最新刊期
卷 ， 期 1 ， 2009
- 摘要：The deployments of monolithic integrated tunable laser diode bring great flexibility,scalability and cost effectiveness for optical fiber communication systems and agile optical networks.In this paper,different monolithic integrated tunable laser diodes are reviewed with emphasis on the tuning mechanism,device structure and performance comparison.The recent development progresses and future trend are summarized.关键词：photonic integrated circuit;tunable laser diode;DWDM;agile optical network
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- 484
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- 2
发布时间： - 摘要：In this paper,a Tunable Dispersion Compensation（TDC） scheme for 40 Gbit/s WDM systems is introduced.In this scheme,high-accuracy dispersion compensation can be made for the existing 40 Gbit/s WDM system with the principal modulation and encoding formats by using the CFBG-based multi-channel dispersion compensation technology and the EDFA-based automatic power control technology.At the same time,the dynamic range of the receivers is improved.关键词：FBG;WDM;TDC
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- 179
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发布时间： - 摘要：This paper introduces the structure of Transport Multi-Protocol Label Switching（T-MPLS） over Optical Transport Networks（OTN） and analyses the types of algorithms for the problems involved in the T-MPLS-based Routing and Wavelength Assignment（RWA）.Then,it divides them into two sub-problems,concerning routing and wavelength assignment respectively,and studies them in respect of supporting traffic engineering,multi-domain,multicast and Diff-Serv on the basis of the characteristics of T-MPLS technology.关键词：RWA;T-MPLS;OTN;routing;wavelength assignment
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- 157
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发布时间： - 摘要：Transport networks are evolving from the traditional optical networks into the intelligent optical networks.This paper proposes the concept of "Generalized Survivable Dynamic ASON",which meets the requirements for non-blocking dynamic bandwidth provisioning and full survivability in case of any network failures,discusses the arithmetic algorithm model for meeting the above requirements and describes the network capacity planning.关键词：ASON;full protection;full survivability;non-blocking;dynamic bandwidth provisioning;capacity planning
- 2
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- 60
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发布时间： - 摘要：On the basis of amelioration of an existing wavelength converter assignment algorithm called subgraph + ADD by using big degree node first heuristic idea,a new algorithm called subgraph + BDF is obtained by using big degree node first heuristic idea.The computer simulation results show that the new algorithm effectively reduces the time complexity in operations while retaining the accuracy of the results.关键词：WDM;wavelength converter;subgraph;ADD
- 2
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- 107
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- 1
发布时间： - 摘要：As the demand of the network users for network availability is increasingly higher,to evaluate and quantify network availability has become a major research subject.This paper analyzes the general protection mechanisms for ASON and provides for each of them an algebraic formula for the availability analysis.It verifies the validity of the availability model by calculation examples,analyzes the relationship between the availability of the protection mechanisms and the relevant network parameters and makes comparisons between the availability degrees brought about by various protection mechanisms.关键词：protection mechanism;link failure;system availability;ASON
- 2
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- 84
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- 3
发布时间： - 摘要：Quasi-Cyclic Low-Density Parity-Check（QC-LDPC） code can bring about higher coding gain for fiber-optic communication systems,but the computation of Log-Likelihood Ratio（LLR） in the decoding process is very complicated.To reduce the complexity of the decoder hardware design,this paper introduces a simplified LLR algorithm in fiber channels.The simulation results show that this algorithm is subject to a decoding performance loss of only 0.05 dB compared with the original one.关键词：fiber optic communication;LDPC;iterative decoding;decoder
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- 164
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- 1
发布时间： - 摘要：As the extension of an operator network,the home network is the last link of its service delivery process,so it must have its characteristics,i.e.stable performances,manageability,maintainability,ensured QoS,security and extensibility.In this paper,an EPON-based remote management framework of home network is presented on the basis of the latest access network technology EPON and the remote network management protocol TR-069 addressed on the DSL forum.关键词：home network;EPON;remote network management
- 2
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- 162
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- 5
发布时间： - 摘要：Security and charging management have major significance to the carrier-level operation and large-scale commercial applications of EPON.Authentication is a key technology for the implementation of security and charging management.In this paper,in compliance with of IEEE802.1x standard and the RADIUS protocol,a design for the authentication mechanism for the EPON system is presented and the RADIUS client-end functions realized by developing the agent of the net-snmp software package on the Linux system.关键词：EPON;RADIUS;PAE;SNMP
- 2
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- 80
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- 2
发布时间： - 摘要：Along with the further development of fiber-optic access,it will be an inevitable trend for xDSL to evolve into FTTx and fiber access networks will become the main carriers between MAN/SS and home gateway/IAD.As a new generation optical network access technology,EPON access is one of the key techniques for realizing FTTx.This paper briefly discusses the EPON network system and its work principle,with the focus on the way of implementation of EPON technology in carrier networks,and points out the problems in this process.Finally,it predicts the prospects of the development of EPON technology.关键词：EPON;LLID;VLAN;OLT
- 2
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- 326
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- 29
发布时间： - 摘要：In this paper,the basic principle of the codec of the Adaptive Differential Pulse Code Modulation（ADPCM） technology and the Pulse Width Modulation（PWM） technology are introduced,the realization of the ADPCM speech decoding algorithm by using the finite state machine on FPGA studied and the decoded digital speech signals transformed into Pulse Width Modulation（PWM） waves by using the PWM technology so as to directly drive the horn to make sound.The quality of speech synthesis output is good.关键词：FPGA;ADPCM;speech decoder;PWM;state machine
- 2
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- 319
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- 1
发布时间： - 摘要：A simplified look-up table-based 64B/66B codec scheme possibly used in 100G Ethernet is proposed,designed and realized.The look-up table is simplified by the codec and parallel processing and pipelining are used in the programming.The test results indicate that this codec is characteristic of high speed and strong reliability and meets the requirements for high speed data processing.关键词：100G Ethernet;encoder;decoder
- 3
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- 241
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- 7
发布时间： - 摘要：All-optical telecommunication technology is currently a research focus and all-optical buffers and high-speed optical switches are two of its essential conditions.As it is necessary to reduce the light speed if all-optical buffers are to be realized,this paper first summarizes the evolution of slow light technologies both at home and abroad and then describes the research on fiber slow light technology and its applications in high-rate all-optical telecommunications.Finally,it presents the difficulties in current researches on slow light in optical fibers and the strategic significance of these researches to all-optical telecommunication technologies.关键词：slow light;all-optical telecommunication;optical fiber;photonic crystal fiber
- 3
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- 803
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- 14
发布时间： - 摘要：In order to make a more visual and convenient study of the transmission of optical pulses in optical fibers under the interactions among various factors,we design a software for the simulation of optical pulse transmission with Matlab on the basis of the solution of the extended nonlinear Schrodinger equation.With a visual graphic interface,this software can be used in relevant simulations and teaching experimental demonstrations of pulse transmissions,having satisfactory application values.关键词：nonlinear Schrodinger equation;symmetrical spilt-step Fourier;ultra-short pulse;software simulation
- 2
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- 223
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- 3
发布时间： - 摘要：In this paper,a scheme for removing the shift of bias control points is presented on the basis of analyzing the principle and process of the shift and the automatic switchover of the control mode can be realized for the bias control in the conventional mode by increasing the Multipoint Control Units（MCU）.At the same time,the digitalized bias control voltage enables the bias control to be more accurate and stable.关键词：MCU;bias;bias control
- 5
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- 155
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- 2
发布时间： - 摘要：In this paper,the structural principle and dispersion-tolerance performance of the optical duobinary encoding technology are introduced and analyzed and the general principle of the Electronic Dispersion Compensation（EDC） technology studied.The results in a 220 km-long G.652 fiber transmission experiment indicate the feasibility of constructing 10 Gbit/s fiber-optic transmission systems without optical dispersion compensation links by using the optical duobinary encoding and EDC technology.关键词：duobinary encoding;EDC;fiber-optic transmission
- 2
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- 143
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- 5
发布时间： - 摘要：This paper first discusses the transmission of fiber mode field with absorption and then explores the absorption of the pumped light through a concentric-circle-shaped inner cladding.In order to clarify the amplification mechanism for the double-clad Polymer Optical Fiber Amplifier（POFA）,it sets up a numerical model by using the numerical analysis and other methods and analyzes the amplification process and gain characteristics,and calculates the pump absorption coefficient by using the average value and specific function.In addition,it performs the theoretical analysis of the results of the respective acquired gain characteristics.The experimental data and results testify to the feasibility of this method.关键词：POFA;gain;concentric circle;absorption coefficient
- 3
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- 116
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- 0
发布时间： - 摘要：In this paper,the development of a 1.25 Gbit/s transceiver module based on Chinese-made ICs is introduced.The principles for the automatic control of transmitter optical power and extinction ratio are proved by calculations and inference and the design of the receiver sensitivity discussed.The designed module specimen is fully tested,which shows that its performance parameters fully satisfy the requirements of fiber-optic communications and the product reliability is good enough for project applications.关键词：optic transceiver module;average optical power;extinction ratio;sensitivity
- 2
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- 145
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- 4
发布时间： - 摘要：The properties of Long Period Fiber Gratings（LPFG） are analyzed by applying the coupled-mode theory and the relationship between the physical parameters and the grating spectra obtained and simulated by using Matlab.Periodic rectangular pressure grooves with periods of 600,620 and 660 μm and period numbers of 60,80 and 90 are produced on the basis of the mechanical linear processing technology.The maximum resonant peak of the grating fabricated by using the mechanical micro-bending principle can be as high as 18 dB.The resonant wavelength is tunable and the transmission spectra are identical with the theoretical analysis.关键词：LPFG;coupled-mode theory;periodic pressure groove;micro-strain
- 2
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- 178
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- 2
发布时间： - 摘要：Photonic Crystal Fiber（PCF） sensors are widely used in various kinds of dynamic pressure measurements.In this paper,a PCF sensor for dynamic pressure measurement is designed,its pressure acting principle analyzed by using the differential balance method and its output signal detecting scheme discussed.The results indicate that its response to the external pressure is periodic and the response period is relevant to the external pressure and the length of its sensitive elements.关键词：fiber optics;PCF;PCF sensor;dynamic pressure measurement
- 3
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- 445
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- 3
发布时间： - 摘要：Mainly caused by frequency offsets,Inter-carrier Interference（ICI） disrupts the orthogonality between the sub-carriers in the Orthogonal Frequency Division Multiplexing（OFDM） system,greatly debasing the system performance,and in the high-rate mobile Wimax system,ICI caused by time-varying channels is even more not to be overlooked.In this paper,a PTS algorithm-based ICI cancellation technology is introduced into the mobile Wimax system and an optimized algorithm proposed in view of the computational complexity.System simulations in Matlab language prove that this algorithm is effective in the ICI cancellation for Wimax systems.关键词：OFDM;ICI;Wimax system;PTS
- 2
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- 69
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发布时间： - 摘要：Commonly existing in wireless repeater project site,space co-frequency interference can hardly be eliminated by the traditional RF filter technology in the frequency domain,resulting in self-excitation in the repeater.In this paper,a digitalized adaptive interference cancellation technology is applied to solve this problem with an effect equivalent to the improvement of the repeater space isolation degree by over 30 dB.关键词：digital repeater;interference cancellation;adaptive filtering
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- 196
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