Journals >Chinese Optics Letters
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2003
Volume: 1 Issue 9
20 Article(s)
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Fiber Optics and Optical Communications
The final limitation of receiver terminal performance with remotely pumped preamplifiers
Wei Zhang, Lili Sun, Yi Ni, Jiangde Peng, and Xiaoming Liu
In this paper, the performance of receiver terminals with remotely pumped preamplifiers (RPPAs) is analyzed by numerical simulation and experiment. Both simulation and experiment show that there is an optimal RPPA location and optimal pump power according to the highest performance. The amplified spontaneous Raman scatIn this paper, the performance of receiver terminals with remotely pumped preamplifiers (RPPAs) is analyzed by numerical simulation and experiment. Both simulation and experiment show that there is an optimal RPPA location and optimal pump power according to the highest performance. The amplified spontaneous Raman scattering (ASRS) self-oscillation caused by Rayleigh backscattering (RBS) and the lump reflector in transmission line are the final performance limitation..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09500 (2003)
An all-fiber type Er^(3+)/Yb^(3+) co-doped fiber laser
Jun Li, Yubin Guo, Tianshu Wang, Yadong Sun, Bing Bai, Xiaobin Li, and Guijun Hu
In this paper, a distributed Bragg reflection (DBR) type Er^(3+)/Yb^(3+) co-doped fiber laser of high output power and high slope efficiency was developed. Its gain medium was a 4.45-m-long Er^(3+)/Yb^(3+) co-doped fiber. When it was pumped by a 1064-nm Nd:YAG, the linewidth of output laser was measured as 0.072 nm by In this paper, a distributed Bragg reflection (DBR) type Er^(3+)/Yb^(3+) co-doped fiber laser of high output power and high slope efficiency was developed. Its gain medium was a 4.45-m-long Er^(3+)/Yb^(3+) co-doped fiber. When it was pumped by a 1064-nm Nd:YAG, the linewidth of output laser was measured as 0.072 nm by 3 dB and 0.192 nm by 25 dB at 1552.08 nm. The maximum output power was measured as 69 mW. Its power stability was < 5%, side mode suppression ratio was 59 dB, and the output wavelength stability was ±0.01 nm. The laser had a threshold of 12 mW and a slope efficiency of 22%..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09503 (2003)
Numerical analysis of polarization character in Yb^(3+)-doped fiber amplifiers
Yong Kong, Mingxiu Guo, and Yutian Lu
Polarization-dependent gain (PDG) and state of polarization (SOP) of the output signal light in Yb^(3+-) doped fiber amplifiers are studied by numerically stimulation, which showed that PDG of output signal light is not only changed with the input pump power and signal power, input polarization of pump and signal lightPolarization-dependent gain (PDG) and state of polarization (SOP) of the output signal light in Yb^(3+-) doped fiber amplifiers are studied by numerically stimulation, which showed that PDG of output signal light is not only changed with the input pump power and signal power, input polarization of pump and signal light, but also changed with the doping concentration, the cross-section anisotropy, the fiber length, the phase difference of the fiber, and so on. Moreover, SOP of the output signal light is studied. It is found that the polarization of output signal light is relative not only to the phase difference of the fiber, polarization of pump and signal light as the non-doped fiber, but also to PDG of output signal light, the cross-section anisotropy, the doping concentration, and so on, which is different to the non-doped fiber..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09506 (2003)
Optimizing the performance of TOAD by changing the wavelength and power of control pulse
Liangsheng Wen, Peng Zuo, Jian Wu, and Jintong Lin
The performance of terahertz optical asymmetric demultiplexer (TOAD) has been studied by modelling the semiconductor optical amplifier (SOA) in which the intraband effects had been taken into account. Numerical results are coincident with the experiment results. We interpret why there are three peaks in the switching wThe performance of terahertz optical asymmetric demultiplexer (TOAD) has been studied by modelling the semiconductor optical amplifier (SOA) in which the intraband effects had been taken into account. Numerical results are coincident with the experiment results. We interpret why there are three peaks in the switching window, which has never been reported before. In addition, we put forward the definition of the flatness of the switching window of TOAD for the first time By analysing the different phase of clockwise and counter clockwise signal pulse changed by SOA, appropriate peak power of control pulseand wavelength of signal and control pulse have been calculated in order to obtain large output power and flat switching window of TOAD..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09509 (2003)
Variable time-period optical switching: a novel OBS implementation
Jinsong Zhang, Mingcui Cao, Fengguang Luo, and Tao Chen
In this paper, we proposed a novel optical switching method based on optical burst switching (OBS), we call it variable time-period optical switching (VTPOS). It can both support circuit services and other immerged packet services. It has better usability of bandwidth, shorter offset and latency time than others of uniIn this paper, we proposed a novel optical switching method based on optical burst switching (OBS), we call it variable time-period optical switching (VTPOS). It can both support circuit services and other immerged packet services. It has better usability of bandwidth, shorter offset and latency time than others of unidirectional transport signaling mechanisms for OBS. It supports deflection switching for improve blocking performance without the need of schedule buffer. It introduces a time pointer and phase indicator that made synchronous more precisely and requires less guard time, it also classifies the different services classes with a relative QoS model..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09513 (2003)
Image Processing
Robust protein microarray image segmentation using improved seeded region growing algorithm
Liqiang Wang, Xuxiang Ni, and Zukang Lu
Protein microarray technology has recently emerged as a powerful tool for biomedical research. Before automatic analysis the protein microarray images, protein spots in the images must be determined appropriately by spot segmentation algorithm. In this paper, an improved seeded region growing (ISRG) algorithm for proteProtein microarray technology has recently emerged as a powerful tool for biomedical research. Before automatic analysis the protein microarray images, protein spots in the images must be determined appropriately by spot segmentation algorithm. In this paper, an improved seeded region growing (ISRG) algorithm for protein microarray segmentation is presented, the seeds are obtained by finding the positions of the printed spots, and the protein spot regions are grown through these seeds. The experiment results show that the presented algorithm is accurate for adaptive shape segmentation and robust for proteinmicroarray images contaminated by noise..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09520 (2003)
Image fusion using non-separable wavelet frame
Hong Wang, Zhongliang Jing, and Jianxun Li
In this paper, an image fusion method is proposed based on the non-separable wavelet frame (NWF) for merging a high-resolution panchromatic image and a low-resolution multispectral image. The lowfrequency part of the panchromatic image is directly substituted by multispectral image. As a result, the multispectral inforIn this paper, an image fusion method is proposed based on the non-separable wavelet frame (NWF) for merging a high-resolution panchromatic image and a low-resolution multispectral image. The lowfrequency part of the panchromatic image is directly substituted by multispectral image. As a result, the multispectral information of the multispectral image can be preserved effectively in the fused image. Due to multiscale method for enhancing the high-frequency parts of the panchromatic image, spatial information of the fused image can be improved. Experimental results indicate that the proposed method outperforms the intensity-hue-saturation (IHS) transform, discrete wavelet transform and separable wavelet frame inpreserving spectral and spatial information..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09523 (2003)
Integrated Optics
SOI thermo-optic modulator with fast response
Xiaolong Wang, Jingwei Liu, Qingfeng Yan, Shaowu Chen, and Jinzhong Yu
Silicon-on-insulator (SOI) technology offers tremendous potential for integration of optoelectronic functions on a silicon wafer. In this letter, a 1 × 1 multimode interference (MMI) Mach-Zender interferometer (MZI) thermo-optic modulator fabricated by wet-etching method is demonstrated. The modulator has an extinSilicon-on-insulator (SOI) technology offers tremendous potential for integration of optoelectronic functions on a silicon wafer. In this letter, a 1 × 1 multimode interference (MMI) Mach-Zender interferometer (MZI) thermo-optic modulator fabricated by wet-etching method is demonstrated. The modulator has an extinction ratio of -11.0 dB, extra loss of -4.9 dB and power consumption of 420 mW. The response time is less than 30 μs..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09527 (2003)
1.55-μm Si-based MOEMS optical tunable filter
Yuhua Zuo, Changjun Huang, Buwen Cheng, Xiao Cai, Rongwei Mao, Chuanbo Li, Liping Luo, Junhua Gao, Yunxia Bai, Lei Jiang, Chaohua Ma, Jialian Zhu, Liangchen Wang, Jinzhong Yu, and Qiming Wang
A prototype 1.55-μm Si-based micro-opto-electro-mechanical-systems (MOEMS) tunable filter is fabricated, employing surface micromachining technology. Full-width-at-half-maximum (FWHM) of the transmission spectrum is 23 nm. The tuning range is 30 nm under 50-V applied voltage. The device can be readily integrated with rA prototype 1.55-μm Si-based micro-opto-electro-mechanical-systems (MOEMS) tunable filter is fabricated, employing surface micromachining technology. Full-width-at-half-maximum (FWHM) of the transmission spectrum is 23 nm. The tuning range is 30 nm under 50-V applied voltage. The device can be readily integrated with resonant cavity enhanced (RCE) detector and vertical cavity surface emitting laser (VCSEL) to fabricate tunable active devices..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09529 (2003)
Lasers and Laser Optics
Double-pass ytterbium-doped fiber amplifier with high gain coefficient and low noise figure
Anting Wang, Meishu Xing, Guanghui Chen, Wenkui Yang, Hai Ming, Jianping Xie, and Yunxia Wu
We have proposed and demonstrated a double-pass ytterbium-doped fiber amplifier using an optical circulator and a fiber Bragg grating as reflector. When the signal has passed through the ytterbium-doped fiber once, it reflects off a 0.2-nm passive fiber Bragg grating filter. This reduces amplified spontaneous emission We have proposed and demonstrated a double-pass ytterbium-doped fiber amplifier using an optical circulator and a fiber Bragg grating as reflector. When the signal has passed through the ytterbium-doped fiber once, it reflects off a 0.2-nm passive fiber Bragg grating filter. This reduces amplified spontaneous emission (ASE) noise from the first pass. The input signal light is amplified both forward and backward through ytterbium-doped fiber. With this double-pass configuration, 1053.15-nm unsaturated signal gain of 28 dB, gain coefficient of 1.1 dB/mW, and noise figure of less than 4 dB are achieved at 977-nm pump power of 68 mW. It is also found that this double-pass configure provides enhancing gain coefficient and improving noise figure by comparison with single-pass configuration..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09532 (2003)
600-W lamp pumped CW Nd:YAG laser
Qiang Li, Zhimin Wang, Zhiyong Wang, Zhensheng Yu, Hong Lei, Jiang Guo, Gang Li, and Tiechuan Zuo
A lamp pumped CW Nd:YAG laser is presented in this paper for the requirement of industrial application. The main factors, which affect output power and beam quality of high power solid-state laser module, are theoretically analyzed. Total electro-optics efficiency of lamp pumped Nd:YAG crystal as high as 4.0% is obtainA lamp pumped CW Nd:YAG laser is presented in this paper for the requirement of industrial application. The main factors, which affect output power and beam quality of high power solid-state laser module, are theoretically analyzed. Total electro-optics efficiency of lamp pumped Nd:YAG crystal as high as 4.0% is obtained, and output power is higher than 647 W with beam parameter product 22 mm·mrad..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09535 (2003)
Comparison of different side-pumping configurations for high power laser diode pumped solid-state laser
Junqing Meng, Weibiao Chen, Xia Hou, and Qiquan Hu
Ray-tracing method is used to simulate the distribution of absorption in crystal rod for different sidepumping configuration. The distribution of pumping power and absorption efficiency is compared, and the numerical results are presented. The results show that the more uniform pumping and the higher absorption coefficRay-tracing method is used to simulate the distribution of absorption in crystal rod for different sidepumping configuration. The distribution of pumping power and absorption efficiency is compared, and the numerical results are presented. The results show that the more uniform pumping and the higher absorption coefficient are obtained with a diffuse cavity. And the method of the slow axis of laser diode stack perpendicular to the axis of lasing gives the higher central pumping density..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09538 (2003)
High power CW diode-side-pumped Nd:YAG rod laser
Hailin Wang, Weiling Huang, Zhuoyou Zhou, and Hongbing Cao
We report on the characterization of a diode-side-pumped Nd:YAG rod laser operating at high CW output power. A four-fold pump configuration is designed and the pump light is directly coupled into the Nd:YAG rod without the help of any cylindrical lenses. The distribution of pump light in the Nd:YAG rod has been calculaWe report on the characterization of a diode-side-pumped Nd:YAG rod laser operating at high CW output power. A four-fold pump configuration is designed and the pump light is directly coupled into the Nd:YAG rod without the help of any cylindrical lenses. The distribution of pump light in the Nd:YAG rod has been calculated by using ray tracing program. The thermal lens effect of the Nd:YAG rod has been experimentally measured. A maximum output power of 800 W at 1064 nm in multimode operation is obtained for a pump power of 2400 W with 33% optical-optical efficiency. At the same time, the maximum beam parameter product of 25 mm·mrad is achieved..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09541 (2003)
Materials
Upconversion fluorescence spectroscopy of Er^(3+)-doped lead oxyfluorosilicate glass
Shiqing Xu, Zhongmin Yang, Guonian Wang, Shixun Dai, Lili Hu, and Zhonghong Jiang
Upconversion fluorescence emission of Er^(3+)-doped oxyfluorosilicate glass excited at 975 nm is experimentally investigated. The results reveal that the intense green and red emission, and weak blue emission centered at 525, 543, 655, and 410 nm, respectively. A two-photon upconversion process is assigned to the greenUpconversion fluorescence emission of Er^(3+)-doped oxyfluorosilicate glass excited at 975 nm is experimentally investigated. The results reveal that the intense green and red emission, and weak blue emission centered at 525, 543, 655, and 410 nm, respectively. A two-photon upconversion process is assigned to the green and red emission while a three-photon process is responsible for blue upconversion. The possible upconversion mechanisms are discussed based on excited state absorption and energy transfer between excited Er^(3+) ions. The intense upconversion fluorescence of Er^(3+)-doped lead oxyfluorosilicate glass may be a potentially useful material for developing upconversion optical devices..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09544 (2003)
Nonlinear Optics
Thermal character in organic polymers with nanojoule femtosecond laser ablation
Xiaochang Ni, Ching-Yue Wang, Yanfeng Li, Minglie Hu, Zhuan Wang, and Lu Chai
Ablation experiments with femtosecond (fs) laser pulse (pulse duration 37 fs, wavelength 800 nm) on organic polymers have been performed in air. The ablation threshold is found to be only several nanojoules. The diameters of the dots ablated in the organic polymers are influenced by the laser fluence and the number of Ablation experiments with femtosecond (fs) laser pulse (pulse duration 37 fs, wavelength 800 nm) on organic polymers have been performed in air. The ablation threshold is found to be only several nanojoules. The diameters of the dots ablated in the organic polymers are influenced by the laser fluence and the number of laser pulses. It is observed that heat is diffused in a threadlike manner in all directions around the central focus region.Explanations of the observed phenomena are resented. A one-dimensional waveguide is also ablated in the organic polymers..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09547 (2003)
Optical Devices
Design of tunable wavelength microcavity organic electroluminescent diode with liquid crystal
Haixing Chen, Jianpu Wang, Weidong Shen, Haifeng Li, Xu Liu, and Peifu Gu
A novel designed method for tunable wavelength microcavity organic electroluminescent diode (MOLED) based on the birefringence of liquid crystal was presented. By modulated the refractive index of liquid crystal, the device could radiate with different wavelength continuously. The simulated result showed that the tunabA novel designed method for tunable wavelength microcavity organic electroluminescent diode (MOLED) based on the birefringence of liquid crystal was presented. By modulated the refractive index of liquid crystal, the device could radiate with different wavelength continuously. The simulated result showed that the tunable range could reach to 60 nm and the full width of half maximum is 5.5 nm. The device could be applied to wavelength converter and tunable light source..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09550 (2003)
Holography
Particle digital in-line holography with spherical wave recording
Baozhen Ge, Qieni Lu, and Yimo Zhang
In this paper, we propose a method of digital in-line holography of particle. A diverging spherical beam is used for illumination in recording hologram, the complex amplitude distribution generated by particle field at a single plane located in the Fresnel diffraction region is recorded by CCD, and a plane beam for recIn this paper, we propose a method of digital in-line holography of particle. A diverging spherical beam is used for illumination in recording hologram, the complex amplitude distribution generated by particle field at a single plane located in the Fresnel diffraction region is recorded by CCD, and a plane beam for reconstructing hologram, then, the magnified image can be obtained by numerical reconstruction in computer. This procedure can be interpreted by Fourier optical theory and the theoretical analysis have been done in detail, the experimental results, the air freshener being subject, are also given..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09517 (2003)
Atomic and Molecular Physics
Imaging an atomic beam using fluorescence
Ming He, Jin Wang, and Mingsheng Zhan
A fluorescence detection scheme is applied to image an atomic beam. Using two laser diodes as the sources of detection light and pumping light respectively, the fluorescence image of the atomic beam is then observed by a commercial CCD-camera, which is corresponding to the atomic state and velocity distribution. The deA fluorescence detection scheme is applied to image an atomic beam. Using two laser diodes as the sources of detection light and pumping light respectively, the fluorescence image of the atomic beam is then observed by a commercial CCD-camera, which is corresponding to the atomic state and velocity distribution. The detection scheme has a great utilization in the experiments of cold atoms and atomic optics..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09497 (2003)
Ultrafast Optics
Photon-activated charge domain in high-gain photoconductive switches
Wei Shi, Huiying Dai, and Xiaowei Sun
We report our experimental observation of charge domain oscillation in semi-insulating GaAs photoconductive semiconductor switches (PCSSs). The high-gain PCSS is intrinsically a photon-activated charge domain device. It is the photon-activated carriers that satisfy the requirement of charge domain formation on carrier We report our experimental observation of charge domain oscillation in semi-insulating GaAs photoconductive semiconductor switches (PCSSs). The high-gain PCSS is intrinsically a photon-activated charge domain device. It is the photon-activated carriers that satisfy the requirement of charge domain formation on carrier concentration and device length product of 10^(12) cm^(-2). We also show that, because of the repeated process of domain formation, the domain travels with a compromised speed of electron saturation velocity and the speed of light. As a result, the transit time of charge domains in PCSS is much shorter than that of traditional Gunn domains..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09553 (2003)
The nonparaxial property of chirped pulsed beam
Daquan Lu, Wei Hu, Yizhou Zheng, and Zhenjun Yang
The nonparaxial property of the chirped pulsed beam is analyzed both quantitatively and qualitatively. Through the qualitative investigation of the paraxial approximation condition, we show there are chirpinduced changes in the nonparaxial propagation of the chirped pulsed beam. A quantitative nonparaxial correction waThe nonparaxial property of the chirped pulsed beam is analyzed both quantitatively and qualitatively. Through the qualitative investigation of the paraxial approximation condition, we show there are chirpinduced changes in the nonparaxial propagation of the chirped pulsed beam. A quantitative nonparaxial correction was developed by use of the perturbational technic and the Fourier transform for a few-cycle chirped pulsed beam with relative small chirp parameter. It was shown that the nonparaxial corrections were enhanced near the leading or trailing edge of pulse depending on weather the chirp parameter is positive or negative. An example for pulsed Gaussian beam driven by a chirped Gaussian pulse is shown in the numerical result to confirm our analysis..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 1, Issue 9, 09556 (2003)
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