最新刊期
卷 ， 期 6 ， 2005
- 摘要：In this paper,the up to date research progress of NGN architecture in some international standard organizations were introduced,and some possible evolution roadmap of next generation network was discussed, from softswitch to IMS,is the road of network to convergence.We gave some emphasis to the structure and function entities of the IP multimedia subsystem.关键词：next generation network（NGN）;IP multimedia subsystem;softswitch;network convergence
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发布时间： - 摘要：Firstly,we summarized the technical development trend of the optical transmission network in this paper.Secondly,we analyzed the main factors which influence the reliability and safety of optical transmission network;according to the familiar network model,from the equipments to the whole network system,and described the calculation process of the usability about optical transmission network in detail.Thirdly,we indicated the significance that build up the reliability and safety of optical transmission network with protection and recovering these two kinds of mechanisms.Finally we concluded the sensitivity of different factors which influence the optical transmission network,farther generalized the method which could carry out the different SLA of optical transmission network.关键词：optical transmission network;MSTP;ASON
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发布时间： - 摘要：Based on the challenge of ASON network management system,in this paper we propose the design criteria of an ASON network management system,and layed-based network management design scheme,detailedly analyse the functions of each layer of network management system and the interfaces design between layers.We focus on description of the analysis and design of routing module in the control plane.关键词：ASON;control plane;OXC;SNMP
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发布时间： - 摘要：Optical burst switching（OBS） is a potential technology to construct next generation all-optical networks,while its blocking performance becomes very poor in heavy load cases and network parameters are difficult to be designed.A novel time-slot optical burst switching networks architecture was intraduced in this paper.Based upon the comparison of conventional OBS networks,we present the mechanism of its control plane and corresponding functional units.The scheduling problem for network intermediate nodes was defined and slot assignment strategy was also discussed.Four on-line scheduling algorithms applied in network edge and core nodes are evaluated by simulation.关键词：optical burst switching（OBS）;time slot;scheduling algorithm;RWTA;WDM
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发布时间： - 摘要：This paper presented a systematic introduction to the relationship between the TMN architecture and the interface reference points of all layers of function,analyzed the short coming of the Q3 standard for EML-NML interface under the object-oriented distributed environment,and the superiority of CORBA over distributed application environment,The paper also elaborated on the application of CORBA technology in EML-NML interface,and a CORBA-based architecture for realization of EML norward interface under the transport network management platform,put forword a CORBA-based realization scheme for common EML-NML interface design.Lastly,the paper gave an overall operation scheme of TMN using ORBIX 6.1 as the realization platform.关键词：TMN;CORBA;EML-NML;interface
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发布时间： - 摘要：The research of high speed transmission system is a hot topic in the optical communication field and one of the key technologies is channel coding.The technology and the application of forward error correction（FEC） were introduced firstly,then the FEC frame defined in ITU-T G.709,and calculates the BER gain from FEC were described in this paper.Finally,the data which obtained form two FEC digital-wrapping chipsets test shows the relationship between BER and OSNR,and verifies the coding-gain from the FEC technology.关键词：channel coding technology;forward error correction（FEC）;coding-gain;bit error ratio（BER）;optical signal to noise ratio（OSNR）
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发布时间： - 摘要：With the receiver sensitivity requirements of EPON in IEEE Standard 802.3ah-2004,optical modulation amplitude（OMA） of EPON is analyzed.When receiver sensitivity is expressed in OMA,the requirement for extinction ratio（ER） become lowered,the designs of transmitter and receiver will be much easier.At last,measurements of OMA and stressed receiver sensitivity are discussed,and come to the conclusion that stressed conditioning measurement is more practical.关键词：EPON;receiver sensitivity;OMA;stressed receiver sensitivity;measurement
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发布时间： - 摘要：In this paper,we first briefly introduce the development of next generation network technologies and IETF QoS mechanisms,and summarize the limitations of current PON technologies on supporting end-to-end QoS,and then we propose the GMPLS-based passive optical network service model. By deploying GMPLS as the common control and management platform in optical access network,a unified QoS service model can be established for supporting of end-to-end QoS effectively.关键词：PON;GMPLS;IntServ;end-to-end QoS
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发布时间： - 摘要：As a branch application of high speed optical signal processing.The all-optical demultiplexing technology relates to many aspects of semiconductor non-linear optics and is one of the key technologies to realize the high-speed optical time-dividion multiplexing（OTDM） system.This paper gave a survey of current all-optical demultiplexing technologies,the principles of operation of two predominant technologies have been described in detail,their advantages and disadvantages were analyzed.The potential demultiplexing technology based on higher-speed optical switch was also introduced and the evolution route of all-optical demultiplexing technology discussed in this paper.关键词：optical time-division multiplexing（OTDM） systems;all-optical gate;demultiplexing
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- 319
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发布时间： - 摘要：Tower mounted amplifier is a utility technique in the field of mobile communication,it can augment the system’ s coverage,increase capability,solve the interfere of node B.Use tower mounted amplifier sufficiently is a good approach to utility resource,improve the network’ s quality and optimize the network.The paper introduces the element of tower mounted amplifier,analyzes the function and application of it for WCDMA system.关键词：tower mounted amplifier;noise figure;coverage and capability;gain
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发布时间： - 摘要：We present the design of an adaptive polarization mode dispersion compensator,it is fast and applied.The birefringent characteristic of x cut,y propagation LiNbO3 is used to compensate fiber PMD, power spectrum density works as feedback control signal,and multi-dimensional gradient searching algorithm optimize the value of compensation.关键词：polarization mode dispersion（PMD）;polarization mode dispersion compensator（PMDC）;LiNbO3;optical communication;differential group delay（DGD）
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发布时间： - 摘要：The Jones transfer matrix can be derived from the coupled nonlinear Schrdinger equation.Statistical characteristics of the first-order PMD are simulated by Jones transfer matrix method.And the propagation of light pulse with PMD is also simulated by solving the coupled nonlinear Schrdinger equation.关键词：polarization mode dispersion（PMD）;differential group delay（DGD）;Jones transfer matrix
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- 104
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发布时间： - 摘要：The structure and principle of polarization-dependence meter was described in this paper firstly.After that,the authors introduced some main structures of polarization control module including wave plate structure,VFR structure,birefringence wedgy crystal structure,optical fiber rings structure,pressing optical fiber structure,liquide crystal structure,LiNbO3 structure,electrooptic ceramic structure.At last,according to the development of optical communications,the authors analyzed the progress of some polarization-dependence meters.关键词：polarization-dependence meter;polarization control module;fiber birefraction;liquid crystal electrically controlled birefringence
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发布时间： - 摘要：Broadband refers to high capacity high speed（typically greater than 256 kbit/s in both direction）,Internet or network connections carried on coaxial or fiber optics cables with wider bandwidth than conventional copper telephone lines.Broadband channel can carry voice,video and data simultaneously.Broadband is available in number of different technologies.E.g. Copper using DSL technology,optical fiber technology using FTTH,cable TV network and wireless technology using WiFI and Wi-Max.The optical fiber technology for providing broadband services using FTTH networks i.e fiber to the last mile.Properties of ideal fiber used in metro and access networks to provide broadband services,and low water peak ITU T G.652D,due to its low attenuation at 1383±3 nm and low polarization mode dispersion（PMD）,meets and exceeds the requirement of ideal fiber in broadband network.关键词：cost effective;broadband;communication;ideal fiber
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发布时间： - 摘要：This paper will start with the review of RL index of related specification.The analysis and key point of high RL receiver module will be demonstrated next.Wuhan Telecommunication Devices Co.Ltd.,（WTD）’ s solution and it’s products will be introduced at the same time.The prototype test results demonstrate that the research work is successful.关键词：return loss;coaxial package;optical receiver module;2.5 Gbit/s;OC-48/STM-16;SONET/SDH
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发布时间： - 摘要：The cladding pumped technology and the laser based on it is demonstrated in this paper,At the same time,a new kind of pumped technology,i.e.side pumped technology is described also.Later on,the high power cladding fiber laser of our lab which is being tested is introduced.This laser generated up to 196 W of continuous-wave output power at 1.09 μm with 85% slope efficiency and a good beam quality by end-pumped technology when the laser is pumped at 240 W.关键词：D-shape cladding fiber;double cladding fiber;cladding pump
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- 176
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发布时间： - 摘要：A transimpedance preamplifier with AGG using CMOS process in optical receiver is introduced in this article.It operations under 3.3 V,simulations with 0.25 μm CMOS process.Its transimpedance gain is 76 kΩ when input signal is faintness and single ended output voltage is 281 mV when input signal is 0 dBm.关键词：automatic gain control circuit（AGC）;transimpedance preamplifier;transimpedance gain
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- 384
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发布时间： - 摘要：A novel broad-band EDFA employ a tri-port gain flattening filter（GFF） module is proposed in this paper.The new design of the EDFA with a novel setup on topology and which is different form the conventional parallel or serial topology setup.The simulation shows that the novel setup can save more than 48% EDF and improve more than 55% pump efficiency in L-band than which in the conventional EDFA while the C-band EDFA’ s properties is remained.In the experiment,we used two 980 nm pump LD with the pump power at 106.9 mW and 109.6 mW,respectively.And the two segment EDF in C-band had the length of 8.5 m and 9.6 m.In L-band we set the output power of the only one 1 480 nm pump LD at 80 mW,and the length of the L-band EDF is 19.8 m.The experiment on the novel EDFA got a result with more than 23 dB gain and less than 0.6 dB gain flattening in C+L-band.While the noise figure is less than 4.4 dB in C-band and 5.6 dB in L-band.关键词：broad-band EDFA;gain flattening filter（GFF）;power conversion efficiency（PCE）;noise figure（NF）
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发布时间： - 摘要：The realization of a kind of all-optical wavelength router that is controlled by electrom was described in this paper.At first the structure and the working principle of this device was introduced.Afterwards according to the two main components of this system,it introduces the original design of the optical cross-matrix and the realization of the corresponding control system were introduced.The working principle of the control system was discussed in detail and then the design philosophy was brought forward.At last the test result of the prototype was showed.关键词：all-optical wavelength router;optical crossmatrix;embedded system;control circuit
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发布时间： - 摘要：Based on the summarized of the main characteristics of active mode-locked fiber ring laser,three schemes to perform the technology,including active mode-locked fiber ring laser using modulator,active mode locked fiber ring laser with LD as a modulator,injecting active mode-locked fiber ring laser are introduced in this paper.The new development of rational harmonic mode-locked laser,multiwavelength active mode-locked laser and fiber ring laser with photonic crystal fiber are discussed.At the same time,the key research field of active mode-locked fiber ring laser is refered.关键词：active mode-locked;modulate;Erbium-doped fiber
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