The electro-optic properties of a maleimide-based second-order nonlinear optical polymer system, PHSD, were reported. This polymer was synthesized via the Mitsunobu reaction by doping Disperse Red1 moieties into the m...
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The electro-optic properties of a maleimide-based second-order nonlinear optical polymer system, PHSD, were reported. This polymer was synthesized via the Mitsunobu reaction by doping Disperse Red1 moieties into the maleimide system as side chains. Its glass transition temperature was measured to be 202°C by DSC technology. The spin-coated thin film samples were poled by a corona poling system with a bias-controlled grid at 8 kV. After poling the electro-optic coefficient was measured to be as large as 3.03 pm/v at 1550 nm by a Mach-Zehnder interferometer. Except for an initial decay after poling, PHSD exhibits little electro-optic relaxation and its electro-optic coefficient remains at -2.46 pm/v after 15 days. Results show that PHSD possesses large nonlinearity, high thermal stability and long-time stability.
Switching-window in an interferometric configuration of a gain-transparent ultrafast nonlinear interferometer (gt-UNI) is investigated numerically. The phase change is observed in detail. To assess the performance of ...
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Switching-window in an interferometric configuration of a gain-transparent ultrafast nonlinear interferometer (gt-UNI) is investigated numerically. The phase change is observed in detail. To assess the performance of switching window, the integrated contrast ratio (ICR) is introduced. For the data pulse with the bit width of 6.25 ps and with the energy of 60 pJ, respectively, the ICRs in different situations are simulated using modified nonlinear Schrodinger equation (MNLSE) considering of the carrier depletion pulsation (CDP), carrier heating (CH), and spectral-hole burning (SHB). The results show that the maximum ICR is located at the optimum position of the semiconductor optical amplifier (SOA) that is determined by the width and energy of the control pulse.
This paper investigates the traffic properties before and after assembly at edge node of Ethernet over optical burst switching （OBS） network for the first time. Burst and inter-arrival time distributions are simulat...
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This paper investigates the traffic properties before and after assembly at edge node of Ethernet over optical burst switching （OBS） network for the first time. Burst and inter-arrival time distributions are simulated under time-based and length-based assembly schemes. Self-similar traffic Hurst parameter is compared through R/S and V/T plot. Finally three self-similar traffic generating methods are given. Simulation resuhs demonstrate that, muhi-source traffic increases self-similar degree, however after assembly, time-based scheme can decrease self similar degree, and aggregated burst size is close to Gaussian distribution. Length-based method has no effects on the self-similarity of input traffic. RMD is fit for study of burst network with large self-similarity.
To achieve lower assembly delay at optical burst switching edge node, this paper proposes an approach called current weight length prediction (CWLP) to improve existing estimate mechanism in burst assembly. CWLP metho...
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To achieve lower assembly delay at optical burst switching edge node, this paper proposes an approach called current weight length prediction (CWLP) to improve existing estimate mechanism in burst assembly. CWLP method takes into account the arrived traffic in prediction time adequately. A parameter 'weight' is introduced to make a dynamic tradeoff between the current and past traffic under different offset time. Simulation results show that CWLP can achieve a significant improvement in terms of traffic estimation in various offset time and offered load.
作者：
Sui, ZhichengZeng, QingjiXiao, Shilin
State Key Lab. of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Minhang Shanghai 200240 China
Traditional burst assembly method only differ service class priority by increasing extra offset time so as to assure QoS at optical Burst Switching (OBS) core node which increases all network delay extremely, especial...
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Traditional burst assembly method only differ service class priority by increasing extra offset time so as to assure QoS at optical Burst Switching (OBS) core node which increases all network delay extremely, especially for opticalnetwork with many hops and large radius. In order to take full advantage of flexible buffer and control function of electronics device and optical large capacity predominance, it is desired to process real-time traffic at edge ingress node and guarantee delay fairness under small enough delay and QoS based on offset time differentiation for various classes. To achieve lower assembly delay at OBS edge node and offset time based QoS guarantee at core node, this paper proposes an approach called Prediction and Offset QoS Assembly (POQA) to improve existing burst assembly mechanism at edge node. POQA method takes into account the delay fairness and QoS-based offset time adequately. The ratios of assembly time and offset time are introduced to make a delay and offset differentiation among various traffic classes. Assembly delay, burst size, burst utilization and length error of various classes are compared under different offered load. Moreover, in contrast with traditional time assembly method, simulation results show that POQA method can achieve a significant improvement in terms of burst delay and utilization and realize the delay fairness and offset time QoS differentiation under different traffic offered load.
In this paper, a new Mixed Integer Linear Programming algorithm is proposed to resolve the light-tree routing and wavelength assignment with wavelength continuity constraints. The node in our system is limited branchi...
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This paper analyzed the security hole of a quantum key distribution and quantum authentication protocol through once quantum communication, which can withstand interception/resend attack strategy and entanglement atta...
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This paper analyzed the security hole of a quantum key distribution and quantum authentication protocol through once quantum communication, which can withstand interception/resend attack strategy and entanglement attack strategy but can not resist the entanglement/interception attack strategy. Strictly speaking, only through once quantum communication, could not the QKD and QA protocol be achieved in the context of jammable channel. According to the conditions of the original protocol, two new protocols were proposed: one measures the shared GHZ states directly and the other adds a check process to resist the entanglement/interception attack strategy.
Dynamic point-to-multipoint trees were demonstrated in opticalnetworks for the first time. Setup, teardown, grafting and pruning operations of trees were successfully achieved by using extensions to GMPLS protocols.
ISBN:
(纸本)0863415431
Dynamic point-to-multipoint trees were demonstrated in opticalnetworks for the first time. Setup, teardown, grafting and pruning operations of trees were successfully achieved by using extensions to GMPLS protocols.
We propose and demonstrate a novel packet-switched PON with waveband selectivity in ONUs, which enables internetworking of ONUs in a group. This configuration clearly improves the latency and throughput performance by...
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ISBN:
(纸本)0863415431
We propose and demonstrate a novel packet-switched PON with waveband selectivity in ONUs, which enables internetworking of ONUs in a group. This configuration clearly improves the latency and throughput performance by reducing the electronic bottleneck in the OLT.
We propose and demonstrate a new 160-Gb/s signal format employing phase inversion of every four consecutive bits in a group. This format enables simple clock recovery by spectral filtering, and increases the nonlinear...
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