最新刊期
卷 ， 期 4 ， 2011
- 摘要：It is of major importance to study ONT Management and Control Interface（OMCI） protocol for the realization of the GPON network management system.This paper first introduces the GPON network management system and analyzes the G.984.4 OMCI protocol.Then,it studies and designs the OMCI-based N∶MP management and configuration model.Finally,it describes the realization scheme for the unicast data service configuration model and presents an improved model to resolve the defects of the original configuration model,which is of important value of reference for improving the interoperability of the equipment from multiple manufacturers.关键词：GPON;OMCI;Managed Entity（ME）;service management
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发布时间： - 摘要：HPON increases access bandwidth by using the wavelength division multiplex technology.But the point-to-point topology of its RN affects the multicast replication.This paper presents an HPON-based multicast implementation scheme and enhances its efficiency using Single-Copy Broadcast（SCB）.And then it improves the functions and structures of the original OLT,RN and ONU,implementing the control of the multicast stream.Finally,it conducts comparison tests on the multicast performances of the system before and after the improvement.The results indicate that the design can improve the multicast performance of HPON.关键词：HPON;WDM;TDM;multicast;OLT;ONU
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- 37
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发布时间： - 摘要：In this paper,the fundamental principle of optical module burst-mode BER tests is described.Based on the characteristics of the upstream data in GPON systems,a novel method and the key technologies for the extraction of burst data are presented and the logic block diagram and time schedule diagrams and circuits for implementing the tests designed.The GPON OLT optical module is tested with this testing system and the results show that this system is featured in simple operation and high reliability and meet the requirements for the test of GPON OLT optical modules.关键词：GPON OLT;burst-mode receiver;preamble bit;dynamic range
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- 86
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发布时间： - 摘要：On the basis of analyzing the fundamental principle of the PSNRZ code,this paper presents a signal phase pre-modulation method using the MZ modulator,which can easily and effectively regulate the format and value of the signal initial chirp.It points out that modulation depth can more visually reflect the chirp value of the PSNRZ code and derives the relationship between the modulation depth and the link residual dispersion.Finally,it simulates and analyzes the performances of the code in 40 Gbit/s communication systems,which indicates that PSNRZ code can increase the system dispersion tolerance to 180 ps/nm,thus greatly reducing the effects of dispersion on the communication systems.关键词：PSNRZ code;chirp;modulation depth;dispersion tolerance
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- 43
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发布时间： - 摘要：The existing PON protection scheme covers only the optical path between the PON MAC of OLT and the PON MAC of ONU,but not the entire OLT equipment.This paper introduces a new protection solution,which covers the whole OLT equipment.In this new solution,ONU is registered with two OLT equipments at the same time and such information as configuration and status are periodically synchronized between the two OLT’s by means of TCP communication.关键词：PON;protect switch;configuration synchronization
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- 109
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发布时间： - 摘要：This paper first explains the principle of the Channelized Tunable Optical Dispersion Compensator（CTODC） and reviews the latest progress in CTODCs based on Micro Electro-Mechanical System（MEMS） and Liquid-Crystal on Silicon（LCOS）.Then it analyzes and compares their mechanisms,configurations and key performance parameters and points out the key technologies and existing problems.Finally,it discusses the trend of the development of CTODCs in future high speed dynamic all-optical networks.关键词：tunable dispersion compensator;LCOS;MEMS;AWG
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- 125
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- 3
发布时间： - 摘要：This paper presents a Micro Electro Mechanical Systems（MEMS）-based Tunable Optical Filter（TOF）,analyzes its fundamental principle and optical structure and works out a rational design,which is verified in experiments.The results indicate that it is characteristic of small volume,low cost and large range of wavelength tuning.Moreover,it can realize narrowband filtering,extensively applicable in the flied of optical communication and filtering.关键词：MEMS;grating;tunable optical filter
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- 218
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发布时间： - 摘要：On the basis of the coupled theory of local normal optical waveguide modes,we design a Planar Lightwave Circuit（PLC）-type tapered adiabatic coupler with discretionary power dividing ratio for 1.550 μm wavelength.Then,we conduct simulation in Beam Propagation Method（BPM） and analyze its performances when the dividing ratio is 50/50,20/80 or 5/95.The results show that this coupler can realize arbitrary dividing ratios when the coupled length is in the range of 15 mm.Compared with the PLC-type directional coupler,this coupler has larger bandwidth and process tolerance,so easier to be manufactured.关键词：adiabatic coupler;local normal mode;discretionary power dividing ratio;process tolerance.
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发布时间： - 摘要：This paper first analyzes the key issues of the L-band EDFA and simulates and analyzes its characteristics and several light-path structures.And then,on this basis,it presents a 3-stage cascade gain tunable light-path structure and gives the test results,which shows that we can achieve L-band gain tunable EDFA with high and flattened gain and low noise index by employing rational light-path structures.关键词：L-band;gain tunable;noise figure;variable optical attenuator
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- 79
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发布时间： - 摘要：This paper introduces a novel array optical switch based on piezoelectric ceramics and the micro-fluidic control technology,with a focus on the optical power loss of its waveguide layer.It analyzes and simulates the coupling loss of the waveguide layer using Opti-FIBER and experimentally measures the coupling losses in different conditions.The results show that this switch has such advantages as simple structure,fast response,100 μs,and low loss,minimum theoretic insertion loss 0.042 524 dB.关键词：optical switch;numerical analysis;micro-fluidic control technology;optical coupling loss
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- 175
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发布时间： - 摘要：In this paper,the characteristics of Fiber Bragg Grating（FBG） nonlinear bistable switching are numerically simulated and studied.On the basis of the coupled-mode theory,three different solutions are obtained by using the Jacobi elliptic function.First,the nonlinear bistable switch characteristics in three solutions are compared respectively.Then such parameters as detuning,coupling coefficient and grating length that affect the switching characteristics in each solution are analyzed.The results have certain significance to the analysis and construction of nonlinear bistable FBG optical switches.关键词：fiber grating;nonlinearity;Jacobi elliptic function;bistable;optical switch
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- 110
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发布时间： - 摘要：This article introduces an optical transceiver module that integrates the functions of transmitting and receiving data and video signals.The module is composed of single fiber triplexer subassembly,the corresponding driver,amplifier,and control circuits,realizing the conversion of voice,data and video services in the physical layer.The module is tested according to the relevant standards and the results indicate that the transceiver meets the application requirements for triple play.关键词：EPON single fiber triplexer transceiver;FTTH;triple play
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- 108
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发布时间： - 摘要：When the chirped grating axial temperature gradient is changed,its reflection wavelengths in different positions in the non-periodic grating axis will change accordingly,thus altering the chirp of the grating and achieving the purpose of regulating the dispersion.In this paper,a Fiber Bragg Grating（FBG）-based Tunable Optical Dispersion Compensator（TODC） with positive and negative dispersions is designed and implemented with its adjustment range up to-900700 ps/nm.This design is characteristic of no mechanical adjustment device,long working life and high reliability.关键词：FBG;dispersion;TODC;optic transmission;optical communication
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发布时间： - 摘要：On the basis of the Kogelnik’s coupled-wave theory,the diffraction efficiency equation of transmitting Volume Body Grating（VBG） is derived.The dependence of the angle and wavelength selectivity of the VBG on the refractive index modulation and crystal thickness are analyzed by numerical simulation.The results indicate that when the incident light satisfies the Bragg condition,the refractive efficiency of a 2-mm-thick VBG with a 250×10-6 refractive index modulation is 100%,while when the incident light deviates the Bragg condition for a very small quantity,the VBG diffraction efficiency drops rapidly and when the deviation quantity surpasses a certain scope,the diffraction efficiency reduces to zero.关键词：transmitting VBG;coupled wave theory;displacement;diffraction efficiency
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- 263
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发布时间： - 摘要：In this paper,a 2-dimensional bent photonic crystal waveguide structure with a Photonic Crystal Ring Resonator（PCRR） is presented.The transmission performances of the electromagnetic waves in such structures with a 3×3 PCRR and a 4×4 PCRR respectively are studied by using the finite-difference time-domain method and the propagation performances of the entire dielectric rods with three different dielectric constants analyzed.The results show that electromagnetic wave propagations can be realized with low losses in such waveguides with PCRR and,as characteristic of broad bandwidth and compact structure,this structure is potentially applicable in manufacturing optical communication devices and photonic crystal integration.关键词：photonic crystal;bent waveguide;ring resonator;broad bandwidth
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- 76
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发布时间： - 摘要：The stability of Photonic Crystal Fiber（PCF） sensors is of utmost importance in practical engineering applications.In this paper,the PCF pressure sensor model is derived in accordance with the elasto-optical theory,its system composition presented,and the variations of the system in relation to the optical source wavelength variations,output signal light intensity fluctuations and the ambient temperature stability theoretically analyzed.The fluctuations of its output power,wavelength,sensitive unit length and ambient temperature all exert impacts on the stability of the entire sensor system.关键词：fiber and waveguide optics;PCF;PCF sensor;stability
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- 265
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发布时间： - 摘要：On the basis of the optical repeating and sensing technology,a novel ultra-long range optical fiber Raman temperature sensor solution is presented in this paper.The multistage optical repeating/amplifying/sensing devices are embedded among multiple sections of sensing optical cables of the sensor and the Raman scattering light from the fiber is intensified as the fiber loss is overcome by the gain of the devices.The cables are measured in sections and time.When the sensing cables are cascaded by introducing N such devices among multiple sections of the cables,N×L（L refers to the length of each piece of sensing fiber） ultra long-range monitoring of the sensor can be realized.The practical measurement results show that sensing signals with fairly high SNR can be obtained in a sensing and detecting range of 60 km.关键词：distributed optical fiber Raman temperature sensor;ultra-range;optical repeating and sensing technology
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- 280
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发布时间： - 摘要：As the protocol conformance testing is important in protocol implementation,the TD-LTE wireless terminal tester must be designed in accordance with the protocol specifications.This paper presents a testing method based on the Specification and Description Language（SDL） and the Tree Tabular Combine Notation（TTCN） for the testing and simulation of EPS Mobility Management（EMM） of the enhanced packet systems.This method is verified with the ARM1176JZF-S chip in an ARM Workbench IDE environment and is optimized.关键词：conformance testing;EMM;protocol stack;SDL;TTCN
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发布时间： - 摘要：Iub interface is one of the most important network interfaces in 3G radio access networks.In view of the transmission of the Iub interface and the insufficiency of the existing Iub interface data acquisition card,this paper designs a modular channelized data acquisition card,and presents a multiplexin/demultiplexing method for STM-1/E1’ on the basis of space/time division switching and a scanning unit/index-based automatic IMA-acquisition group binding algorithm.Tests and application results show that this card has higher flexibility and compatibility.关键词：Iub interface;channelized;multiplexing and demultiplexing;IMA group binding
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发布时间： - 摘要：For the purpose of increasing the bandwidth efficiency of the multi-user cyclic prefix convolutional spreading CS-CDMA/CP system in the condition of multi-user interference,an Iterative Partial Multi-User Detection（IPMUD） algorithm is proposed.In this paper,the influence of the detection interference of the interfering user on the desired user is explained by using the density evolution analysis approach.It can be seen from the analysis that the accuracy of the interfering user detection is essential for the desired user detection.Therefore,some modifications are made to IPMUD,e.g.: widening the detection window or abandoning the some rather bad iterative detection of the interfering users.The modified algorithm can offer better tradeoff between the system performance and detector complexity.关键词：CS-CDMA system;multi-user interference;IPMUD;density evolution analysis;multipath channel
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