混合ossiocs网络中基于突发插空的传输机制(英文)

Hybrid optical switching networks make full use of the advantages of Optical Circuit Switching(OCS)and Optical Burst Switching(OBS).In parallel hybrid optical switching networks,edge nodes choose a switching mode for traffic and no longer change.The inflexible decision making of the traffic transfer mode leads to low resource utilization when the arrival rate of the OCS traffic is lower than the capacity of the light path.In this paper,a new transmission scheme is proposed to improve resource utilization for hybrid optical switching networks.When the traffic arrival rate of the light path is lower than the transmission rate of the light path,the OCS traffic flow is reshaped at the edge nodes to generate a series of voids.Then,several message packets are sent along the light path to inform the core nodes of the voids of the light paths that represent the unused bandwidth resources.To improve the resource utilization,the voids can be filled with data bursts by core nodes.The simulation results show that the new scheme can effectively reduce the burst loss rate and improve the link utilization of the hybrid optical switching network on the premise of a providing service quality guarantee for OCS traffic.     

Slow light propagation without absorption based on intersubband transitions in a semiconductor quantum well

When semiconductor quantum wells(SQWs) interact with lasers,the group velocity of the low-intensity light pulse is studied theoretically.It is shown that by adjusting the parameters,slow light propagation of the probe field can be exhibited in such a system.Meanwhile,the probe absorption-gain spectra can be changed from absorption to zero,i.e.,electromagnetically induced transparency(EIT).It is easy to observe the light propagation experimentally,and it leads to potential applications in many fields of solid-state quantum information,for example,optical switching,detection and quantum computing.     

Detection and Ranging System of Flight Aid Lights

Dynamic detection based on optics sensors and ranging radars is a new method to detect the luminous intensity of flight aid lights. The optics sensors can get the illumination information of each light, the ranging radar gets the distance information, and then data amalgamation technology is used to compute the luminous intensity of each light. A method to modify the errors of this dynamic detection system is presented. It avoids the accumulation error and measurement carrier＇s excursion error by using peak value detection based on optics sensors to estimate the accurate position of each light, then to modify the lights＇ lengthways distance information and transverse position information. The performance of the detection and ranging system is validated by some experiments and shown in pictures.     

Evaluating quality of motion for unsupervised video object segmentation

Current mainstream unsupervised video object segmentation (UVOS) approaches typically incorporate optical flow as motion information to locate the primary objects in coherent video frames. However, they fuse appearance and motion information without evaluating the quality of the optical flow. When poor-quality optical flow is used for the interaction with the appearance information, it introduces significant noise and leads to a decline in overall performance. To alleviate this issue, we first employ a quality evaluation module (QEM) to evaluate the optical flow. Then, we select high-quality optical flow as motion cues to fuse with the appearance information, which can prevent poor-quality optical flow from diverting the network’s attention. Moreover, we design an appearance-guided fusion module (AGFM) to better integrate appearance and motion information. Extensive experiments on several widely utilized datasets, including DAVIS-16, FBMS-59, and YouTube-Objects, demonstrate that the proposed method outperforms existing methods.     

Exciton-polariton based WS2 polarization modulator controlled by optical Stark beamOA

The recent era of fast optical manipulation and optical devices owe a lot to exciton-polaritons being lighter in mass,faster in speed and stronger in nonlinearity due to hybrid light-matter characteristics.The room temperature existence of polaritons in two dimensional materials opens up new avenues to the design and analysis of all optical devices and has gained the researchers attention.Here,spin-selective optical Stark effect is introduced to form a waveguide effect in uniform community of po...     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Universal Spectral Modulation Sensors：（Ⅰ）Theory and Structure^①

A universal spectral modulation sensor with low cost,stable,reliable and accurate performances is presented.The optical measuring device using a universal spectral modulation sensor is immune to change the intensities of the light source and light transmission due to optical fiber bending and optical fiber connector loss.The spectral modulation sensor system can detect and measure various physical parameters such as pressure,temperature,gas density,and various chemical species.     

A new scheme of implementing all-optical logic systems exploiting material nonlinearity and polarization based encoding technique

In this letter, the authors propose a new concept of implementing all-optical logic gates by representing the logic states with polarization of an optical signal .As the state of polarization of the light signal is very much suitable for encoding and detecting the bits of data of a digital signal in communication, the scheme may extend some wide applications in all- optical parallel computation and information processing.     

Tunable attenuator based on polymer microstructured optical fibers

The polymer microstructured optical fiber is a kind of fiber whose core and cladding are composed of air holes and organic compornoleel by a certain rule. Similar with silica microstructured optical fibers (SMOF), according to the light guide mechanism PM…     

Spectrum Illumination for 3— Surface Imaging System

A method using spectrum illumination to reconstruct 3-D bject image is a new concept in the field of computer vision.The design of optical illumination system is crucial this method.Several ways to achieve multicolor spectrum illumination are discussed.A prism illumination system is designed by means of aligning symmetrically the prism at the mid-wavelength(nd=1.806 274)of light path and using reflection collimating lens,cylindrical expending lens and two optical shutters.The relations between deviation angles and light wavelengths are given,and some 3-D reconstruction results are presented.     

Nonlinear optics with structured lightOA

The interest in tailoring light in all its degrees of freedom is steadily gaining traction, driven by the tremendous developments in the toolkit for the creation, control and detection of what is now called structured light. Because the complexity of these optical fields is generally understood in terms of interference, the tools have historically been linear optical elements that create the desired superpositions. For this reason, despite the long and impressive history of nonlinear optics,only...     

Light Actuation of Liquid in Optofluidics

Optofluidics is the integration of optics and microfluidics（so-called lab on the chip）. Wherein the actuation of liquid is a key technic. In a variety of methods for controlling microscale liquid, the light actuation is particularly interesting. The light actuation offers a novel way to control the flow of fluids for biomedical and biotechnological applications, etc.. The complexity and cost of devices sometimes may be greatly reduced by using complete optical control and may be more flexible in operation than other methods. However the light actuation of liquid is a burgeoning field as well as optofluidics. There is lots of work to do. Here we systematically describe four mechanisms for the light actuation of liquid based on the following points： optoelectrowetting, photothermal effect, radiation pressure, photosensitive substance.     

Left-handed and right-handed rotation double function circular polarizer

In order to gain circularly polarized light of left-handed and right-handed rotation by using a fixed device, a left-handed and right-handed rotation double function circular polarizer is designed with two λ/4 retarders and one polarizer, and its operating principle is analysed by matrix optical means. The result indicates that when the monochromatic light enters this circular polarizer in the positive direction and the negative direction,the emergent light should be circularly polarized light, of left-handed and right-handed rotation respectively. The testing system has been established to verify the above results.     

Research of all-optical ultra-wideband triplet signal source based on a single semiconductor optical amplifier

A novel scheme for all-optical ultra-wideband triplet signal pulse generation based on the cross-gain modulation (XGM) in a single semiconductor optical amplifier (SOA) is demonstrated. In this scheme, only one optical source and one SOA are needed, so the configuration is simple. Due to only one wavelength is included in the generated triplet pulse, no time difference between output signal light and probe light is introduced during the transmission process. By using the software of Optisystem 7.0, the impacts of the input signal width, the optical power and the wavelength of the optical source on the generated triplet pulse are numerically simulated and studied. The results show that the proposed scheme has better triplet signal pulse when the input signal pulse width is larger, and it is insensitive to the wavelength change within a certain range.     

Theoretical study on modulating group velocity of light in photonic crystal coupled cavity optical waveguide

We present a novel mechanism,which is formed by periodically changing the radii of dielectric rods in the middle row of a photonic crystal,to control and stop light.Using the Bloch theory and coupled-mode theory,the dispersion characteristic of such a photonic crystal coupled cavity optical waveguide is obtained.We also theoretically demonstrate that the group velocity of a light pulse in this system can be modulated by dynamically changing the refractive index or radii of the selected dielectric rods,and the light stopping can be achieved.     

Use Single—chip Computer to Realize Automatic Compensation for Optical Fiber Sensors

Being directed againet two kinks of noise in optical fiber sensors,a sim-ple and effective method of automatic compensation for optical fiber sensors is presented.Not only the unstability effect of light source,but also zero drift of photoelectronic de-vices,can be eliminated or enormously restraned with the aid of this method.In another way,by using single-chip mrcrocomputer,the optical fiber sensor system fabricated is caonneted to a copmuter networks to realize an automatic compensation.     

A new scheme of implementing all-optical logic systems exploiting material nonlinearity and polarization based encoding technique

In this letter,the authors propose a new concept of implementing all-optical logic gates by representing the logic states with polarization of an optical signal .As the state of polarization of the light signal is very much suitable for encoding and detecting the bits of data of a digital signal in communication,the scheme may extend some wide applications in all-optical parallel computation and information processing.     

Ostensibly perpetual optical data storage in glass with ultra-high stability and tailored photoluminescenceOA

Long-term optical data storage(ODS) technology is essential to break the bottleneck of high energy consumption for information storage in the current era of big data. Here, ODS with an ultralong lifetime of 2×10⁷ years is attained with single ultrafast laser pulse induced reduction of Eu³⁺ ions and tailoring of optical properties inside the Eu-doped aluminosilicate glasses. We demonstrate that the induced local modifications in the glass can stand against the temperature of...     

Growth Model of Local Government Websites

To clarify the concept framework to assess web based information systems (WIS) evolution from an information perspective instead of the usual systems perspective, and to seek for in-depth understanding of maturing patterns of WISs based on the framework, several central concepts related to the information aspect of WIS are firstly discussed, then a growth model of local government websites based on a survey study is proposed.     

Implementation of an optical S-R flip-flop with polarization encoded light signal

A new method is proposed to implement an optical S-R flip-flop by polarization encoded light signal,necessary optical nonlinear material and half-wave plate.In this system the real time speed of operation can be achieved,and at the time of transmission the average power of a byte remains constant.This polarization encoded flip-flop can act as a memory cell.