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提出了一种利用相位调制器实现一阶边带抑制的光标记交换(OLS)技术的新方案,在中心载波和其余生成的多个副边带分别进行强度调制,实验产生10Gb/s非归零(NRZ)光载荷和2.5Gb/s垂直频分复用(OFDM)光标记信号,并分别在单模光纤中传输了50km。分析了基本原理,进而建立了一简单的系统理论模型,最后通过仿真和实验相结合的方法验证了方案的可行性。 相似文献
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A novel scheme of all optical header extraction using a semiconductor optical amplifier-Mach-Zehnder-Interferometer with asymmetric
control light is proposed for optical packet switching with all-optical header processing at a header rate of 20 Gb/s and
payload rate of 80 Gb/s in this article. The scheme parameters are discussed and analyzed to optimize the performance of optical
header extraction with the proposed scheme. Numerical analysis and simulation show that a more than 17 dB contrast ratio can
be achieved for the optical header separation when the input optical signal energy is as low as 0.2 pJ. In addition, the system
structure is simple, stable, and photonic integratable. 相似文献
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A novel orthogonal modulation format of D8PSK/ASK with differential bi-phase encoding and its application in a label switching optical network 下载免费PDF全文
Zhang Xing Zhang Xiao-lei Wang Yong-jun Xin Xiang-jun Yin Xiao-li Li Ling Zhao Ji-jun 《光电子快报》2012,8(2):129-133
The principle of a novel orthogonal modulation format of differential 8-level phase-shift keying amplitude-shift keying (D8PSK/ASK) with differential bi-phase encoding (DBC) is introduced. Based on it, an optical labeling scheme, in which the payload is 100 Gbit/s D8PSK signal and the label is 10 Gbit/s DBC-ASK signal, is proposed and simulated. The results are compared with other current schemes, and the effects of transmission range, modulation extinction ratio (ER) and received power on system performance are analyzed, respectively. The results show that the spectrum efficiency and bit error rate (BER) are improved greatly, and when the modulation ER is increased to 11 dB, the balanced performance between the payload and label is achieved. 相似文献
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A novel scheme of optical-code label (OC-label) switching based on a special optical packet generation where the payload and the OC-label are located in different spectrum section is proposed. The payload and the OC-label are separated using a fiber Bragg grating (FBG) without any strict timing. The results of the simulation verified the feasibility of the scheme. 相似文献
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A novel architecture of optical code (OC) label generation and recognition for optical packet switching (OPS) by using super structured fiber Bragg grating (SSFBG) is proposed.The OC label is generated and recognized by a label generator and recognizer,respectively.The label generator is composed of N encoders in parallel,and it can generate 2N kinds of serial optical code labels (SOCLs) for indicating 2N network routing information.The label recognizer can decode SOCLs by N decoders in parallel and provides label information to the switching control unit so that clock information is not required during the decoding process.In the switch nodes,handling of the high-speed information payload stream and the recognition of the OC label are performed in the optical domain,while processing of the routing information remains in the electrical domain.This approach could be a promising solution for an OPS network with high capacity,good quality of service (QoS),multi-service function and high security.In this experiment,we demonstrate 40Gbps 256 label optical packet switching that employs clockless SOCL processing. 相似文献
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Multirate payload switching using a swappable optical carrier suppressed label in a packet-switched DWDM optical network 总被引:1,自引:0,他引:1
Gee-Kung Chang Jianjun Yu 《Lightwave Technology, Journal of》2005,23(1):196-202
Optical packets with multirate payloads have been demonstrated for optical label switching (OLS) and transport in a multihop dense wavelength-division-multiplexed (DWDM) optical network with over 200 km fiber and a low-power penalty for the first time. The key functions for label generation, swapping, and switching have been successfully realized. 相似文献
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Yoshima S. Onohara K. Naoya Wada Kubota F. Kitayama K. 《Lightwave Technology, Journal of》2006,24(2):713-722
Optical multicasting employing wavelength division multiplexing (WDM) has a problem with scalability, because the number of multicast members may surpass the number of available wavelength paths. In contrast to the conventional connection-oriented approach, this paper proposes optical code (OC) label switching for multicast networking and experimentally demonstrates this approach. The enabling components are an OC label, on which multicast group information is mapped, and a multicast routing table implemented with a reconfigurable optical matrix switch. This approach mitigates the scarcity of wavelength resources, thus, providing scalable optical multicast networking. 相似文献
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A novel scheme of wavelength conversion based on single semiconductor optical amplifier (SOA) inserted Mach–Zehnder-interferometers
(MZI) is proposed to resolve the optical packet contending in the paper. A signal phase adjuster is designed for MZI lower
arms to change the optical signal phase difference between MZI upper arms and lower arms accurately. The SOA and input optical
signal parameters are discussed and analyzed to optimize the scheme wavelength conversion performance for all-optical switching
networks. Numerical analysis and simulation show that more than 20 dB contrast ratio can be achieved for the wavelength conversion
at 40 Gbps. In addition, the system is simple structure, stable and photonic integratable. 相似文献
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Fiber optic rings are widely deployed in metropolitan area networks (MAN). These rings currently employ architectures and protocols that are neither optimized for nor scalable to the network demand. Therefore, emerging technologies are being pushed to replace the traditional architectures. Among these technologies, optical burst switching (OBS) is an effective and promising technology. In this study, a novel architecture, dual-fiber OBS (DOBS), is proposed. This architecture has similar functions to those of fiber delay lines, partial wavelength conversion and deflection routing. A theoretical model is developed to evaluate the performance of DOBS, which is compared with single-fiber and simple two-fiber schemes by introducing them into ring and mesh MAN in simulations. The results reveal that DOBS can exponentially reduce the burst dropping probability. Moreover, since DOBS can be implement using commercially available devices and dark fibers, it is commercially viable in metro networks. 相似文献
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Y.K. Lize Xiang Liu R. Kashyap 《Photonics Technology Letters, IEEE》2006,18(10):1140-1142
We present and analyze payload/label encoding based on a single Mach-Zehnder modulator, in which the payload is differential phase-shift keyed and the label is amplitude-shift keyed through modulation of either the modulator bias or the amplifier gain. The encoding is analyzed numerically and experimentally. Simultaneous encoding of a 10-Gb/s payload and a 155-Mb/s label is demonstrated with high receiver sensitivities. Penalty-free transmission over 80 km of standard single-mode fiber is achieved for both the payload (with dispersion compensation) and the label (without dispersion compensation). Furthermore, polarization-independent label processing and payload wavelength conversion at intermediate nodes are proposed for potentially cost-effective node operations. 相似文献
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A framework for optical burst switching network design 总被引:2,自引:0,他引:2
We analyze optical burst switching (OBS) systems. The analysis leads to a framework which provides guidelines for OBS design. We identify conditions for OBS feasibility and the relationship between burst size, or equivalently burst assembly delay, and throughput, taking into consideration control packet processing and the number of available wavelengths per fiber 相似文献
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Spectrum handoff (SH) in the cognitive radio network (CRN) is considered as a key challenging area to enhance the performance of secondary users (SUs) in CRN. If the primary user is detected, the SU may pause and stay on the same channel or may perform SH to another idle channel. An accurate and precise handoff decision improves the overall throughput and quality of experience of end-users. In this paper, we introduce a new SH algorithm and continuous short-sensing strategy to improve the overall throughput of SUs. In addition, we have derived the minimum length of the target channel sequence based on network-specific parameters like desired call dropping probability. Further, an optimum channel search time is obtained to minimize the handoff delay. The simulation result shows that the proposed scheme improves the overall throughput of CRN, and the mean opinion score of different video applications increases by 10%, 4.6%, and 1% for rapid motion, gentle walk, and slight motion types of video applications. In the case of VoIP applications, the maximum simultaneous call is improved by 2 times in the case of G.711, 1.72 times in the case of G.729, and 1.66 times in the case of iLBC. 相似文献
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Olmos J.J.V. Monroy I.T. van Berkel J.P.A. Verdurmen E.V.M. Jennen J.G.L. Koonen A.M.J. 《Lightwave Technology, Journal of》2006,24(9):3322-3333
This paper presents a study on intranode impairments and engineering rules for a label switching router supporting intensity modulated (IM) optical payload data signals labeled by using frequency-shift key (FSK) modulation. Engineering rules and design guidelines are presented regarding the choice of system parameters such as IM extinction ratio, FSK frequency deviation, alignment of optical filtering stages, label swapping, and node cascadability. The presented rules are derived from insights obtained from computer simulations and experimental validation for a 10-Gb/s IM payload signal. 相似文献