Journals >Chinese Optics Letters
Contents
2003
Volume: 1 Issue 10
22 Article(s)
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Fiber Optics and Optical Communications
50-watt ytterbium-doped double-clad fiber laser
Qihong Lou, Jun Zhou, Jianqiang Zhu, Zhonglin Wu, Lingfeng Kong, Jingxing Dong, Zhenhuan Ye, Yunrong Wei, and Zhijiang Wang
A ytterbium-doped double-clad fiber laser with more than 50-W output, near diffraction-limited is demonstrated in SIOM. The optical-to-optical efficiency is about 44% with respect to incident pump power and the slope efficiency is 69% against launched pump power.A ytterbium-doped double-clad fiber laser with more than 50-W output, near diffraction-limited is demonstrated in SIOM. The optical-to-optical efficiency is about 44% with respect to incident pump power and the slope efficiency is 69% against launched pump power..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10559 (2003)
High accuracy wavelength locking of a DFB laser using tunable polarization interference filter
Xiyao Chen, Jianping Xie, Tianpeng Zhao, Hai Ming, Anting Wang, Wencai Huang, Liang Lu, and Lixin Xu
A temperature-tunable polarization interference filter (PIF) made of YVO4 crystal has been presented and applied for wavelength locking of a distributed feedback (DFB) semiconductor laser in dense wavelengthdivision-multiplexing (DWDM) optical communication systems. This new design offers a flexible way to monitor and A temperature-tunable polarization interference filter (PIF) made of YVO4 crystal has been presented and applied for wavelength locking of a distributed feedback (DFB) semiconductor laser in dense wavelengthdivision-multiplexing (DWDM) optical communication systems. This new design offers a flexible way to monitor and then lock an operating wavelength of DFB laser to any preselected point without dead spots. The results show that the laser wavelength can be locked with accuracy better than ±0.01 nm with much relaxed requirement on temperature stability of the filter..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10561 (2003)
Research on WDM optical fiber transmission system based on fiber Raman amplifier
Fei Xue, Kun Qiu, and Yue Chen
After wavelength division multiplexing (WDM) optical fiber transmission system based on fiber Raman amplifier (FRA) is investigated in detail, the influence of the collocation of dispersion compensation fiber (DCF), the dispersion coefficient, dispersion slope (DS), effective core area, nonlinear index, length of FRA, After wavelength division multiplexing (WDM) optical fiber transmission system based on fiber Raman amplifier (FRA) is investigated in detail, the influence of the collocation of dispersion compensation fiber (DCF), the dispersion coefficient, dispersion slope (DS), effective core area, nonlinear index, length of FRA, launch power and the bandwidth of Bessel filter on bit error rate (BER) is deduced. The influence of Rayleigh backscattering noise on optical signal noise ratio (OSNR) is also investigated, which affects the performance of long haul transmission badly. The result indicates that the broadband long haul transmission can be realized through the reasonable design of the fiber. The result is useful to the optimaldesign of the WDM optical fiber transmission system based on FRA..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10564 (2003)
Low cost, practical, all-digital open-loop fiber-optic gyroscope
Yuanhong Yang, Weixu Zhang, Jing Ma, and Xinjun Chen
A novel all-digital scheme for open-loop fiber-optic gyroscope (FOG), where only two key points of output wave were digitized directly, has been proposed. A control equation, with which the modulation depth of PZT modulator is stable when setting the modulation depth as 4.35 and a calculation equation, with which the SA novel all-digital scheme for open-loop fiber-optic gyroscope (FOG), where only two key points of output wave were digitized directly, has been proposed. A control equation, with which the modulation depth of PZT modulator is stable when setting the modulation depth as 4.35 and a calculation equation, with which the Sagnac phase can be worked out, are derived. A modulation depth control and an automatic correlation sampling and a gain control technology were induced. A photo-type FOG was made and tested. The good performance was achieved..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10567 (2003)
Numerical analysis of multicore photonic crystal fibers
Yanfeng Li, Qingyue Wang, and Minglie Hu
A Galerkin’s method-based numerical procedure is extended to obtain the modal field distribution of multicore photonic crystal fibers for the first time to our knowledge, which can reveal how the air hole size influences the mode coupling and how the coupling strength varies with wavelength. These results will be helpfA Galerkin’s method-based numerical procedure is extended to obtain the modal field distribution of multicore photonic crystal fibers for the first time to our knowledge, which can reveal how the air hole size influences the mode coupling and how the coupling strength varies with wavelength. These results will be helpful in the future design of multicore photonic crystal fibers with proper guidance properties..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10570 (2003)
Characteristics of the transmission spectrum of the long period fiber gratings based on the coupling of core mode to the higher order cladding modes
Zijia Zhang, and Wenkang Shi
The characteristics of the transmission spectrum of the Long-period fiber gratings (LPFGs) based on the coupling of core mode to a higher order cladding mode (HE mode) are investigated using the coupled mode theory. This kind of LPFGs is different from that based on the coupling of core mode to a lower order cladding mThe characteristics of the transmission spectrum of the Long-period fiber gratings (LPFGs) based on the coupling of core mode to a higher order cladding mode (HE mode) are investigated using the coupled mode theory. This kind of LPFGs is different from that based on the coupling of core mode to a lower order cladding mode because of the effect of the coupling of core mode to EH cladding mode. When the cladding mode order is higher, the coupling coefficients of core mode to HE and EH cladding modes are comparable and both of the propagation constants of HE and EH cladding modes approach, so the spectrum has an additional loss peak. The bandwidth of LPFG based on the coupling of core mode to different cladding mode differs greatly. With the change of the mode orders from lower to higher, the transmission spectrum changes from narrow to wide and more narrow..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10573 (2003)
Filter control polarization mode dispersion in dispersion managed soliton systems
Ming Xu, Tao Pu, Shuwen Yang, and Xianglin Yang
In this paper, the dispersion managed soliton (DMS) transmission equation is built on considering the effects of polarization mode dispersion (PMD) and filter control. The DMS transmission of filtering control in constant birefringence fibers is firstly analyzed by varitional method, from which the evolving rules of chIn this paper, the dispersion managed soliton (DMS) transmission equation is built on considering the effects of polarization mode dispersion (PMD) and filter control. The DMS transmission of filtering control in constant birefringence fibers is firstly analyzed by varitional method, from which the evolving rules of characteristical DMS parameters are obtained. Secondly, the stability of DMS transmission and its timing jitter are investigated in the random varying birefringence fibers with the conventional model of PMD. The results reveal that filter control DMS system has powerful robustness to PMD effects and DMS’s timing jitter can be decreased considerably with the help of filters..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10576 (2003)
Image Processing
Non-linearly weighted fuzzy correlation for color-image retrieval
Guoguang Mu, Hongchen Zhai, and Siyuan Zhang
An algorithm with non-linear weight factors in the summation process for fuzzy correlation of color histograms is presented, in which non-linear weights are assigned to some characteristic colors of interest. Experimental results show that this can improve the retrieval of color images with partial aberrations or with An algorithm with non-linear weight factors in the summation process for fuzzy correlation of color histograms is presented, in which non-linear weights are assigned to some characteristic colors of interest. Experimental results show that this can improve the retrieval of color images with partial aberrations or with local color characters..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10583 (2003)
Urban road area recognition in ITS based on mean shift method
Zhaoxue Chen, and Pengfei Shi
A color-based visual technique is described based on the mean shift image segmentation method providing relevant information for robust localization of the visible road area in Urban Intelligent Transportation System (U-ITS). The traffic image sequences are firstly trained to extract the background and then segmented iA color-based visual technique is described based on the mean shift image segmentation method providing relevant information for robust localization of the visible road area in Urban Intelligent Transportation System (U-ITS). The traffic image sequences are firstly trained to extract the background and then segmented into separated parts by the mean shift method as initialization, regions with the number of pixels not less than a threshold and with more uniform surfaces with the “same” color compared to their environment are filtered as recognized road area. The algorithm given in this paper can present road area recognition with arbitrary shapes, which is fit for unstructured road applications in urban cities very well..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10585 (2003)
Integrated Optics
A novel super-broadband travelling-wave modulator with nonperiodic domain inversions and ridge structure
Fuwen Zhang, Fushen Chen, and Kun Qiu
In order to obtain large broadband, a novel travelling-wave modulator with nonperiodic domain inversions and ridge structure is proposed. The composite structure is designed to achieve velocity matching between the optical wave and the microwave, to get a 50 Ω characteristic impedance and to reduce the loss of the micrIn order to obtain large broadband, a novel travelling-wave modulator with nonperiodic domain inversions and ridge structure is proposed. The composite structure is designed to achieve velocity matching between the optical wave and the microwave, to get a 50 Ω characteristic impedance and to reduce the loss of the microwave electrodes with finite element method (FEM). The calculation results show that the frequency response of the new device is flat up to 350 GHz with interaction length of 1 cm, characteristic impedance of 49 Ω, and microwave refractive index of 2.5..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10591 (2003)
Lasers and Laser Optics
Laser-diode-pumped 1319-nm monolithic non-planar ring single-frequency laser
Qing Wang, Chunqing Gao, Yan Zhao, Suhui Yang, Guanghui Wei, and Dongmei Hong 2
Single-frequency 1319-nm laser was obtained by using a laser-diode-pumped monolithic Nd:YAG crystal with a non-planar ring oscillator (NPRO). When the NPRO laser was pumped by an 800-μm fiber coupled laser diode, the output power of the single-frequency 1319-nm laser was 220 mW, and the slope efficiency was 16%. With aSingle-frequency 1319-nm laser was obtained by using a laser-diode-pumped monolithic Nd:YAG crystal with a non-planar ring oscillator (NPRO). When the NPRO laser was pumped by an 800-μm fiber coupled laser diode, the output power of the single-frequency 1319-nm laser was 220 mW, and the slope efficiency was 16%. With a 100-1m fiber coupled diode laser pumped, 99-mW single-frequency 1319-nm laser was obtained with a slope efficiency of 29%..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10594 (2003)
Solutions of the modification heating conduction equations of a kind of laser thermal effect
Lingyun Zhou, Canbang Zhang, Yiying Zhou, and Guangmin Wu
This paper has solved the Chester modified heat conduction equation of the different relaxation time τ value under different temperature conditions, different boundary conditions and the different initial conditions by different means of methods. These solutions can help to obtain temperature field of laser thermal effThis paper has solved the Chester modified heat conduction equation of the different relaxation time τ value under different temperature conditions, different boundary conditions and the different initial conditions by different means of methods. These solutions can help to obtain temperature field of laser thermal effects..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10597 (2003)
High repetition rate TEA CO_(2) laser with randomly coded wavelength selection
Jin Wu, Chongyi Wan, Rongqing Tan, Donglei Wang, and Yongxin Tang
High repetition rate transversely exited atmospheric pressure (TEA) CO_(2) laser with randomly coded wavelength selection is suggested. The laser wavelength is tuned by a Fabry-Perot (F-P) etalon of low fineness, whose space interval is controlled by a piezoelectric transducer (PZT). A digital controlled programmable vHigh repetition rate transversely exited atmospheric pressure (TEA) CO_(2) laser with randomly coded wavelength selection is suggested. The laser wavelength is tuned by a Fabry-Perot (F-P) etalon of low fineness, whose space interval is controlled by a piezoelectric transducer (PZT). A digital controlled programmable voltage source is introduced to vary the voltage applied on PZT so as to swiftly shift the laser output wavelength pulse by pulse. Detailed theoretical analysis is carried out by six-temperature mode rate equations..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10601 (2003)
Diode-pumped, Cr:YAG passively Q-switched and mode-locked Nd:YVO4/KTP green laser
Junying Wang, Quan Zheng, Qinghua Xue, and Huiming Tan
The phenomena of simultaneous Q-switching and mode-locking in a diode-pumped Nd:YVO_(4)/Cr:YAG/KTP green laser are reported and discussed in this paper. With 5.3-W pump power, by using a nearly hemispherical cavity (the cavity length is only 97 mm), the results of modulation depth of 70% and the period of 0.6 ns are obThe phenomena of simultaneous Q-switching and mode-locking in a diode-pumped Nd:YVO_(4)/Cr:YAG/KTP green laser are reported and discussed in this paper. With 5.3-W pump power, by using a nearly hemispherical cavity (the cavity length is only 97 mm), the results of modulation depth of 70% and the period of 0.6 ns are obtained, the output power and the repetitive frequency of Q-switched pulse are 90 mW and 12 kHz, respectively..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10604 (2003)
Characteristic of energy input for laser forming sheet metal
Liqun Li, Yanbin Chen, and Xiaosong Feng
Laser forming is a process in which laser-induced thermal deformation is used to form sheet metal without a hard forming tool or external forces. The energy input of laser beam is the key factor for the temperature and stress distribution of sheet metal. The purpose of this work is to investigate the influence of energLaser forming is a process in which laser-induced thermal deformation is used to form sheet metal without a hard forming tool or external forces. The energy input of laser beam is the key factor for the temperature and stress distribution of sheet metal. The purpose of this work is to investigate the influence of energy input condition on heat input and deformation angle for two-dimension laser forming. Variations in heat input resulting from material deformation was calculated and discussed in this paper at first. Furthermore, in laser forming under the condition of constant laser energy input, the effects of energy input mode on deformation angle and temperature field were investigated..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10606 (2003)
Applications of laser in the field of chemical solubility determination
Mingming Chen, Peisheng Ma, and Xinxing Liu
A novel experiment method for chemical solubility determination was brought forward, in which optics and chemistry principles are united and the change of laser intensity indicates the process of chemical dissolving. The more undissolved solid exists in the mixture of solute and solvent, the less transmitted laser inteA novel experiment method for chemical solubility determination was brought forward, in which optics and chemistry principles are united and the change of laser intensity indicates the process of chemical dissolving. The more undissolved solid exists in the mixture of solute and solvent, the less transmitted laser intensity is detected. Only when the transmitted laser intensity in stirring state and that in static state comes into equalization, the dissolving process stops. Under the help of laser intensity judgement, measurements turn to be more feasible and objective, especially at high pressure. The average relative errors for the solubility data determined in this paper are 2.3% for those in the minor value scope and 1.7%for those in the high value scope respectively. Comparison of the experimental solubility data with the literature ones demonstrates that the laser-aid solubility determination apparatus is stable and reliable..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10609 (2003)
Materials
Strong upconversion luminescence in Er^(3+)/Yb^(3+)-doped halide modified tellurite glass
Jianhu Yang, Lei Wen, Shixun Dai, Lili Hu, and Zhonghong Jiang
Upconversion luminescence of Er^(3+)/Yb^(3+)-doped halide tellurite glass is investigated experimentally upon 976-nm excitation. Three intense emissions centered at 525, 545 and 655 nm owing to the transitions (2)^H_(11/2) → (4)^I_(15/2), (4)^S_(3/2) → (4)^I_(15/2) and (4)^F_(9/2) → (4)^I_(15/2), respectively, are obseUpconversion luminescence of Er^(3+)/Yb^(3+)-doped halide tellurite glass is investigated experimentally upon 976-nm excitation. Three intense emissions centered at 525, 545 and 655 nm owing to the transitions (2)^H_(11/2) → (4)^I_(15/2), (4)^S_(3/2) → (4)^I_(15/2) and (4)^F_(9/2) → (4)^I_(15/2), respectively, are observed when pumping power is as low as 20 mW. The upconversion mechanisms and power dependent intensities are discussed. The high-populated (4)^I_(11/2) level is supposed to serve as the intermediate state responsible for the upconversion processes..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10611 (2003)
Nonlinear Optics
Optical properties and CO_(2) laser SHG with HgGa_(2)S_(4)
Deming Ren, Jinzhe Huang, Yanchen Qu, Xiaoyong Hu, Lili Zhang, Andreev Yuri, Geiko Pavel, Badikov Valerii, Lanskii Grigorii, and Tikhomirov Alexander
Optical properties and nonlinearity on phase-matching (PM) of two (yellow and orange) phase HgGa_(2)S_(4) crystals were investigated in details. Damage threshold was determined in comparison with middle infrared (IR) crystal at identical experimental conditions. Second harmonic generation (SHG) of 30 ns TEA CO2 laser pOptical properties and nonlinearity on phase-matching (PM) of two (yellow and orange) phase HgGa_(2)S_(4) crystals were investigated in details. Damage threshold was determined in comparison with middle infrared (IR) crystal at identical experimental conditions. Second harmonic generation (SHG) of 30 ns TEA CO2 laser pulses was realized with 5% efficiency in energy and 6.9% in peak power..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10613 (2003)
Optical Devices
Study on a MEMS silicon-based non-silicon mirror for an optical switch
Yuan Luo, Hongqiao Fu, and Shanglian Huang
A micro-electro-mechanical system (MEMS) silicon-based non-silicon mirror for a 2D optical switch is designed, fabricated and measured. The result shows that the mirror has good reflective performance. And driven by static electricity, it can rotate more than 10°at voltage less than 15 V. This kind of novel mirrorA micro-electro-mechanical system (MEMS) silicon-based non-silicon mirror for a 2D optical switch is designed, fabricated and measured. The result shows that the mirror has good reflective performance. And driven by static electricity, it can rotate more than 10°at voltage less than 15 V. This kind of novel mirror will have good potential applications for MEMS optical switches..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10616 (2003)
Thin Films
Antireflective films optimization of ZnS ceramics infrared windows
Lin Li, Lianhe Dong, and Liangzhao Huang
The transmittance characteristics of ZnS ceramics with infrared (IR) (3 - 5 and 8 - 12 μm) antireflective coatings are studied. The film designs are optimized with programmed software. A double-side and double-layer scheme is employed. Two different double-layers with proper parameters are coated onto each side of a ZnThe transmittance characteristics of ZnS ceramics with infrared (IR) (3 - 5 and 8 - 12 μm) antireflective coatings are studied. The film designs are optimized with programmed software. A double-side and double-layer scheme is employed. Two different double-layers with proper parameters are coated onto each side of a ZnS substrate. The measurement methods for transmittance are investigated. The measured transmittance for IR (3 - 5 and 8 - 12 μm) surpasses 70%..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10619 (2003)
Holography
Holographic storage scheme based on digital signal processing
Kebin Jia, Dapeng Yang, Shubo Dun, Shiquan Tao, and Mingyan Qin
In this paper, a holographic storage scheme for multimedia data storage and retrieval based on the digital signal processing (DSP) is designed. A communication model for holographic storage system is obtained on the analogy of traditional communication system. Many characteristics of holographic storage are embodied inIn this paper, a holographic storage scheme for multimedia data storage and retrieval based on the digital signal processing (DSP) is designed. A communication model for holographic storage system is obtained on the analogy of traditional communication system. Many characteristics of holographic storage are embodied in the communication model. Then some new methods of DSP including two-dimensional (2-D) shifting interleaving, encoding and decoding of modulation-array (MA) code and method of soft-decision, etc. are proposed and employed in the system. From the results of experiments it can be seen that those measures can effectively reduce the influence of noise. A segment of multimedia data, including video and audio data, is retrieved successfully after holographic storage by using those techniques..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10579 (2003)
Instrumentation, Measurement, and Metrology
Real-time phase-shifting techniques for determining the photoelastic parameters: a theoretical comparison
Zhenkun Lei, Yilan Kang, and Dazhen Yun
Among data acquisition techniques in digital photoelasticity, the integrated phase shifting technique (IPST) can real-time analyze the photoelastic parameters at a video rate of the high speed CCD camera. In this paper, fourteen algorithms are described by different configurations of the rotating an analyzer at a constAmong data acquisition techniques in digital photoelasticity, the integrated phase shifting technique (IPST) can real-time analyze the photoelastic parameters at a video rate of the high speed CCD camera. In this paper, fourteen algorithms are described by different configurations of the rotating an analyzer at a constant rate and an output quarter-wave plate at another constant rate. The theoretical comparisons of the algorithms are given by the simulated phase distributions of the isochromatic and isoclinic parameters of the disk under two cases that the load keeps unchangeable or linearly increasing in exposure time of the camera. Then a guideline is given to alleviate the influence of the load changing with time on the IPST..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 10, 10588 (2003)
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