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Protection switching schemes of multi-granularity p-cycles in survivable WDM networks 总被引:2,自引:0,他引:2
In this paper, a novel concept of multi-granularity p-cycle is proposed. In conventional p-cycle concept, all on-cycle spans have the same capacity. However, in multi-granularity p-cycle, each on-cycle span could have different capacity. Resnlts show that multi-granularity p-cycles are much more capacity-efficient and cost-effective than conventional p-cycles. We also propose two protection switching schemes for all types of p-cycle networks. One is wrapping protection, in which only two end nodes do real-time switching when a span failure happens. The other is steering protection, in which at most four nodes do real-time switching when a span fails. In steering protection switching scheme, the restoration path for the failure traffic demand has the least hops. 相似文献
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This paper investigates the problem of dynamic protected lightpath services provisioning in optical mesh networks employing wavelength division multiplexing (WDM). A variety of schemes for dynamic protected services provisioning have been proposed, supporting a range of tradeoffs among restoration speed, capacity efficiency, and scalability. In this paper, we propose a novel scheme, called p-cycles-based maximum protected working capacity envelope (PC-MPWCE), which can offer an attractive combination of features: ring-like speed, mesh-like capacity efficiency, and good scalability. To evaluate the performance of PC-MPWCE, we compare it via simulation with 1 + 1 automatic protection switching (APS) and two well-known shared backup path protection (SBPP) on NSFNET. Our simulation results show that PC-MPWCE can achieve much better blocking performance than 1 + 1 APS, and perform the similar blocking performance and capacity efficiency as SBPP. 相似文献
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采用聚碳酸酯模板和电化学沉积法制备基于金纳米棒的Raman场增强衬底, 制备的金纳米棒直径大约36 nm, 长约1 μm, 测试结果显示其共振吸收峰的位置约为540 nm. 比较了谐振和非谐振条件下的场增强情况, 并确定了场增益系数, 结果显示谐振激光激发下的增益比非谐振情况下提高了7.36倍. 本研究相对于前人的工作取得了如下进展: 一是讨论了谐振模式与非谐振模式下的金纳米棒的场增益系数, 利用谐振波长的激光激发金纳米棒, 进一步提高了场增益; 二是消除了聚碳酸酯模板分子的荧光背底, 使其在表面增强 Raman 散射方面的应用进一步变得可行.
关键词:
金纳米棒
表面增强Raman散射
聚碳酸酯模板 相似文献
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In this paper, an inner wavelength method is proposed to enlarge buffering capacity of shared fiber delay line buffers. In addition, an optical packet switch called extended shared buffer type optical packet switch (extended SB-OPS) is proposed to realize the inner wavelength method. In order to further improve performance of extended SB-OPS, a greedy algorithm based on inner wavelength method is introduced. The performance of extended SB-OPS is evaluated by simulation experiments. 相似文献
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We experimentally demonstrate 10-Gb/s format conversion from non-return-to-zero (NRZ) to alternatemark-inversion (AMI) using the linear filtering effect of silicon microring resonator. Our discussion and analysis in simulation further show that a 10-Gb/s AMI signal with good quality can be obtained by a resonator with a notch depth larger than 25 dB when the 3-dB bandwidth is 0.4 nm. 相似文献
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In this paper,a novel concept of multi-granularity p-cycle is proposed.In conventional p-cycle concept,all on-cycle spans have the same capacity.However,in multi-granularity p-cycle,each on-cycle span could have different capacity.Results show that multi-granularity p-cycles are much more capacity-efficient and cost-effective than conventional p-cycles.We also propose two protection switching schemes for all types of p-cycle networks. One is wrapping protection, in which only two end nodes do real-time switching when a span failure happens.The other is steering protection,in which at most four nodes do real-time
switching when a span fails.In steering protection switching scheme,the restoration path for the failure traffic demand has the least hops. 相似文献
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