METHOD OF OPTIMIZING ELEMENTS OF INTEGRATED OPTICAL AUTHENTICATION MODULE

2021 ◽  
pp. 245-252
Author(s):  
Ольга Александровна Кулиш
Keyword(s):  
Information Exchange ◽  
Optical Radiation ◽  
Optical Signal ◽  
Control Device ◽  
Authentication Code ◽  
Element Analysis ◽  
Index Method ◽  
Network Attacks ◽  
Input And Output ◽  
Integrated Optical

В ходе информационного обмена между локальными вычислительными сетями пользователей передаваемая информация проходит через не защищенную сеть провайдера связи. Отсутствие аутентификации коммутаторов позволяет злоумышленникам осуществлять сетевые атаки на коммутаторы второго уровня модели OSI. Для устранения проблемы аутентификации коммутационного оборудования канального уровня можно использовать модуль аутентификации, встроенный в коммутатор. В работе приведена схема интегрально-оптического интерферометра для устройства управления оптическим излучением модуля аутентификации. Так как для передачи кода аутентификации применяется ослабленное лазерное излучение, то актуальным является расчет потерь оптического сигнала в интерферометре. Высокие потери оптического излучения могут происходить во внутреннем двойном изгибе спирали и во входном и выходном разветвителях интерферометра. Разработана методика оптимизации этих элементов интерферометра для уменьшения потерь оптического сигнала. Методика основана на методе распространяющегося пучка, методе эффективного показателя преломления и конечно-элементном анализе. На основе разработанной методики можно оценить оптимальное смещение волноводов в точке перегиба внутреннего S-изгиба спирали, геометрические параметры входного и выходного разветвителей. During information exchange between local computer networks of users, the transmitted information passes through an unprotected network of a communication provider. The lack of switch authentication allows attackers to carry out network attacks on Layer 2 switches of the OSI model. You can use the authentication module built into the switch to resolve the link layer switching equipment authentication problem. The work shows the integrated optical interferometer circuit for the optical radiation control device of the authentication module. Since attenuated laser light is used to transmit the authentication code, the calculation of optical signal losses in the interferometer is relevant. High losses of optical radiation can occur in the inner double bend of the spiral and in the input and output splitters of the interferometer. A technique has been developed to optimize these interferometer elements to reduce optical signal losses. The technique is based on the propagating beam method, the effective refractive index method, and finite element analysis. Based on the developed technique, the optimal displacement of waveguides at the inflection point of the internal S-bend of the spiral, the geometric parameters of the input and output splitters can be estimated.

scholarly journals PCOI: Packet Classification‐Based Optical Interconnect for Data Centre Networks

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Rab Nawaz Jadoon ◽  
Mohsin Fayyaz ◽  
WuYang Zhou ◽  
Muhammad Amir Khan ◽  
Ghulam Mujtaba
Keyword(s):  
Energy Consumption ◽  
Packet Loss ◽  
Optical Signal ◽  
Packet Classification ◽  
Optical Interconnect ◽  
Cloud Services ◽  
Queuing Model ◽  
Eye Diagram ◽  
Data Centre ◽  
Input And Output

To support cloud services, Data Centre Networks (DCNs) are constructed to have many servers and network devices, thus increasing the routing complexity and energy consumption of the DCN. The introduction of optical technology in DCNs gives several benefits related to routing control and energy efficiency. This paper presents a novel Packet Classification based Optical interconnect (PCOI) architecture for DCN which simplifies the routing process by classifying the packet at the sender rack and reduces energy consumption by utilizing the passive optical components. This architecture brings some key benefits to optical interconnects in DCNs which include (i) routing simplicity, (ii) reduced energy consumption, (iii) scalability to large port count, (iv) packet loss avoidance, and (v) all-to-one communication support. The packets are classified based on destination rack and are arranged in the input queues. This paper presents the input and output queuing analysis of the PCOI architecture in terms of mathematical analysis, the TCP simulation in NS2, and the physical layer analysis by conducting simulation in OptiSystem. The packet loss in the PCOI has been avoided by adopting the input and output queuing model. The output queue of PCOI architecture represents an M/D/32 queue. The simulation results show that PCOI achieved a significant improvement in terms of throughput and low end-to-end delay. The eye-diagram results show that a good quality optical signal is received at the output, showing a very low Bit Error Rate (BER).

An attempt to detect the positronium Lyman alpha spectral line

1963 ◽  
Vol 272 (1350) ◽  
pp. 363-370 ◽  
Keyword(s):  
Automatic System ◽  
Counting Rate ◽  
Optical Radiation ◽  
Optical Signal ◽  
Radioactive Source ◽  
Inert Gases ◽  
Background Counting Rate ◽  
Lyman Alpha ◽  
Negative Results ◽  
Background Counting

The possibility of optical radiation from the 2 p states of positronium is discussed, and an experimental attempt to detect the positronium Lyman α line is described. Photomultipliers were used in the attempted detection. Initially filters, and later a quartz monochromator, were employed as the dispersive elements. Positrons from a radioactive source were stopped in various inert gases, and the total optical signal was recorded by counting circuitry with an automatic system that eliminated background and sensitivity variations. It was estimated that if 1 in 1000 of the positrons stopped in the gas gave rise to a Lyman α emission, then a signal would have been obtained which would be about four times the observed standard deviation in the background counting rate. This peak was not observed, although light from excitation of the target gas was detected. These results are compared with the findings of other workers, and the possible reasons for these negative results are examined.

Kinetostatics Modeling and Decoupling Analysis of a Crosshair Flexures-Based Nanopositioner

2017 ◽  
Author(s):  
Pengbo Liu ◽  
Songsong Lu ◽  
Peng Yan ◽  
Zhen Zhang
Keyword(s):  
Performance Improvement ◽  
Open Loop ◽  
Element Analysis ◽  
Compliance Matrix ◽  
Input And Output ◽  
Stiffness Model ◽  
Decoupling Analysis ◽  
Compliance Matrix Method ◽  
Cross Axis ◽  
Castigliano’S Theorem

In the present paper, we take the input and output decoupling into account and propose a 2-DOF parallel nanopositioner, which is composed of lever amplification mechanisms, compound parallelogram mechanisms and novel crosshair flexures. In order to demonstrate the decoupling performance improvement of the crosshair flexures, the stiffness model of the crosshair flexures and the kinetostatics model of the nanopositioner are established based on Castigliano’s theorem and the compliance matrix method. Accordingly, the input and output decoupling compliance matrix models are derived to demonstrate the excellent decoupling property of the crosshair flexures based nanopositioner, which is further verified by finite-element analysis and experimental results. The open-loop experiments on the prototype stage demonstrate the maximum stroke of the nanopositioner is up to 65μm and the cross axis coupling errors are less than 1.6%.

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