最新刊期
卷 ， 期 6 ， 2015
- 摘要：Si light source is the core device for making Si-based integrated optoelectronic chips.In recent years,multiple major results have been achieved in this respect at home and abroad,but there is still lack of small-size,low power consuming,process compatible and highly efficient Si-based emitters appropriate for the next generation large-scale optoelectronic integrated chips.In this paper,our research results in making Si-based light emitting devices in Ge quantum dots embedded in Si photonic crystal microcavities are introduced.Among others,we realized resonant light emission in the communication waveband at room-temperature by embedding the Ge self-assembled quantum dots grown by the molecular beam epitaxy method in the Si photonic crystal microcavities and the positioning of Ge quantum dots by their growth on the patterned sapphire substrate,and the Si-based light emitters based single Ge quantum dot by precisely embedding them in the photonic crystal microcavities.关键词：Si-based light-emitting device;Ge quantum dot;optical microcavity
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发布时间： - 摘要：The silicon-based optical interconnect technology is an effective means for breaking the current bottleneck of the electronic interconnects,and the applicable integrated light sources are of great significance to the reduction of size and power consumption of silicon chips.We have seen a series of important breakthroughs in lasers integrated on silicon chips in the past decade or more,and the III-V/Si hybrid integrated laser is one of the most possible solutions among them to be actually applied in the near future.In this paper,we briefly describe its research status,focusing on the research progress and respective problems of the III-V/Si hybrid integrated lasers,including the III-V/Si adhesively bonded laser and the III-V/Si flip-chip laser.Finally,we predict the development orientation of the lasers integrated on silicon.关键词：optical interconnect;silicon-based laser;hybrid integration
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发布时间： - 摘要：In this paper,the applications and research value of silicon nonlinear effects of silicon photonics in digital photonic circuits are first introduced.Then,the opto-mechanical effect and thermo-optic effect in silicon-based nano-waveguides are briefly presented.Finally,the applications of the opto-mechanical effect in route-asymmetrical light transmission,and the implementation of optical ordered-route transmission and optical encoding by using thermo-optic effect are described in detail.关键词：nonlinear effect;digital photonic circuit;opto-mechanical effect;thermo-optic effect
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发布时间： - 摘要：This paper presents a configurable optical filter based on a multi-stage cascaded delay interferometer,which can be refigured as two types of filters to achieve the tuning of the filter bandwidth:single delay interferometer and multiple delay interferometer The former tunes the filtering period and bandwidth by increasing the retardation and the other tunes the bandwidth of the constant filtering period by changing the number of the cascaded stages and the splitting ratio of the MZI switches.It builds a theoretical model of this delay interference filter by using the transfer matrix method and performs its simulation.The test results of the secondary and third delay interferometers show that the bandstop filter bandwidth can vary by over 1/3filter period.关键词：optical device;integrated phonic（optics）device;tunable optical filter
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发布时间： - 摘要：With the increasing complexity of Photonic Integrated Circuits（PICs）,it is necessary to carry out their real-time monitoring in links by using the optical power monitor for the effective analysis of the device behavior without affecting the normal operation of the system.This paper summarizes the latest research advances in silicon-based optical power monitors with the emphasis on the optical power monitoring schemes in different absorption mechanisms,such as surface-state,two-photon,Ge and defect-state.and their respective advantages and disadvantages.Finally,it discusses in detail the great superiorities of using the defect-state absorption mechanism for photo-electric conversion.关键词：silicon-based photoelectric device;optical power monitor;photoelectric detector
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发布时间： - 摘要：As a single-channel demodulation system can detect only a limited number（up to a dozen）of grating wavelengths a time and it is necessary to take into account the stability and high speed of both the Fiber Bragg Grating（FBG）demodulation system and host computer communications,a multi-channel,multi-communication-port FBG demodulation system is developed using the Wavelength Division Multiplexing（WDM）and Spatial Division Multiplexing（SDM）technologies.By controlling the lightpath switching of a 16-channel optical switch,the SDM of the 16-channel FBG sensing network and the demodulating of the center wavelength in each channel sensor can be realized.Test results show that the center wavelength resolution of the demodulation system is 1pm and the time for collecting the granting wavelength information once is 620 ms,the minimum time for updating 16-channel FBG sensor information is not longer than 10 s.In addition,it is possible to effectively monitor about200 fiber grating sensors.关键词：FBG;demodulation system;16channels;optical switch;WDM;SDM
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发布时间： - 摘要：In order to address the problem of spectrum allocation for time-varying services in flexgrid optical networks,this paper proposes a novel scheme of spectrum allocation,which is mainly based on Non-Contiguous Virtual Connections（NCVC）.In this scheme,new non-contiguous spectrum blocks can be allocated to satisfy the increased bandwidth requirement of the service transmission without changing the already allocated spectrum blocks.Simulations are performed on the simulation platform built by using the OMNeT++ software and the numerical results show that this scheme can effectively reduce the network blocking probability and improve the utilization efficiency of network spectrum sources.关键词：FG-ON;NCVC;time-varying service;blocking rate
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发布时间： - 摘要：In order to realize multi-access in Ultra-WideBand（UWB）-over-fiber systems,this paper presents a scheme based on PM-IM conversion and multi-channel frequency discrimination for Binary Phase Shift Keying（BPSK）-encoding by using 3rd-order UWB pulse signals,analyzes its working principle and performs the relevant simulation using Optisystem13.0.It obtains different BPSK-encoded sequences with a central frequency of 6.7GHz and a relative bandwidth of 104.5%,complying with FCC specifications for UWB signals.Then,it analyzes the impacts of Gaussian pulse width and optical power on the simulation results,finding that when the Gaussian pulse width is 0.5bit,the frequency spectrum of the obtained signals is the most ideal,while when the light source power is below 26 dBm,the Power Spectral Density（PSD）complies with the FCC requirements.These results provide a possible scheme for the encoding requirements of multi-user access in UWB-over-fiber systems.关键词：UWB signal;BPSK;encoding;high-order UWB signal
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发布时间： - 摘要：A telluride Photonic Crystal Fiber（PCF）with low-loss and high nonlinearity is designed and the nonlinear Schrodinger equation is solved by using the split-step Fourier algorithm.Then,the generation and optimization of the mid-infrared Super-Continuum（SC）in the PCF is numerically simulated,the impacts of the parameters of the PCF and pump light source on the SC are analyzed and the variations of the SC width and flatness with the PCF length,dispersion parameters,the peak power value and initial width of pump pulses are obtained.The simulation results reveal that when a pump light with a center wavelength of 2μm,pulse peak power of 20 kW and pulse width of 100 fs travels in the PCF for 15 cm,the SC can span from 1 330 to 3 450 nm with good continuity and flatness.关键词：fiber optics;PCF;SC;nonlinearity;dispersion
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发布时间： - 摘要：A simple-structured four-hole composite photonic crystal fiber with high nonlinearity and low confinement losses is proposed.Its air-hole diameter d =0.2μm and pitch of holesΛ =1.8μm.The numerical calculation results show that when a unique four-hole unit structure is introduced into the cladding region,the nonlinear coefficient is up to 83.3 W-1km-1 and the confinement loss lower than 10-9 dB/m at the wavelength of 1.55μm,and the corresponding effective mode field area is only 1.46μm2.These characteristics can be used in supercontinuum generation,nonlinear optics and optical communication systems.关键词：PCF;nonlinearity;confinement loss;effective mode field area
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发布时间： - 摘要：On the basis of the Brillouin frequency shift characteristics of optical fibers and the basic equations of power transmission lines,we establish the functions of their distributed sag vs their temperature and obtain their temperature distribution.Then we calculate the obtained distributed sag by monitoring the OPtical fiber composite overhead Ground Wire（OPGW）fiber frequency shift value.By comparing the monitored sag value with the actual sag value collected on-site,we see that the monitoring errors remain lower than 10%.The research results provide a safe,convenient and effective method for the distributed sag monitoring of power transmission lines.关键词：sag;OPGW;Brillouin frequency shift;online monitoring
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发布时间： - 摘要：The bean deflection technology based on Micro-Electro-Mechanical System（MEMS）torsion mirror is one of the main technical schemes for Variable Optical Attenuators（VOA）,which is liable to high Wavelength-Dependent Loss（WDL）.This paper presents a design optimization scheme on the basis of analyzing the causes of the WDL.The experimental test results indicate that in the warelength range of 1.531.57μm and the attenuation range of 020dB,the measured maximum WDL is 0.21 dB,verifying the correctness of the theoretical analysis.关键词：fiber-optic communication;VOA;WDL;MEMS
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发布时间： - 摘要：In this paper,a novel photonic crystal ring resonator-based THz filter is proposed.In the resonator,a square dielectric rod is introduced and a scattering dielectric rod is introduced to each side of the rod.Silicon with refractive index n =3.4is used as the substrate material with the lattice constant Aof 30μm.This filter is simulated and analyzed by using the FDTDbased Rsoft software and the results show that when the dielectric rod radius Ris 5.157 5μm,the side length of the internal square dielectric rod Lis 92μm with a rotation angle of 6°and the scattering dielectric rod radius R1 is 5μm,the transmittance at the wavelength of 94.053μm is 0.985 56.关键词：photonic crystal;ring resonator;THz filter
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发布时间： - 摘要：On the basis of analyzing the principle of Fiber Bragg Grating（FBG）sensors,a novel FBG magnetic field sensor based on giant magnetostrictive material is designed.A FBG is first stuck to the giant magnetostrictive material and in order to compensate the effects of temperature on the FBG sensor,one end of another FBG is fixed to a plexiglass and kept in a free state.Then the experimental study on the response characteristics of temperature and magnetic field intensity of the designed sensor is performed.In the range of 040 ℃,the temperature sensitivities of the magnetic field measurement and the FGB temperature compensation are 22 and 9.9pm/℃ respectively.When the magnetic field intensity is 01 200 ×10-4 T,the magnetic field detection sensitivity of the sensor is about 1pm/1×10-4 T,the resolution is 1×10-4 T,the linearity is 0.996 3and the stability is about±3×10-4 T.This study results provide a new method for the measurement of weak magnetic fields.关键词：magnetic field sensor;FBG;temperature compensation
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发布时间： - 摘要：In this paper,a novel algorithm for iterative joint channel estimation and signal detection is proposed.It makes the channel estimation of the next OFDM symbol by using the signals detected by using the ZF algorithm,then effectively eliminates the inter-symbol and inter-carrier interferences by making full use of the mutual information between the channel estimation value and the detection symbols,thus improving the precision of the channel estimation and symbol detection.The simulation results show that under different channel conditions,this algorithm performs remarkably better than the traditional signal detection methods.关键词：OFDM;iterative channel estimation;joint signal detection
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发布时间： - 摘要：In this paper,the modulation and demodulation principles for the coherent Differential Phase Shift Keying（DPSK）are briefly introduced and theoretical analysis of three coherent demodulation modes,i.e.homodyne,heterodyne and Mach-Zehnder Interference（MZI）demodulations,is made.Using Matlab and Optisystem simulation software,a DPSK modulationbased Free Space Optical（FSO）communication system is built,the effects on the system BER performance under different conditions obtained and the three demodulation modes simulated.The simulation results show that homodyne coherent detection with better BER performance is most suitable for FSO.关键词：DPSK;homodyne demodulation;heterodyne demodulation;MZI demodulation
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发布时间： - 摘要：In view of insufficient network throughput and large network overhead in the exiting Duplicate-Free Opportunistic Routing（DFOR）algorithm,this paper presents an Efficient Opportunistic Rrouting（EOR）algorithm.This algorithm can efficiently enhance the data packet sending rate by improving the sending batch.In the course of transmissions,it reduces the size of the packet header so as to ensure the full utilization of every packet.In addition,it analyzes the possible lengthy latency in sending in the original algorithm.The theoretical analysis and simulation results show that compared with the DFOR algorithm,the EOR algorithm performs better in terms of network overhead and network throughput.关键词：optimistic routing;efficient;overhead
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发布时间： - 摘要：As the current researches on the channel modeling of white LED-based indoor Visible Light Communication（VLC）mainly focus on its theoretical analysis,the influence of channel characteristics on system performance is not yet definite.In this paper,we first analyze and optimize the theoretical channel model and on this basis,work on the channel codec algorithm.By building a channel model and a VLC system by Simulink,we analyze the effects of channel encoding on the system performances,thus obtaining channel encoding method suitable for the channel characteristics of VLC systems.关键词：VLC;channel model;channel coding;BER analysis
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发布时间： - 摘要：This paper first introduces the superiorities the visible light networking technology and analyzes the feasibility of its applications in astrocrafts.Then,it presents an implementation scheme for system networking and conducts the calculations of power margin.The results indicate that the visible light networking technology is applicable to the networking in the LAN of astrocrafts.Finally,it describes the relevant technological challenges to the networking and predicts the prospect of its applications to astrocrafts in the future.
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