共查询到20条相似文献,搜索用时 15 毫秒
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This paper reports a review of the different technologies used for wavelength conversion in wavelength-division multiplexed networks. The strengths and the weaknesses of the competing technologies, including optoelectronic wavelength conversion, four-wave mixing, difference frequency generation, cross-gain and cross-phase modulation in semiconductor optical amplifiers, are stressed with regard to conversion speed, transparency and regeneration of the converted signal. 相似文献
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An all-optical wavelength converter with a large wavelength hopping range is proposed and demonstrated. This converter consists of multistage cascaded wavelength converters using semiconductor optical amplifiers each with different gain band. Each of the cascaded wavelength converters enables us to perform both noninverted (NIV) and inverted (IV) operations. Conversion performance is compared at NIV and IV operations in terms of static characteristics as a function of input/output power of the converter. While good conversion performances are achieved at both operations, the IV wavelength conversion has better cascadability to obtain a high-quality converted signal for the cascaded scheme. Moreover, signal amplitude regeneration is demonstrated by repeating the IV wavelength conversion. Finally, we successfully demonstrate, for the first time, ultrawideband wavelength conversion, including over 300-nm wavelength hopping to the shorter wavelength side with a triple-stage cascaded wavelength converter 相似文献
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《Photonics Technology Letters, IEEE》2008,20(17):1458-1460
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Phase-regenerative wavelength conversion is demonstrated experimentally. The simultaneous combination of two nonlinear optical processes, phase conjugation and frequency conversion (Bragg scattering), produces phase-sensitive gain at two new idler wavelengths in addition to the original signal wavelength. This single-stage approach does not require phase-locking of the tunable pump. At maximum pump depletion, amplitude and phase regeneration occur simultaneously. 相似文献
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分析了全光波长变换器的几种方案,阐述了各自的优缺点,指出利用级联二阶非线性光学晶体的波长变换方案是目前的发展趋势。 相似文献
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本文研究了波长转换范围受限全光网中的动态路由和波长分配问题,提出了一种固定备选路由条件下新的路由和波长分配算法.算法引入了波长相关性的概念,用波长关联权值定量描述了各路由的前后链路上不同波长之间的相互依赖关系.在建立连接时首先使用那些依赖性强,对其他路由影响小的波长,从全局的角度出发选择最优的路由和波长分配方案.计算机仿真表明,本文算法能够适用于稀疏网络和网状网,在均匀业务强度或者大部分业务量来自于长跳路由的情况下,本文算法能够显著降低网络阻塞概率和使用的波长转换器数目,有效提高系统性能. 相似文献
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混合光波长转换在波分复用光网络中的应用 总被引:2,自引:2,他引:2
在全光网络中,如何合理利用波长转换来降低光网络的阻塞率是一个非常关键的问题。研究了最新的波长转换体系结构和波长转换手段,提出一种全新的混合波长转换方法,在减少网络中波长转换器个数的同时,维持拥塞概率类似于全波长转换。提出了5种不同的波长转换器使用策略,并利用数值模拟的方法,比较了这5种不同的波长转换器使用策略,分析结果,得出了最小化光网络的阻塞概率的波长转换使用策略。结合混合波长转换和波长转换器使用策略,进一步提出了光网络中优化波长转换器配置的遗传算法,通过对14个节点的美国自然科学基金网(NSF Net)的数值模拟,结果表明它是十分有效的,在减少光网络中波长转换器数量,且不增加光网络波长数量的情况下,基本保持原有网络性能。 相似文献
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Efficient Wavelength Assignment Algorithms for Light Paths in WDM Optical Networks With/Without Wavelength Conversion 总被引:1,自引:0,他引:1
Shen Gangxiang Bose Sanjay K. Cheng Tee Hiang Lu Chao Chai Teck Yoong 《Photonic Network Communications》2000,2(4):349-359
In order to reduce the overall wavelength number required in a wavelength division multiplexing (WDM) network with static traffic loading, new heuristic algorithms for wavelength assignment are proposed in this paper. A new parameter called one-wavelength-decrease cost is defined and used to compare the efficiency of these algorithms. Comparative simulation studies have been carried out for various network topologies to investigate the effectiveness of the proposed algorithms. 相似文献
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数值模拟了增益钳制SOA(GC-SOA)的波长转换过程,分析了GC-SOA实现波长转换的原理.首次发现了GC-SOA波长转换中类似接通延迟的现象,这种现象将限制GC-SOA在高速波长转换中的应用. 相似文献
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Taehan Lee Kyungchul Park Jaekyung Yang Sungsoo Park 《Communications Letters, IEEE》2007,11(11):898-900
We consider the multicast routing and wavelength assignment (MC-RWA) problem on WDM bidirectional ring networks without wavelength conversion. We give an integer programming formulation of the problem and propose an algorithm to solve it optimally. The algorithm is based on column generation and branch-and-price. We test the proposed algorithm on randomly generated data and the test results show that the algorithm gives optimal solutions to all of the test problems. 相似文献