Chinese Optics Letters

Wavelength pre-assignment collision schedule for wavelength-routed optical networks

Yiqiang Hua — Sun, 01 Nov 2009 00:00:00 EST

Yiqiang Hua, Yueming Lu, Tong Zhao, Yuefeng Ji, Baoquan Rao
A novel wavelength assignment scheme called the wavelength pre-assignment collision schedule (WPCS) is proposed for wavelength-routed networks. The WPCS pre-assigns the wavelength at the forward detection phase, and schedules the potential collision by priority. The potential collision is scheduled ... [Chin. Opt. Lett. 7, 978-982 (2009)]

Research on performance of multicasting in optical packet switched networks

Xin Liu — Sun, 01 Nov 2009 00:00:00 EST

Xin Liu, Yuefeng Ji, Lin Bai, Hongxiang Wang, Yongmei Sun
Different multicasting schemes in optical packet switched networks are discussed, including the parallel mode, serial mode, and hybrid mode multicasting schemes. Simulated modeling technique is applied to compare the network-level performance of the three multicasting schemes. A conclusion can be ... [Chin. Opt. Lett. 7, 983-985 (2009)]

Effect of the third-order filter term on soliton interactions in soliton transmission systems with filters

Yingji He — Sun, 01 Nov 2009 00:00:00 EST

Yingji He, Li Luo, Weiling Zhu, Hezhou Wang
The effect of the third-order filter term on soliton interactions in optical fibers with guiding filters is theoretically analyzed. We find that this term causes a significant difference to the interaction of solitons through filters among the regimes of without sliding, with up- and down-sliding ... [Chin. Opt. Lett. 7, 986-989 (2009)]

UWB monocycle pulse generation based on optical cross-polarization modulation

Shiguang Wang — Sun, 01 Nov 2009 00:00:00 EST

Shiguang Wang, Hongwei Chen, Minghua Chen, Shizhong Xie
A novel all-optical method for ultra-wideband (UWB) monocycle pulses generation based on cross polarization modulation (CPM) effect in highly nonlinear photonic crystal fiber is proposed and demonstrated. Due to the CPM effect between the probe light and the pump pulse, a pair of polarity-reversed ... [Chin. Opt. Lett. 7, 990-992 (2009)]

A compact single-polarization erbium-doped fiber laser by exploiting vernier effect

Xiangqiao Mao — Sun, 01 Nov 2009 00:00:00 EST

Xiangqiao Mao, Fengping Yan, Yongjun Fu, Lin Wang, Jian Peng, Lisong Liu, Shuisheng Jian
A compact single-polarization fiber laser with fiber Bragg gratings inscripted in a polarization-maintaining erbium-doped germanosilicate fiber is demonstrated experimentally. The single-wavelength and singlepolarization regime of our studied laser is achieved by applying a radial stress upon one ... [Chin. Opt. Lett. 7, 993-995 (2009)]

Image registration based on matrix perturbation analysis using spectral graph

Chengcai Leng — Sun, 01 Nov 2009 00:00:00 EST

Chengcai Leng, Zheng Tian, Jing Li, Mingtao Ding
We present a novel perspective on characterizing the spectral correspondence between nodes of the weighted graph with application to image registration. It is based on matrix perturbation analysis on the spectral graph. The contribution may be divided into three parts. Firstly, the perturbation ... [Chin. Opt. Lett. 7, 996-1000 (2009)]

High-efficiency spatial color separation method based on fractional Talbot effect

Qiaofeng Tan — Sun, 01 Nov 2009 00:00:00 EST

Qiaofeng Tan, Yan Zhang, Guofan Jin
Based on fractional Talbot effect, Talbot grating is adopted to realize spatial color separation with high light efficiency. For red and green colors, a two-step Talbot grating is optimized and the light efficiency reaches over 95%. The two-step Talbot grating is fabricated and tested. Experimental ... [Chin. Opt. Lett. 7, 975-977 (2009)]

Theoretical analysis on the efficiency of optical-optical double-color double-resonance multiphoton ionization

Guiyin Zhang Yidong Jin — Sun, 01 Nov 2009 00:00:00 EST

Guiyin Zhang, Yidong Jin
Analytic formula of the efficiency of optical-optical double-color double-resonance multi-photon ionization (OODR-MPI) is derived from the dynamic rate equation about the interaction of photon and material. Based on this formula, the influence of characteristic of the pump and probe laser on the ... [Chin. Opt. Lett. 7, 971-974 (2009)]

Imaging photothermal microscopy for absorption measurements of optical coatings

Chunxian Tao — Sun, 01 Nov 2009 00:00:00 EST

Chunxian Tao, Yuanan Zhao, Hongbo He, Dawei Li, Jianda Shao, Zhengxiu Fan
For absorption measurement of large-aperture optical coatings, a novel method of imaging photothermal microscopy based on image lock-in technique is presented. Detailed theoretical analysis and numerical calculation are made based on the image photothermal technique. The feasibility of this imaging ... [Chin. Opt. Lett. 7, 1061-1064 (2009)]

Identification of tartrazine and sunset yellow by fluorescence spectroscopy combined with radial basis function neural network

Jun Wang — Sun, 01 Nov 2009 00:00:00 EST

Jun Wang, Guoqing Chen, Tuo Zhu, Shumei Gao, Bailin Wei, Linna Bi
The fluorescence spectra of synthetic food dyes of sunset yellow and tartrazine are analyzed. The fluorescence peak wavelengths of sunset yellow and tartrazine are 576 and 569 nm, respectively, while the fluorescence spectra widths are 480-750 and 500-750 nm induced by ultraviolet light between ... [Chin. Opt. Lett. 7, 1058-1060 (2009)]

Surface-enhanced Raman spectroscopy of morphine in silver colloid

Shangyuan Feng — Sun, 01 Nov 2009 00:00:00 EST

Shangyuan Feng, Weiwei Chen, Wei Huang, Min Cheng, Juqiang Lin, Yongzeng Li, Rong Chen
We report the surface-enhanced Raman (SERS) spectra of morphine in silver colloid, and study the silver colloid enhanced effects on the Raman scattering of morphine. The Raman bands of morphine are assigned to certain molecule vibrations. The broad band in the long-wavelength region of the ... [Chin. Opt. Lett. 7, 1055-1057 (2009)]

Analysis of saturation signal correction of the troposphere lidar

Zhishen Liu — Sun, 01 Nov 2009 00:00:00 EST

Zhishen Liu, Zhigang Li, Bingyi Liu, Rongzhong Li
Usually, lidar detection systems are optimized for the measurement of the low intensity signal using the photon counting technique, but this approach results in the nonlinear signal response for the higher intensity signal. The problem is successfully solved by the combination of analog-to-digital ... [Chin. Opt. Lett. 7, 1051-1054 (2009)]

Non-classical correlation between a single photon and the collective spin excited state of a cold atomic ensemble

Xiaosong Lu — Sun, 01 Nov 2009 00:00:00 EST

Xiaosong Lu, Qunfeng Chen, Baosen Shi, Guangcan Guo
We experimentally establish a non-classical correlation between a single Stokes photon and the collective spin excited state of a cold atomic ensemble by using a spontaneous Raman scattering process. The correlation between them can be proved by transferring the spin excited state of the atomic ... [Chin. Opt. Lett. 7, 1048-1050 (2009)]

Optimization of line-tapered MMI devices using a genetic algorithm

Yongsheng Xiao — Sun, 01 Nov 2009 00:00:00 EST

Yongsheng Xiao, Jianjiang Zhou, Shujing Li, Lizhen Huang, Dingshan Gao, Huaming Wu
We discuss the optimal design of line-tapered multimode interference (MMI) devices using a genetic algorithm (GA). A 1×4 MMI device is designed as a numerical example. Compared with the conventional design based on self-imaging theory, the present method demonstrates superior performance with ... [Chin. Opt. Lett. 7, 1045-1047 (2009)]

Design and fabrication of a compact multimode interference splitter with silicon photonic nanowires

Jingtao Zhou — Sun, 01 Nov 2009 00:00:00 EST

Jingtao Zhou, Huajun Shen, Huihui Zhang, Xinyu Liu
A compact multimode interference (MMI) splitter with silicon photonic nanowires on silicon-on-insulator (SOI) substrate is designed and fabricated. The footprint of the MMI section is only approximately 3×10 (\mu m). The simulation results show that the device may have a low excess loss of ... [Chin. Opt. Lett. 7, 1041-1044 (2009)]

Widely continuous-tunable 2.789-4.957 µm twin MgO:PPLN cascaded optical parametric oscillator

Linzhong Xia — Sun, 01 Nov 2009 00:00:00 EST

Linzhong Xia, Hong Su, Shuangchen Ruan
An all-solid-state mid-infrared optical parametric oscillator with wide tunability by using two identical multi-grating periodically poled 5-mol.-% MgO-doped lithium niobate cascaded is reported. The pump laser is an acousto-optically Q-switched Nd:YAG laser with 150-ns pulse width at repetition ... [Chin. Opt. Lett. 7, 1038-1040 (2009)]

2-µm fluorescence and Raman spectra in high and low Al(PO_3)_3 content fluorophosphate glasses doped with Er-Tm-Ho

Meng Wang — Sun, 01 Nov 2009 00:00:00 EST

Meng Wang, Lixia Yi, Liyan Zhang, Guonian Wang, Lili Hu, Junjie Zhang
Thermal stability and 2-µm fluorescence of high and low Al(PO_3)_3 content of fluorophosphate glasses are investigated. Thermal stability of high Al(PO_3)_3 content of fluorophosphate glass is better than low Al(PO_3)_3 content of fluorophosphate glass. However, 2.04-µm fluorescence ... [Chin. Opt. Lett. 7, 1035-1037 (2009)]

Theoretical model and quantif ication of reflectance photometer

Lihua Huang — Sun, 01 Nov 2009 00:00:00 EST

Lihua Huang, Youbao Zhang, Chengke Xie, Jianfeng Qu, Huijie Huang, Xiangzhao Wang
The surface morphology of lateral flow (LF) strip is examined by scanning electron microscope (SEM) and the diffuse reflection of porous strip with or without nanogold particles is investigated. Based on the scattering and absorption of nanogold particles, a reflectance photometer is developed for ... [Chin. Opt. Lett. 7, 1031-1034 (2009)]

Diode-pumped Yb:Lu_2Si_2O_7 laser with tunable and efficient output

Jinping He — Sun, 01 Nov 2009 00:00:00 EST

Jinping He, Xiaoyan Liang, Lihe Zheng, Liangbi Su, Jun Xu, Zhizhan Xu
Diode-pumped laser action of a new crystal Yb^3+:_2Si_2O_7 (LPS) is demonstrated for the first time to our knowledge. An output power of 2.22 W at 1070 nm and a slope efficiency of 34.7% were achieved with a 5 at.-% Yb: LPS sample. The tuning can cover the range form 1034 to 1080 nm. [Chin. Opt. Lett. 7, 1028-1030 (2009)]

High power doubly resonant all-intracavity deep blue laser at 447 nm based on sum-frequency-mixing technology

Yongji Yu — Sun, 01 Nov 2009 00:00:00 EST

Yongji Yu, Guangyong Jin, Chao Wang, Xinyu Chen, Jiaxi Guo, Yibo Wang
A high power continuous-wave deep blue laser at 447 nm is obtained by using a doubly cavity and a type critical phase matching KTP crystal for intracavity sum-frequency-mixing. With the incident pump power of 240 W for the Nd:YAP crystal and 120 W for the other Nd:YAP crystal, the deep blue laser ... [Chin. Opt. Lett. 7, 1024-1027 (2009)]

A novel 852-nm tunable fiber laser

Yanlong Shen — Sun, 01 Nov 2009 00:00:00 EST

Yanlong Shen, Chun Gu, Lixin Xu, Anting Wang, Hai Ming, Yang Liu, Xiaobing Wang
We report a novel fiber laser operating at 850-nm band by using semiconductor optical amplifier and fiber grating. The laser system is stable, compact, and the operating wavelength can be tuned continuously from about 851 to 854 nm for Cs atomic clock system by stretching the fiber grating. An ... [Chin. Opt. Lett. 7, 1022-1023 (2009)]

Coherent combining of tunable erbium-doped fiber lasers by a single-mode fiber feedback loop

Bing Lei Ying Feng — Sun, 01 Nov 2009 00:00:00 EST

Bing Lei, Ying Feng
We experimentally demonstrate the coherent combining of two tunable erbium-doped fiber lasers by using a single-mode fiber feedback loop configuration. A single-mode fiber is arranged in the feedback loop to filter the far-field pattern, and the energy of desired in-phase mode is collected and ... [Chin. Opt. Lett. 7, 1018-1021 (2009)]

Diode-pumped self-Q-switched Cr,Nd:YAG laser with 7-W average output power

Yuxian Shi — Sun, 01 Nov 2009 00:00:00 EST

Yuxian Shi, Sumei Wang, Qinan Li, Jing Zhang, Dongxiang Zhang, Baohua Feng, Zhiguo Zhang, Shiwen Zhang
We report a diode-pumped self-Q-switched 1064-nm Cr,Nd:YAG laser with pulse duration in the range of 16?18 ns. The maximum average output power up to 7 W, corresponding to a slope efficiency of 33%, is obtained in a simple and compact linear cavity by using a plane-concave output coupler with a ... [Chin. Opt. Lett. 7, 1015-1017 (2009)]

Coaxial combination of coherent laser beams

Hongcheng Dong — Sun, 01 Nov 2009 00:00:00 EST

Hongcheng Dong, Xiao Li, Chaoyang Wei, Hongbo He, Yuanan Zhao, Jianda Shao, Zhengxiu Fan
Based on polarization state conversion, a technique for coaxially coherent combination of laser beams is introduced. Laser beams can be coaxially coupled into one beam with high combination efficiency and perfect beam quality. A polarized laser beam combination system based on master oscillator ... [Chin. Opt. Lett. 7, 1012-1014 (2009)]

Repetition rate tunable ultra-short optical pulse generation based on electrical pattern generator

Xin Fu — Sun, 01 Nov 2009 00:00:00 EST

Xin Fu, Hongming Zhang, Meng Yan, Minyu Yao
An actively mode-locked laser with tunable repetition rate is proposed and experimentally demonstrated based on a programmable electrical pattern generator. By changing the repetition rate of the electrical patterns applied on the in-cavity modulator, the repetition rate of the output optical pulse ... [Chin. Opt. Lett. 7, 1010-1011 (2009)]

Performance of dispersed Rayleigh interferometer on the active cophasing and alignment testbed

Shanshan Wang — Sun, 01 Nov 2009 00:00:00 EST

Shanshan Wang, Qiudong Zhu, Weirui Zhao, Lin Li, Genrui Cao
We report the laboratory experiment on a segmented mirror testbed that shows the use of a dispersed Rayleigh interferometer to phase segmented mirrors. Segment alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the three individual segments on the focal plane. A ... [Chin. Opt. Lett. 7, 1007-1009 (2009)]

A RNN-based objective video quality measurement

Xuan Huang — Sun, 01 Nov 2009 00:00:00 EST

Xuan Huang, Rong Zhang, Jianxin Pang
Technology used to automatically assess video quality plays a significant role in video processing areas. Because of the complexity of video media, there are great limitations to assess video quality with only one factor. We propose a new method using artificial random neural networks (RNNs) with ... [Chin. Opt. Lett. 7, 1004-1006 (2009)]

A method to obtain pulse contrast on a single shot

Xiaoping Ouyang — Sun, 01 Nov 2009 00:00:00 EST

Xiaoping Ouyang, Xiaoyan Li, Yanli Zhang, Zhaoyang Li, Guang Xu, Tao Wang, Baoqiang Zhu, Jianqiang Zhu
A novel method for obtaining a single shot multi-point high dynamic range pulse contrast measurement is presented. We use Dammann gratings to generate multiple beamlets by division of amplitude on ultrashort laser pulses. The analysis results show that this method can achieve high dynamic range in ... [Chin. Opt. Lett. 7, 1001-1003 (2009)]