最新刊期
卷 ， 期 2 ， 2012
- 摘要：By theoretical analysis and numerical simulation,a 100 Gbit/s optical Polarization-Multiplexed（POLMUX）-Carried-Suppressed Return-to-Zero（CSRZ）-Differential Phase-Shift Keying（DQPSK） transmission system is established and a Frequency Domain Phase Conjugation（FDPC）-based 100 Gbit/s optical transmission system studied.The analysis shows that FDPC can compensate both the system dispersion and nonlinear effects,having greater advantages than the conventional Dispersion Compensating Fiber（DCF）-based technologies.关键词：POLMUX-DQPSK;dispersion compensation;Optical Pphase Conjugation（OPC）
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发布时间： - 摘要：This paper describes briefly the development background and present conditions of all-optical Orthogonal Frequency-Division Multiplexing（OFDM） technology and summarizes the generation technologies for all-optical continuous and discrete OFDM signals.The all-optical continuous OFDM technology generates flat,stable,orthogonal and low-phase-noise comb spectrum,while the all-optical discrete OFDM technology realizes Optical Inverse Discrete Fourier Transform（OIDFT） and Optical Discrete Fourier Transform（ODFT） by using optical devices and methods.Compared with all-optical continuous OFDM technology,all-optical discrete OFDM technology is more scalable.关键词：all-optical continuous OFDM;all-optical discrete OFDM;generation technology
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发布时间： - 摘要：This article introduces three commonly used architectures of Passive Optical Network（PON） based on Orthogonal Frequency Division Multiplexing（OFDM）,i.e.WDM-OFDM-PON,TDM-OFDM-PON and ECDM-OFDM-PON.Furthermore,it discusses their respective advantages in transmission rate,ONU structure and bandwidth utility ratio.关键词：PON;OFDM;WDM;TDM;ECDM
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发布时间： - 摘要：This paper mainly studies on the route selection for the dynamic traffic grooming in Wavelength Division Multiplexing（WDM） optical networks and proposes a topology-integration-based dynamic traffic grooming algorithm.Its most important feature is merging physical topology and virtual topology and using the minimum-weight preferred method for route selection.Simulation results show that this algorithm improves resource utilization and reduces congestion rate without increasing link-setup delay,especially effective in high load conditions.关键词：optical network;dynamic traffic grooming;topology integration;load balancing
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发布时间： - 摘要：In Polarization Division Multiplexing（PDM） systems,two beams of polarized mutually orthogonal light can be disturbed in transmission owing to polarization mode dispersion,polarization coupling and other factors,resulting in crosstalk.In this case,the Independent Component Analysis（ICA） algorithm based on minimized mutual information is applied to the separation of the mixed output signals of the system.The simulation results indicate that the original signals can be effectively separated without any priori information.关键词：PDM;signal separation;ICA;mutual information
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发布时间： - 摘要：On the basis of rate equations for semiconductor lasers,an expression for the modulation characteristics of the external light injected laser source is derived by employing a small-signal analysis model,Then the expression is coded by Matlab to customize an optically injected source component for the optical simulation tool Optiwave System and the self-defined component is included in a simulation model of multi-channel transmission to evaluate the impacts of the external light injection on the transmission performances of Radio over Fiber（RoF） systems.Simulation results show that external light ejection is conducive to reducing the disturbances caused by inter-modulation distortion and improving the system performance.The impacts are still more obvious for multi-channel microwave signals at above relaxation oscillation frequencies.关键词：RoF;rate equation;multi-channel transmission;external light injection
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发布时间： - 摘要：In order to avoid local optimum site selection for the Single Frequency Network（SFN） of terrestrial digital television,this paper applies the simulated annealing algorithm in the selection process and proposes a simulated annealing-based site selection algorithm for the SFN.By combining this algorithm with the topographic factors,it optimizes the configuration probability in receiving poor site selections so that it is possible to decide whether or not it can accelerate the operation according to terrain conditions.Furthermore,it conducts a secondary development on the basis of the professional software NGRadioPlan.Simulation results show that this algorithm can effectively carry out site selection.关键词：SFN;terrestrial digital TV;simulated annealing;site selection
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发布时间： - 摘要：In order to realize laser alarming systems with high anti-jamming property and wide field of view,this paper proposes a design scheme for the optical probe by applying tapered fibers.It implements the photovoltaic conversion by the direct coupling of a tapered fiber with a photodiode and indicates the energy of the incident light by measuring the voltage value.It analyzes the selection of the angle of the tapered fiber and the received fiber energy and conducts the relevant experiments according to the alarming system design requirements.The experimental data show that this method can amplify the detection field of the alarming system.关键词：laser alarming;multi-window detection;tapered fiber
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发布时间： - 摘要：Focusing fiber lenses are widely used in the photoelectronic imaging technique.In order to quickly calculate their imaging features and draw light paths,the imaging simulation software for those focusing fiber lenses with parabolic refractivity distribution is developed on the basis of MATLAB When the basic parameters of the fiber and object are input,the software can quickly calculate the fiber characteristic constant,focal length,image distance,image height and linear multiplying factor,and accurately draw the imaging light path.This work is conducive to the study and design of fiber imaging and to the teaching of photoelectronics techniques.关键词：focusing fiber lens;imaging;MATLAB software
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发布时间： - 摘要：This paper systematically studies the feasibility of integrating Brillouin Optical Time-Domain Analysis（BOTDA） equipment control system on the current Electric Fiber Optical Monitor System（EFOMS） and the relevant scheme design and improves the functions and structures of the EFOMS monitoring center and stations in accordance with the scheme to form a new generation of EFOMS specially for electric power,which provides for the analysis and measurement of stress and temperature as compared with the normal EFOMS.This is of great significance to cable analysis.关键词：BOTDA;EFOMS;OTDR;stress;temperature
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发布时间： - 摘要：<正>近日,《光通信研究》编辑部收到《中文核心期刊要目总览》2011年版编委会通知:《光通信研究》已入编《中文核心期刊要目总览》2011年版（即第六版）之电子技术、通信技术类的核心期刊。这是该杂志再次入选
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发布时间： - 摘要：<正>近日,烽火通信对外宣布,在中国电信组织的国内首次100Gbit/s系统测试中,烽火通信率先完成全部测试项目,表现出强大的技术优势。这充分显示出烽火通信在下一代高速传输领域的行业领先地位。
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发布时间： - 摘要：In this paper,we propose a volume grating parameter-optimized model for fiber laser spectral combining.Simulation results show that with the increase of the spatial frequency and refractive index modulation of the volume grating,the spectral width of the beam that it allows decreases and the beam divergence increases.On the basis of the proposed model,we optimize the spatial frequency and refractive index modulation and calculate and analyze the combining efficiency by using the optimized grating parameters.Our calculation shows that the efficiency is raised to over 95%.关键词：spectral beam combining;reflecting volume grating;grating parameter;diffraction efficiency
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发布时间： - 摘要：This paper presents an overview of the theories and several commonly used manufacturing processes for lithium niobate waveguides,including out-diffusion of lithium oxide from the crystal surface,in-diffusion of metals,iron exchange and proton exchange,and analyzes,compares and summarizes the effects of different processes on the performances of the waveguides.At the present,Ti diffusion and proton exchange are the main channels for achieving high quality lithium niobate waveguides.In addition,it introduces the theoretical correlation between the optical properties and structural characteristics of lithium niobate waveguides gradually built up in recent studies.关键词：Lithium niobate;optical waveguide;Process
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发布时间： - 摘要：The introduction of rapid wavelength locking mechanism can effectively compensate thermally-induced wavelength jittering in the process of the dynamic wavelength switching of the monolithic DBR tunable semiconductor laser and enhance its dynamic performance.This paper compares the features and performances of various wavelength locking approaches for such lasers,summarizes the latest research advances in this field and analyzes and looks forward to the relevant trend of development.关键词：tunable semiconductor laser;dynamic wavelength switching;wavelength locking
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- 208
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发布时间： - 摘要：A Photonic Crystal Fiber（PCF） sensor for cascaded Long Period Grating（LPG） is designed on the basis of its coupling effect and its strain sensing characteristics studied.Analysis is made of the impacts of strain on the interference spectrum of the cascaded LPG and the relationship between the strain and the interference peak is calculated,the result of which shows that this structure has a fairly high sensitivity and good linear relationship.关键词：PCF;LPG;interference;strain sensing
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- 106
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发布时间： - 摘要：In order to study the impact of the filled medium on the cutoff characteristics of ridged waveguides,this paper calculates the variations of the cutoff characteristics of dielectric loaded trapezoid symmetric double-ridge waveguides in the TE mode with the geometric dimensions by using the FDTD method,and gives their relation curve.The results show that the smaller the ridge gap,the greater the relative dielectric constant of the filled medium and the longer the cutoff wavelength,the narrower the single mode bandwidth.These results enrich the existing data of dielectric loaded waveguides and contribute to their design and engineering applications.关键词：FDTD method;cutoff characteristics;dielectric loaded waveguide;cut-off wavelength;single-mode bandwidth
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发布时间： - 摘要：A novel tunable external-cavity semiconductor laser structure is presented in this paper,in which an MEMS-based Tunable Optical Filter（TOF） and a silicon etlon are used as the wavelength selection components and a Liquid Crystal（LC） cell as the phase compensation element and a planar reflector to provide feedback.A laser sample in this structure is developed.The experimental results show that its output power and side mode suppression ratio are >10 dBm and >50 dB respectively,its tuning range is as high as 7 nm and its linewidth about 200 kHz.关键词：MEMS TOF;tunable external cavity laser;etalon
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- 149
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发布时间： - 摘要：This paper introduces the basic working principles of 10 Gbit/s Small Form-Factor Pluggable Transceiver（XFP） applied in SONET systems and describes the design of the optical transceiver modules that conforms to the relevant standards.Comparing with the conventional design,this module reduces both the cost and complexity of the design thanks to the adoption of the main chip GN2010EA,on which bi-directional CDR,APC and LA and laser driver are integrated.The test results show that this module can emit light with stable optical power and extinction ratio over a wide range of temperature.Furthermore,its parameters satisfy the requirements of ITU-T standard and meet the design requirements for 10 Gbit/s XFP modules.关键词：10 Gbit/s XFP;APC;optical power;extinction ratio
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发布时间： - 摘要：Laser Diode Driver（LDD） is a critical part of Small Form factor Pluggable（SFP） optical modules.The voltage margin sufficiency of LDD modulator determines if optical modules can work normally and their performances satisfy the requirements.This paper studies the influences of DC and AC coupling modes between VCSEL and LDD on the voltage margin of LDD modulator.The experimental results indicate that when AC-coupling mode is adopted,voltage margin insufficiency can be effectively avoided.This result is valuable for the design of SFP optical modules using VCSEL.关键词：SFP optical module;VCSEL;voltage margin;coupling mode
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发布时间： - 摘要：Using ZEMAX software,the coupling efficiencies between laser chip and fiber at different offsets are simulated and experimentally verified.The results show that when the chip offset is 100 μm,the coupling efficiency between the TO-CAN with 6.5 mm focal length and 8 ° fiber is the maximum: the simulation value is 21.9% and the experimental value is 21.32%,and when the chip offset is 80 μm,the coupling efficiency between TO-CAN with 5.8 mm focal length and 6 ° fiber is the maximum: the simulation value is 11.2% and the experimental value is 10.42%.In both cases,the experimental results are consistent with the simulation results,which has a certain guiding significance to laser subassembly packaging.关键词：Fabry-Perot laser;TO-CAN;coupling efficiency;chip offset;fiber
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- 147
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发布时间： - 摘要：This paper describes the network architecture of LTE systems.On this basis,it designs the setup of the dedicated bearer in the process of the Packet Data Network（PDN） connection establishment and tests and simulates the implementation of the established dedicated bearer with the Standard Description Language（SDL） and Tree and Tabular Combined Notation（TTCN）,generating its Message Sequence Chart（MSC）.Then,it compares the simulation results with the protocol specifications for conformance verifitcation.This test procedure has been applied to the development of LTE wireless integrated test instruments.关键词：dedicated bearer;conformance testing;TFT;QoS;LTE
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发布时间： - 摘要：Frequency offset estimation is one of the major modules of the receiving end in a Frequency Division Duplex-Long Term Evolution（FDD-LTE） system.This paper introduces the generation principle of the uplink channel demodulation reference signals and the way of their time-frequency location mapping.On the basis of the hardware performance estimation,it presents an implementation scheme for the Physical Uplink Shared Channel（PUSCH） frequency estimation by using the pilot-frequency-based residual frequency offset estimation algorithm.The analysis of the complexity of its implementation and the fixed-point computation errors shows that this scheme has fairly good performance and can satisfy the requirements of real-time processing.关键词：demodulation reference signal;FDD-LTE;frequency offset estimation;DSP
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发布时间： - 摘要：This paper proposes an initial beacon acquisition method for Free Space Optical（FSO） communications ATP systems on the basis of GPS coordinate calculation and cellular spiral scanning algorithm.It first calculates the azimuth angle and pitch angle of the optical antenna on the basis of the GPS coordinates of both terminals and the antenna rotates accordingly and points to the beacon light approximately so as to minimize the uncertain acquisition regions.Then it scans the regions and leads the beacon light into the coarse tracking Charge-coupled Device（CCD） field of view,realizing the initial acquisition.Ground beacon acquiring experiments verify the effectiveness of this method.关键词：GPS;spiral scanning;uncertain region;acquisition
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发布时间： - 摘要：<正>1、内容要求本刊主要刊登通信领域内的学术和技术类文章,主要内容包括通信网络、通信系统、无线通信系统、光纤光缆、光器件、技术应用等。其特点是"前沿学科"与"基础研究"相结合;"核心技术"与"支撑技术"相结合。2、格式要求
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