of the light field intensity and the atomic motion on the field entropy are discussed. The results indicate that the motion of the atoms leads to strict periodicity in the field entropy evolution. When the two atoms are in the bell state initially, the system is in a completely disentangled...
    20  light intensity at the return place and encirclement power ratio for the distorted reflected beam based on cat-eye effect
    Zhao Yan-zhong Sun Hua-yan Zhang Lai-xian Zheng Yong-hui
    2011, 7(6):478-482.
    [Abstract](4060) [HTML](0) [PDF 0.00 Byte](201)
    Abstract:
    Based on the definition of second order moment and the approximate three-dimensional analytical formula for probe detected laser beam passing through a cat-eye optical lens with center shelter and oblique detector, the analytical expression of the encirclement power ratio of the cat-eye effect reflected light under far-field condition has been deduced. Variable laws of light intensity at the return place and encirclement power ratio are performed by numerical calculation, and are analyzed physic..
    21  《OPTOELECTRONICS LETTERS》Content Index to Vol.7 (2011)
    2011, 7(6):483-490.
    [Abstract](4051) [HTML](0) [PDF 0.00 Byte](202)
    Abstract:
    22  Information for Contributors
    2011, 7(6):491-491.
    [Abstract](3837) [HTML](0) [PDF 0.00 Byte](211)
    Abstract:
    The goal of Optoelectronics Letters is to rapidly report original,new and important results in the fields of photonics and optoelectronics in English, to advance the international academic exchanges.Optoelectronics Letters pays a particularly attention to the cross 更多还原