Journals >Chinese Optics Letters
Contents
2005
Volume: 3 Issue 3
20 Article(s)
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Fiber Optics and Optical Communications
Analysis and simulation of XPM intensity modulation
Jing Huang, and Jianquan Yao
Based on the split-step Fourier method and small signal analysis, an improved analytical solution which describes the cross-phase modulation (XPM) intensity is derived. It can suppress the spurious XPM intensity modulation efficiently in the whole transmission fiber. Thus it is more coincidence with the practical resulBased on the split-step Fourier method and small signal analysis, an improved analytical solution which describes the cross-phase modulation (XPM) intensity is derived. It can suppress the spurious XPM intensity modulation efficiently in the whole transmission fiber. Thus it is more coincidence with the practical result. Furthermore, it is convenient, because it is independent of channel separation and the dispersion and nonlinear effects interact through the XPM intensity. A criterion of select the step size is described as the derived XPM intensity modulation being taken into account. It is non-uniform distribution and is the function of average signal power <P(z)> (or z). Compared with the conventional split-step method, the simulation accuracy is improved when the step size is determined by the improved XPM intensity..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03129 (2005)
Mode characteristics of hollow core Bragg fiber
Minning Ji, Zhidong Shi, and Qiang Guo
Analytical expression to calculate propagation constant and mode field of the hollow core Bragg fiber is derived. Numerical results are presented. It is shown that the fundamental mode of the hollow core Bragg fiber is circularly symmetric TE01 mode with no polarization degeneracy, while the higher order mode may be HEAnalytical expression to calculate propagation constant and mode field of the hollow core Bragg fiber is derived. Numerical results are presented. It is shown that the fundamental mode of the hollow core Bragg fiber is circularly symmetric TE01 mode with no polarization degeneracy, while the higher order mode may be HE11, TM01, or TE02 etc.. This property is different from conventional optical fiber that its fundamental mode is the linearly polarized HE11 mode and is polarization degeneracy..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03132 (2005)
Exact chirped multi-soliton solutions of the nonlinear Schrodinger equation with varying coefficients
Ruiyu Hao, Lu Li, Rongcao Yang, Zhonghao Li, and Guosheng Zhou
In this letter, exact chirped multi-soliton solutions of the nonlinear Schrodinger (NLS) equation with varying coefficients are found. The explicit chirped one- and two-soliton solutions are generated. As an example, an exponential distributed control system is considered, and some main features of solutions are shown.In this letter, exact chirped multi-soliton solutions of the nonlinear Schrodinger (NLS) equation with varying coefficients are found. The explicit chirped one- and two-soliton solutions are generated. As an example, an exponential distributed control system is considered, and some main features of solutions are shown. The results reveal that chirped soliton can all be nonlinearly compressed cleanly and efficiently in an optical fiber with no loss or gain, with the loss, or with the gain. Furthermore, under the same initial condition, compression of optical soliton in the optical fiber with the loss is the most dramatic. Also, under nonintegrable condition and finite initial perturbations, the evolution of chirped soliton has been demonstrated by simulating numerically..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03136 (2005)
Demonstration of an 8*10-Gb/s OTDM system
Li Huo, Yanfu Yang, Caiyun Lou, and Yizhi Gao
An 8*10 Gb/s optical time-division-multiplexing (OTDM) system was demonstrated with an electroabsorption modulator (EAM) based short pulse generator followed by a two-stage nonlinear compression scheme which generated stable 10-GHz, 2-ps full-width at half-maximum (FWHM) pulse train, an opto-electronic oscillator (OEO)An 8*10 Gb/s optical time-division-multiplexing (OTDM) system was demonstrated with an electroabsorption modulator (EAM) based short pulse generator followed by a two-stage nonlinear compression scheme which generated stable 10-GHz, 2-ps full-width at half-maximum (FWHM) pulse train, an opto-electronic oscillator (OEO) that extracted 10-GHz clock with a timing jitter of 300 fs from 80-Gb/s OTDM signal and a self cascaded EAM which produced a switching window of about 10 ps. A back-to-back error free demultiplexing experiment with a power penalty of 3.25 dB was carried out to verify the system performance..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03140 (2005)
Dynamic protected lightpath provisioning in mesh WDM networks
Guolong Zhu, Qingji Zeng, Tian Xu, Tong Ye, and Junjie Yang
This paper investigates the problem of dynamic protected lightpath services provisioning in optical mesh networks employing wavelength division multiplexing (WDM). A variety of schemes for dynamic protected services provisioning have been proposed, supporting a range of tradeoffs among restoration speed, capacity efficThis paper investigates the problem of dynamic protected lightpath services provisioning in optical mesh networks employing wavelength division multiplexing (WDM). A variety of schemes for dynamic protected services provisioning have been proposed, supporting a range of tradeoffs among restoration speed, capacity efficiency, and scalability. In this paper, we propose a novel scheme, called p-cycles-based maximum protected working capacity envelope (PC-MPWCE), which can offer an attractive combination of features: ring-like speed, mesh-like capacity efficiency, and good scalability. To evaluate the performance of PC-MPWCE, we compare it via simulation with 1+1 automatic protection switching (APS) and two well-known shared backup path protection (SBPP) on NSFNET. Our simulation results show that PC-MPWCE can achieve much better blocking performance than 1+1 APS, and perform the similar blocking performance and capacity efficiency as SBPP..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03143 (2005)
Image Processing
3D reconstruction based on spatial vanishing information
Yuan Shu, and Zheng Tan
An approach for the three-dimensional (3D) reconstruction of architectural scenes from two un-calibrated images is described in this paper. From two views of one architectural structure, three pairs of corresponding vanishing points of three major mutual orthogonal directions can be extracted. The simple but powerful cAn approach for the three-dimensional (3D) reconstruction of architectural scenes from two un-calibrated images is described in this paper. From two views of one architectural structure, three pairs of corresponding vanishing points of three major mutual orthogonal directions can be extracted. The simple but powerful constraints of parallelism and orthogonal lines in architectural scenes can be used to calibrate the cameras and to recover the 3D information of the structure. This approach is applied to the real images of architectural scenes, and a 3D model of a building in virtual reality modelling language (VRML) format is presented which illustrates the method with successful performance..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03146 (2005)
Integrated Optics
Aberration improvement of gradient index rod lens
Xianli Lang, Desen Liu, Tao Lv, and Xiaoping Jiang
The aberration of gradient index (GRIN) rod lenses induced by deviation from the ideal refractive index distribution is decreased by optimized thermal diffusion. The index distribution coefficients are estimated by a novel method. The lenses' heat treatment process and aberration testing system are described.The aberration of gradient index (GRIN) rod lenses induced by deviation from the ideal refractive index distribution is decreased by optimized thermal diffusion. The index distribution coefficients are estimated by a novel method. The lenses' heat treatment process and aberration testing system are described..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03152 (2005)
Two-dimensional overlapping-image multimode interference couplers
Yiling Sun, Xiaoqing Jiang, Yi Tang, and Minghua Wang
The overlapping-imaging effect of one-dimensional (1D) multimode interference (MMI) coupler is widened to study the two-dimensional (2D) MMI coupler. 2D overlapping-image MMI couplers permit uniform and nonuniform 2D power splitting. Analytical formulas are derived for the intensities and phases of the overlapping-imagThe overlapping-imaging effect of one-dimensional (1D) multimode interference (MMI) coupler is widened to study the two-dimensional (2D) MMI coupler. 2D overlapping-image MMI couplers permit uniform and nonuniform 2D power splitting. Analytical formulas are derived for the intensities and phases of the overlapping-images at the end of MMI section. The overlapping-imaging properties in 2D MMI couplers are also concluded. And the guided-mode propagation analysis method is used to confirm the analytical results..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03154 (2005)
Lasers and Laser Optics
A double wavelength DFB laser with an identical active area for CWDM
Hongyun Xie, Wei Wang, Fan Zhou, Jing Bian, Baojun Wang, and Lufeng Wang
A novel distribute feedback (DFB) laser which gave two different wavelengths under two distinct work conditions was fabricated. The laser consists of two Bragg gratings with different periods corresponding to wavelength spacing of 20 nm in an identical active area. When driving current was injected into one of the diffA novel distribute feedback (DFB) laser which gave two different wavelengths under two distinct work conditions was fabricated. The laser consists of two Bragg gratings with different periods corresponding to wavelength spacing of 20 nm in an identical active area. When driving current was injected into one of the different sections separately, two different wavelengths at 1542.4 and 1562.5 nm were realized. The side mode suppression ratio (SMSR) of 45 dB or more both for the two Bragg wavelengths were achieved. The fabricating process of the laser was just the same as that of traditional DFB laser diode. This device can be potentially used in coarse wavelength division multiplexer (CWDM) as a promising light source and the technology idea can be used to enlarge the transmission capacity in metro area network (MAN)..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03156 (2005)
The analysis of the transient temperature distribution of double-slab Nd:YAG laser medium
Yan Huang, Junqing Meng, Lingling Zhang, and Qiquan Hu
A novel double-slab Nd:YAG laser, which uses face-pumped slab medium cooled by liquid with different temperatures on both sides, is proposed. The thermal distortion of wavefront caused by the non-uniform temperature distribution in the laser gain media can be self-compensated. According to the method of operation, the A novel double-slab Nd:YAG laser, which uses face-pumped slab medium cooled by liquid with different temperatures on both sides, is proposed. The thermal distortion of wavefront caused by the non-uniform temperature distribution in the laser gain media can be self-compensated. According to the method of operation, the models of the temperature distribution and stress are presented, and the analytic solutions for the model are derived. Furthermore, the numerical simulations with pulse pumping energy of 10 J and repetition frequencies of 500 and 1000 Hz are calculated respectively for Nd:YAG laser medium. The simulation results show that the temperature gradient remains the approximative linearity, and the heat stress is within the extreme range. Then the absorption coefficient is also discussed. The result indicates that the doping concentration cannot be too large for the high repetition frequency laser. It has been proved that the high repetition frequency, high laser beam quality, and high average output power of the order of kilowatt of Nd: YAG slab laser can be achieved in this structure..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03159 (2005)
Materials
Ti:sapphire laser pumped high average power laser crystal Nd:GGG with high efficiency output
Zhiwei Zhao, Benxue Jiang, Yinghua Zhang, Yupu Liu, Xiaodong Xu, Pingxin Song, Xiaodan Wang, and Jun Xu
High-quality neodymium doped GGG laser crystals have been grown by Czochralski (Cz) method. Results of Nd:GGG thin chip laser operating at 1.064 μm pumped by Ti:sapphire laser operating at 808 nm were reported. The slop efficiency was as high as 20%.High-quality neodymium doped GGG laser crystals have been grown by Czochralski (Cz) method. Results of Nd:GGG thin chip laser operating at 1.064 μm pumped by Ti:sapphire laser operating at 808 nm were reported. The slop efficiency was as high as 20%..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03163 (2005)
Theoretical study of Pr^(3+):ZBLAN upconversion ultraviolet fiber laser based on 4f5d state
Aiping Fang, Zhenwen Dai, Tao Luo, Guijuan Sun, Lijun Wang, and Zhankui Jiang
A theoretical study of the kinetics of two-step-excitation upconversion ultraviolet cw fiber laser based on the 4f5d state in Pr^(3+):ZBLAN is performed using steady population rate equations and light propagation equations. Under different Pr^(3+) concentrations, the dependence of the threshold pump powers on the otheA theoretical study of the kinetics of two-step-excitation upconversion ultraviolet cw fiber laser based on the 4f5d state in Pr^(3+):ZBLAN is performed using steady population rate equations and light propagation equations. Under different Pr^(3+) concentrations, the dependence of the threshold pump powers on the other pump power, the variations of laser output power with reflectivity of output coupler, pump powers and fiber length as well as the dependence of the optimum fiber length on pump powers are investigated. The results predict some optimum laser parameters for maximizing output power..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03164 (2005)
Nonlinear Optics
Investigation of near-collinear degenerated quasi-phase matching optical parametric amplification using PPKTP crystal
Baozhen Zhao, Xiaoyan Liang, Yuxin Leng, Cheng Wang, Juan Du, Zhengquan Zhang, and Zhizhan Xu
The gain properties of near-collinear degenerated phase-matched optical parametric amplification (OPA) using PPKTP crystal are investigated theoretically. The results indicate that the type-0 phase matching of PPKTP has larger accepted angle and better gain spectrum by tuning crystal temperature or rotating crystal angThe gain properties of near-collinear degenerated phase-matched optical parametric amplification (OPA) using PPKTP crystal are investigated theoretically. The results indicate that the type-0 phase matching of PPKTP has larger accepted angle and better gain spectrum by tuning crystal temperature or rotating crystal angle..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03168 (2005)
Thin Films
Damage on HfO2/SiO2 high-reflecting coatings under single and multiple Nd:YAG laser pulse irradiation
Weidong Gao, Tao Wang, Yuanan Zhao, and Jianda Shao
The single- and multi-shot damage behaviors of HfO2/SiO2 high-reflecting (HR) coatings under Nd:YAG laser exposure were investigated. Fundamental aspects of multi-shot laser damage, such as the instability due to pulse-to-pulse accumulation of absorption defect and structural defect effect, and the mechanism of laser iThe single- and multi-shot damage behaviors of HfO2/SiO2 high-reflecting (HR) coatings under Nd:YAG laser exposure were investigated. Fundamental aspects of multi-shot laser damage, such as the instability due to pulse-to-pulse accumulation of absorption defect and structural defect effect, and the mechanism of laser induced defect generation, are considered. It was found in multi-shot damage, the main factors influencing laser-induced damage threshold (LIDT) are accumulation of irreversible changes of structural defects and thermal stress that induced by thermal density fluctuations..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03179 (2005)
Laser induced damage of multi-layer dielectric used in pulse compressor gratings
Weijin Kong, Yuanan Zhao, Tao Wang, Jianda Shao, and Zhengxiu Fan
Laser induced damage threshold (LIDT) of multi-layer dielectric used in pulse compressor gratings (PCG) was investigated. The sample was prepared by e-beam evaporation (EBE). LIDT was detected following ISO standard 11254-1.2. It was found that LIDTs of normal and 51.2 deg. incidence (transverse electric (TE) mode) werLaser induced damage threshold (LIDT) of multi-layer dielectric used in pulse compressor gratings (PCG) was investigated. The sample was prepared by e-beam evaporation (EBE). LIDT was detected following ISO standard 11254-1.2. It was found that LIDTs of normal and 51.2 deg. incidence (transverse electric (TE) mode) were 14.14 and 9.31 J/cm2, respectively. A Nomarski microscope was employed to map the damage morphology, and it was found that the damage behavior was pit-concave-plat structure for normal incidence, while it was pit structure for 51.2 deg. incidence with TE mode. The electric field distribution was calculated to illuminate the difference of LIDT between the two incident cases..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03181 (2005)
Quantum Optics
Conditional quantum CNOT gate between two four-level atoms
Yang Fan
We propose a scheme to implement a quantum controlled-NOT (CNOT) gate between two four-level atoms inside the detuned optical cavity. The system state is evolved inside the decoherence-free (DF) subspace through stimulated Raman processes, which yields the desired unitary evolution operation for the CNOT. Our scheme isWe propose a scheme to implement a quantum controlled-NOT (CNOT) gate between two four-level atoms inside the detuned optical cavity. The system state is evolved inside the decoherence-free (DF) subspace through stimulated Raman processes, which yields the desired unitary evolution operation for the CNOT. Our scheme is immune to decoherence due to dissipation of cavity excitation and spontaneous emission from the excited atomic level..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03176 (2005)
Atomic and Molecular Physics
A novel controllable double-layer magnetic lattice with cold atoms
Min Yun, and Jianping Yin
We propose a novel array of controllable double-well magnetic microtraps for cold atoms by using an array of square current-carrying wires and two additional bias magnetic fields. Arrays of double layer magneto-optical traps (MOTs) and Ioffe traps can be constructed by using same wire configurations and different curreWe propose a novel array of controllable double-well magnetic microtraps for cold atoms by using an array of square current-carrying wires and two additional bias magnetic fields. Arrays of double layer magneto-optical traps (MOTs) and Ioffe traps can be constructed by using same wire configurations and different currents and bias fields. Furthermore, the array of double-well magnetic microtraps can be continuously evolved as an array of single-well magnetic microtraps by reducing the currents in the wires. Our study shows that our scheme can be used to realize a controllable double-layer magnetic lattice with cold atoms, to form array of Bose-Einstein condensations (BECs), or to study atom interference, and so on..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03125 (2005)
Instrumentation, Measurement, and Metrology
Light extinction method for solubility measurement
Shui Wang, Jingkang Wang, Qiuxiang Yin, and Yongli Wang
A novel measurement method for chemical solubility determination is brought forward, in which the advantages of two kinds of traditional methods are united. The results show that the concentration of unsolved particles suspending in the solution can be determined by measuring I/I0 (ratio of the transmission intensity tA novel measurement method for chemical solubility determination is brought forward, in which the advantages of two kinds of traditional methods are united. The results show that the concentration of unsolved particles suspending in the solution can be determined by measuring I/I0 (ratio of the transmission intensity to the incident intensity) of the laser beam permeating through the solution according to Lamben-Beer law. The biggest relative deviation for the solubility data determined is less than 1.5% for the sparingly soluble substances and 0.3% for the opulently soluble substances. By comparison of the experimental solubility data with previous data, the light extinction method is demonstrated to be stable and reliable..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03149 (2005)
X-Ray Optics
A method based on diffraction theory for predicting 3D focusing performance of compound refractive X-ray lenses
Zichun Le, Kai Liu, and Jingqiu Liang
A method based on the diffraction theory for estimating the three-dimensional (3D) focusing performance of the compound refractive X-ray lenses is presented in this paper. As a special application, the 3D X-ray intensity distribution near the focus is derived for a plano-concave compound refractive X-ray lens. MoreoverA method based on the diffraction theory for estimating the three-dimensional (3D) focusing performance of the compound refractive X-ray lenses is presented in this paper. As a special application, the 3D X-ray intensity distribution near the focus is derived for a plano-concave compound refractive X-ray lens. Moreover, the computer codes are developed and some results of 3D focusing performance for a compound refractive X-ray lens with Si material are shown and discussed..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03184 (2005)
Optical Computing
An all-optical matrix multiplication scheme with non-linear material based switching system
Archan Kumar Das, and Sourangshu Mukhopadhyay
Optics is a potential candidate in information, data, and image processing. In all-optical data and information processing, optics has been used as information carrying signal because of its inherent advantages of parallelism. Several optical methods are proposed in support of the above processing. In many algebraic, aOptics is a potential candidate in information, data, and image processing. In all-optical data and information processing, optics has been used as information carrying signal because of its inherent advantages of parallelism. Several optical methods are proposed in support of the above processing. In many algebraic, arithmetic, and image processing schemes fundamental logic and memory operations are conducted exploring all-optical devices. In this communication we report an all-optical matrix multiplication operation with non-linear material based switching circuit..
Chinese Optics Letters
- Publication Date: Jan. 01, 1900
- Vol. 3, Issue 3, 03172 (2005)
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