9th International Conference on Optical Communications and Networks (ICOCN 2010)
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- Location: Nanjing, China
- Conference date: 24-27 Oct. 2010
- ISBN: 978-1-84919-314-6
- Conference number: CP574
- The following topics are dealt with: optical communication and networks.
1 - 20 of 111 items found
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Full distributed optical fiber sensing technology based on hybrid nonlinear scattering effects
- Author(s): Gong Huaping ; Zhang Zaixuan ; Jin Shangzhong ; Dong Xinyong ; Zhao Chunliu ; Sun Zhongzhou ; Wang Jianfeng ; Yu Xiangdong ; Liu Honglin ; Li Chenxia ; Jin Yongxing ; Li Yi
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Optical fiber Raman scattering; optical fiber Brillouin scattering; optical time-domain reflection (OTDR); intelligent distributed fiber sensor network.
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Location algorithm for multi-disturbances in fiber-optic distributed disturbance sensor using a Mach-Zehnder interferometer
- Author(s): Chunxi Zhang ; Qin Li ; Sheng Liang ; Wentai Lin ; Lijing Li ; Xiang Zhong
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Fiber-optic distributed disturbance sensor (FDDS) can locate a single-disturbance effecting on sensing optical fiber cable, while simultaneous multi-disturbances is possible in the practical applications. The multi-disturbances location algorithm based on correlation theory and frequency-domain analysis for Mach-Zehnder interferometer (MZI) based FDDS is proposed and demonstrated. The theory analysis indicated that the proposed algorithm can locate the multi-disturbances. The difficulty of the proposed method is also discussed, and the future work is presented.
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Improvements of twin-core fiber optical tweezers' performance
- Author(s): M. Sadeghi ; M.H. Sheikhi ; A.R. Kazeruni ; F. Emami
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The techniques of optical trapping and manipulation of neutral particles by lasers, provide unique means to control the dynamics of small particles. These new experimental methods have played a revolutionary role in areas of the physical and biological sciences. This paper reviews the implementation of optical tweezers. At first the basic structure of the twin-core fiber optical tweezers is introduced which has an abrupt tapered shape. Several simulations have been carried out to completely investigate its performance and review the effects of different factors. These parameters include applied phase shift between input electric fields, wavelength and waist of laser beam and grating profile of fiber's cores. All of the investigated parameters are some useful tools which can guide the designers for the best design.
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Optical fiber Fabry-Perot pressure sensor machined by Nd:YAG laser
- Author(s): Junfeng Jiang ; Tiegen Liu ; Kun Liu ; Lijuan Jiang ; Xiao Liang ; Yu Liu ; Meng Wang ; Cong Xu ; Yimo Zhang ; Xuejin Li
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Through laser ablation process, a diaphragm with mesa structure is fabricated successfully in silicon wafer with Nd:YAG laser machining system. Then the silicon diaphragm is used to make optical fiber Fabry-Perot pressure sensor. The pressure sensing experiment showed the sensor had a good linear response with sensitivity 10.6 nm/kPa at the range 40-240 kPa.
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Live cell index sensing based on the reflection mode of tilted fiber tip with gold nanoparticles
- Author(s): Guanghui Wang ; Xinting Zheng ; P.P. Shum ; Changming Li ; Ho-Pui Ho ; Limin Tong
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We presented a micrometer size tapered fiber tip for real-time refractive index measurement of live cell. The tip is cut with a specific tilted angle. Only the cutting surface of tip apex is coated with gold nanoparticles (GNPs) by selective bonding method. The evanescent wave at the apex will excite the localized surface plasmon resonance (LSPR) of GNPs. With enhanced scattering at the resonance wavelength, the tip reflection will experience a loss, which is analogous to attenuated total reflection (ATR). By measure the reflection beam, a wavelength dependent loss dip in the reflection spectrum or an intensity loss of a specific wavelength could be used to detect the refractive index of live cell.
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Advances in optical reflectometry for diagnoses of optical devices and networks
- Author(s): Zuyuan He and K. Hotate
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Following a review of recent advances in the development of optical reflectometry, a novel optical coherence domain reflectometry (OCDR) by use of an optical frequency comb (OFC) source is proposed and demonstrated with high spatial resolution (< 10 cm), large dynamic range (>45 dB), and short measurement time ( 10 s).
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All optical sampling orthogonal frequency division multiplexing systems
- Author(s): Hongwei Chen ; Xingyao Gu ; Minghua Chen ; Shizhong Xie
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A novel all-optical sampling orthogonal frequency division multiplexing (AOS-OFDM) scheme with optical cyclic postfixes (OCP) inserted is proposed and demonstrated. Ultra short pulses are used as optical samples and processed by forward and inverse discrete Fourier transform (DFT/IDFT) modules in optical domain. Optical CPs can be added in the proposed optical DFT modules, which can eliminate optical gates and simplify the receiver structure. In this scheme, high speed real-time OFDM system can be realized without limitation of electronic digital processing. AOS-OFDM system is suitable for different modulation formats, and it has better spectral efficiency and dispersion tolerance than traditional single-carrier optical systems. Compared to coherent OFDM system, it has better fiber nonlinearity tolerance for the low peak to average power ratio (PAPR) induced with fewer sub-carriers.
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Issues on routing in multi-layer and multi domain optical networks
- Author(s): Jie Zhang ; Yongli Zhao ; Xuping Cao ; Wanyi Gu ; Yuefeng Ji
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Routing in multi-layer and multi-domain optical networks is now getting more and more complicated. Path Computation Element (PCE) is proposed to resolve this problem for its advantage to compute a path with overall situations. There are several issues on PCE-based routing architecture in multi layer and multi-domain scenarios, such as multi-layer traffic grooming optimization, physical impairment aware routing across domains and physical impairment information advertisement. In this paper PCE-based traffic grooming strategy in control plane, IA-BRPC routing procedure and a physical impairment processing approach to improve the efficiency of advertisement are discussed respectively.
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Optical sensor networks for high-speed railway applications (Invited Paper)
- Author(s): Lianshan Yan ; Zhaoting Zhang ; Kunhua Wen ; Wei Pan ; Bin Luo
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High-speed railway systems start to be widely deployed. We review recent demonstrations of FBG sensors used for the strain measurement and axle-counting in high-speed railway systems. Pros and cons are compared in terms of feasibility and cost-effectiveness. Network issues are also discussed.
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Dynamic optical network system for adapting the diversification of services
- Author(s): H. Kimura
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This paper proposes the novel network design concept 'Dynamic optical network system' which is different from current networks design 'Static optical network system'. Proposal can adapt various applications, services with quite different characteristics such as bandwidth, latency, so can reduce the network power consumption drastically against the current networks and realize the high efficient use of network resource.
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On user-participated and service-oriented optical networks
- Author(s): Yunfeng Peng and Kunjun Jiang
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ICT (Information and Communication Technologies) networks are moving to support data, voice, video converged triple play, service-oriented intelligence of resource sharing, reconfiguration, and user-participated DIY (Do It Yourself) on virtual private network control and management. To accommodate these amazing features, future optical network should provide intelligent control and management for reliable transmission, which may employ user-participated and dedicated end-to-end lightpath such as the UCLP of CANARIE CANET4, also highly dynamic operation facilities for distributed multi-domain interconnecting. This paper forces on challenges and potential enabling technologies for user-participated and service-oriented optical networks. The topics involved include network virtualization, service model, architecture, and implementation, user-participated network interface.
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Research on multi-rate quasi-synchronous coherent time-spreading OCDMA system
- Author(s): Zhengfeng Xiao ; Jianhua Ji ; Ming Xu ; Shuwen Yang
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We propose a novel scheme of multi-rate quasi-synchronous coherent time-spreading OCDMA system, employing orthogonal variable spreading factor (OVSF) codes with a zero-correlation zone. Within permissible time delay, multiple-access interference and beat noise can be removed in multi-rate quasi-synchronous coherent time-spreading OCDMA system, and the near-far problem can also be eliminated. Simulation of eight simultaneous users with 1.25 Gbit/s and 0.625 Gbit/s is demonstrated, where the fiber link consists of 20 km single-mode fiber, plus 2 km Dispersion Compensating Fiber.
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The design of PON+EoC access networking and home gateway system
- Author(s): Wei Ji and Wei Cui
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The paper proposes the design of Home Gateway used in PON+EoC accessing. On the customer's side, the Home Gateway finishes the RF signal receiving, provides three kinds of interfaces for the high definition video, voice, data, and attains the integration of the three services.
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Fiber optic nerve systems based on correlation domain coutinuous wave technique
- Author(s): K. Hotate and Zuyuan He
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"Fiber optic distributed sensing schemes" have been studied to make smart structures and materials. Using optical correlation domain techniques, we have realized mm-order spatial resolution, KHz-order measurement speed, and discriminative measurement of strain and temperature.
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Routing and wavelength assignment in optical networks with fairness consideration
- Author(s): Xiang Peng ; Wang Rong ; Pu Tao
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The routing and wavelength assignment (RWA) problem with fairness consideration is discussed in this paper. Based on an existing traffic classification and wavelength reservation scheme, an enhanced wavelength reservation scheme with fairness consideration is proposed. Simulation results demonstrate the better performance of the proposed scheme in terms of optimizing traffic connection fairness and reducing average traffic blocking probability.
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A broadcast scheme with cross-gain modulation in WDM-PON
- Author(s): Hanlin Feng and Fengqing Liu
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In this paper, the effect of SOA cross-gain modulation (XGM) is applied to eliminate the extinction ratio (ER) restrict of downstream signal in WDM-PON. A novel semi-passive optical distribution network (ODN) is designed, in which broadcast function is implemented in physical layer by adding a SOA to transfer broadcast signal from one channel to all channels. The scheme makes both high ER unicast and broadcast signal be transmitted in the downstream direction. Numerical results show that utilization of high ER Non Return to Zero (NRZ) signal improves BER performance of both downstream and upstream channels, when up and downstream data rates are 2.5Gbit/s.
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An accurate blocking model based on time slot analysis for optical burst switching networks without buffers
- Author(s): Jiuru Yang ; G. Buyin ; Yan Huang ; Hongan Ye
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To evaluate the performance of optical burst switching network accurately, a computation on blocking probability of core nodes is conducted based on the time-slot analytical method, when no buffer and converter is applied. Numerical results show that, the proposed analytical model is more accurate on the blocking probability than the M/M/1/1 model, and the mean deviation with the simulation results is about 7% in all traffic states.
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Joint scheduling for massive data aggregations over WDM backbone-access networks
- Author(s): Min Zhu ; Shilin Xiao ; Wei Guo ; Meihua Bi ; He Chen ; Weisheng Hu
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For real-time massive data aggregations, we propose a WDM backbone-access network and design an integrated OADM OLT interface node to realize all-optical connections between the backbone and the access networks. Under such a network infrastructure, we formulate a Light-path-Assignment and Time-Scheduling (LATS) problem for the massive data aggregation application. We prove this problem to be NP complete and develop a heuristic approach based on problem decomposition. Extensive simulations demonstrate the effectiveness and the feasibility of the proposed approach.
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Performance comparison between dynamic optical circuit switching and optical burst switching
- Author(s): M.T. Barros ; P.R. Lins ; M.S. Alencar
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Optical networks have been proposed as the main infrastructure for interconnecting networks with large data flows. For those networks, two switching paradigms have been discussed: the optical burst switching (OBS) and optical circuit switching (OCS). A direct comparison between the performance of OBS and OCS is important for the design of more efficient networks. In this paper, various settings of routing and wavelength selection algorithms, for both OCS and OBS networks are implemented and compared. The blocking probability and the average transmission duration for a Poissonian traffic are the evaluation parameters.
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Power-efficient OADM port assignment based on connection holding-time awareness
- Author(s): Shu Du ; Yunfeng Peng ; Keping Long ; Shengfeng Zhang
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The global warming and the energy crisis require an energy saving information communication network, including in the optical networking. Recently, network nodes are becoming more modular, which provides more flexible power management. In this work, we consider modular node architecture and first introduce power-saving in the OADM port assignment problem. A power-efficient port assignment approach, called STA, is proposed which exploits the knowledge of lightpath holding time to improve the performance of power-saving. We conduct simulation experiments on 14-node NSF network, and observe that significant power saving is achieved by employing our algorithm comparing to other holding-time-unaware algorithms.
