最新刊期
卷 ， 期 6 ， 2017
- 摘要：Optical systems and networks are important infrastructures to support information society.In the Big Data era,the emerging applications such as cloud computing,mobile interconnection,and virtual reality demand an ever-increasing capacity of information transportation.To meet this requirement,optical fiber transmission technology keeps the developing towards highspeed and large capacity.In this paper,we introduce the main recent advances in high-speed optical fiber transmission and discuss some enabling technologies of coherent detection for long haul transmission and direct detection for medium and short distance transmission.Some new technologies are summarized and a perspective is presented for high baud rate optical fiber transmission.关键词：high-speed optical transmission;coherent detection;direct-detection;nonlinear compensation;probabilistic shaping
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发布时间： - 摘要：Spatial Division Multiplexing（SDM）using either few-mode or multi-core fiber is regarded as one of potential solutions to solve future capacity crunch of traditional Standard Single Mode Fiber（SSMF）.Meanwhile,thanks to the successful development of some critical SDM device,SDM technique can also be applied for distributed fiber optical sensor with multiple parameters simultaneous monitoring,in order to solve the cross sensitivity of traditional SSMF-based fiber sensor with single parameter monitoring.We review recent progress of few-mode fibers,multi-core fibers,multi-core few-mode fibers,in term of design,fabrication and characterization.Moreover,recent progress of those specialty fibers for SDM transmission and fiber sensor applications are presented.Finally,the prospect of the transmission and sensing applications using either few-mode or multi-core fiber are summarized.关键词：few-mode fiber;multi-core fiber;spatial division multiplexing;fiber sensor
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发布时间： - 摘要：Traditional optical access network cannot satisfy the fast capacity increasing requirements in current Internet.In this paper,considering the development of Passive Optical Network（PON）technologies in Optical Access Networks（OANs）,we introduce three mainstream technologies to upgrade the capacity in OANs to achieve single-wavelength 25 Gbit/s transmission,single-wavelength 50 Gbit/s transmission and coherent optical detection.Both the advantages and disadvantages of the three technologies are analyzed.We also briefly introduce our work in these three areas.关键词：passive optical network;optical access networks;coherent optical detection
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发布时间： - 摘要：With the development of intelligent terminals and Internet,the Wireless Local-Aarea Networks（WLAN）are becoming more and more popular worldwide,and have been the most-widely used broadband wireless access technology.The further development of WLAN technology is facing three problems in coverage,interference,and maintenance.The three problems can be effectively solved by combining WLAN and Radio-over-Fiber（ROF）technologies.Nevertheless,in the new-generation WLAN standards,2.4 and 5 GHz two operating frequency-bands are defined,and advanced Multi-Input Multi-Output（MIMO）technique is adopted.In addition,IEEE 802.11 n/ac standards significantly enhance the network throughput.All these new features pose stringent requirements and challenges.In this paper,our recent works are reviewed in threes aspects:digital nonlinear compensation in multi-band ROF systems,single-fiber transmission of wireless MIMO signals,and modeling in WLAN throughput performance.关键词：distributed antenna systems;WLAN;ROF;digital predistortion;MIMO;medium access control
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发布时间： - 摘要：This article discusses the potential issues and challenges for the upgradation and migration of the next-generation optical network,and proposes the strategies of tackling these.Due to the increasing bidirectional asymmetry of traffic flows,we propose to separate the pair of transmitter and receiver in each optical transponder to encapsulate them in independent modules.To support the smooth migration from the Dense Wavelength Division Multiplexing（DWDM）optical network to the flexiblespectrum optical network,we propose to employ the sub-band virtual concatenation technique to enable the transmission of super-channels in the DWDM network.We also discuss the strategies of using the new generation of colorless,directionless,contentionless,and gridless Reconfigurable Optical Add/Drop Multiplexer（ROADM）to replace old ROADM in the optical network.In addition,the issues on enabling the communications between the new and old generations of ROADMs is also discussed.Finally,considering the reality that a large amount of fibers would be replaced in the coming years,we consider the issues and strategies of replacing old single-mode fibers with the new large effective area and ultra-low loss fibers.关键词：optical network upgradation;optical network migration;bidirectional asymmetry of network traffic flows;sub-band virtual concatenation;ultra-low loss fibers;ROADM
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发布时间： - 摘要：In the interaction with the light field,metasurfaces show unique optical properties and many interesting physical phenomena.It is expected that the ability of manipulating the optical wave can be improved by using metasurfaces based optoelectronic devices.In this paper,a new type of optical power splitting scheme based on silicon-based metasurfaces is proposed in optical fiber communication system.The results show that the cross-polarization conversion efficiency with phase delay exceeds 90% while the useless co-polarization conversion efficiency can be compressed into 1.2% within wavelength range of 1 4581 593 nm by optimizing the unit nanostructure of the silicon-based metasurfaces.In addition,the coupling effect between the adjacent silicon nanobricks is studied in order to reduce their influences on the phase precision.Finally,four different optical power splitting patterns are realized and verified by simulations.The proposed optical power splitting technique based on metasurfaces has the advantages of compact size,high efficiency,polarization-state insensitive,broadband response,flexible design,and compatibility with semiconductor manufacturing process,which can achieve ultra-dense,arbitrary,and intelligent power distribution for the optical communications in the future.关键词：metasurfaces;optical power splitter;Gerchberg-Saxton algorithm;nanostructures
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发布时间： - 摘要：This paper reviews the research work of Artificial Neural Network（ANN）and Deep Neural Network（DNN）for extracting temperature distribution information in Brillouin Optical Time Domain Analyzer（BOTDA）sensing system.After proper training on ANN or DNN model,the Brillouin gain along the measured temperature distribution of optical fiber can be extracted from the Brillouin Gain Spectrum（BGS）,rather than the traditional Lorenz Curve Fitting（LCF）method which fits the BGS as Brillouin Frequency Shift（BFS）,and then convert it to the temperature information.The experimental results show the advantages of using ANN and DNN for temperature extraction compared with the traditional LCF method.关键词：temperature extraction;artificial neural network;deep neural network;Brillouin optical time domain analyzer
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发布时间： - 摘要：Multi-core fiber could significantly increase the transmission capacity of fiber transmission systems.However,due to the crosstalk among adjacent cores,there exists a larger challenge for the resource allocation in Elastic Optical Networks（EONs）with multi-core fibers.In this paper,the problem of the Routing,Spectrum and Core Allocation（RSCA）in EONs with multi-core fibers is analyzed.We establish an optimization model that considers the crosstalk among adjacent cores and minimizes the maximum sequence number of frequency slots occupied.To the best of our knowledge,an optimization algorithm based on co-evolution is proposed to solve the RSCA problem for the first time.In the proposed algorithm,the first strategy of the most requested service is used to sort the traffic demand in descending order,and then the different routing and core allocation populations with integer coding are set up.Combined with single point crossover and uniform mutation,the global optimal solution of the RSCA problem is searched by the differentiated elite reserve evolution strategy.The performance evaluation of the proposed algorithm is conducted on two different network topologies.Experimental results show that the proposed algorithm could improve the efficient of the network spectrum resources usage and make the traffic bearing distribution more uniform.关键词：elastic optical networks;multi-core fiber;crosstalk;co-evolution
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发布时间： - 摘要：Time Domain Hybrid Modulation（TDHM）can significantly improve the spectrum efficiency and capacity of optical channel in optical networks.Based on the Shared Backup Path Protection（SBPP）,in Wavelength Division Multiplexing（WDM）network,we combine the TDHM technique with Routing and Wavelength Assignment（RWA）,and propose a novel optimal path pair strategy.Simulation studies indicates that,compared with traditional k-shortest path strategy,our new approach can increase the protected network capacity up to 30%,which verifies the efficiency of TDHM technique in terms of improving the transmission capacity in optical networks.关键词：WDM;RWA;optimal path pair;TDH
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发布时间： - 摘要：In order to address the problem of the Serially Concatenated Pulse-Position Modulation（SCPPM）synchronization in large timing error,an SCPPM code auxiliary iterative timing synchronization method based on Expectation Maximization（EM）estimation is proposed.Firstly,the method constructs the evaluation function from SCPPM decoding output soft information,achieving the coarse synchronization of wide range timing offsets,following the EM algorithm for fine synchronization.Then,the complexity of synchronization algorithm is reduced by simplifying the evaluation function and searching method.The simulation results show that the proposed method can realize the system synchronization effectively under large timing error,and the effective synchronization range is greatly improved compared with the EM algorithm.关键词：space optical communication;SCPPM code;EM algorithm;code assistant;iterative timing synchronization
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发布时间： - 摘要：In order to solve the problem of insufficient transmission capacity caused by the rapid growth of information,we propose and investigate a new type of optical fiber is proposed for photon Orbital Angular Momentum（OAM）transmission.The PCVD technique is used to solve the problem of stress damage of optical fiber preform with high refractive index circular core structure.Through repeated process research and verification,the high steady fiber drawing technology suitable for ring core fiber is demonstrated to manufacture the fiber successfully.The fiber has a ring structure with ± 1 and ± 2 order OAM signal transmission at the same time.The fiber transmission loss can still maintain a relatively small level,which can meet the longer scale OAM large-capacity signal transmission.关键词：high-capacity communication;orbital angular momentum transmission;optical fiber
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发布时间： - 摘要：Silicon phase-shifted grating has good wavelength selectivity.Through the coupling equations of phase-shifted grating,the impact of different phase-shift values and grating lengths on the reflectivity of phase-shifted grating has been discussed.By introducing chirp and apodization method,the purpose of broadening the bandwidth,suppressing the side-lobe and the timedelay can be achieved.We design and simulate a silicon phase-shifted chirp apodization grating with 0.18 nm bandwidth and -3 795 ps/nm time delay,which provide the theory foundation for wavelength-controllable coupler and wavelength filter.关键词：phase-shifted grating;chirp coefficient;apodization method;coupled mode
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发布时间： - 摘要：In the era of interconnected by human-network-things,large amount of small data services occupy many non-renewable resources of wireless network in time,frequency and power domains.The paper proposed a "sub System-Carrier" technology sharing existing backward network system methods in time domain.At different times of the same frequency point,small data and backward systems can work together.In frequency domain,we propose bandwidth sharing method to solve the existing problems.In power domain,we propose an idle power factor,which combining the factor with the known selection algorithm.The remaining power can also be an important factor in the optimization of network resource selection.关键词：small data;time domain cloud;frequency domain cloud;power domain cloud;Internet of things
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