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Compact Wavelength Division Multiplexer Based on Microstrip Resonator Containing Effective Zero-Index Media
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A compact wavelength division multiplexer (WDM) based on a microstrip resonator containing effective zero-index media is proposed. Both numerical simulations and microwave experiments demonstrate the crosstalk suppression phenomenon in this WDM. By properly adjusting the values of lumped elements, it is convenient to achieve crosstalk suppression over 10dB. Therefore, this compact WDM is promising for applications in modern microwave communication systems for its compact device volume and unique capability to suppress the crosstalk between WDM channels. 相似文献
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A Novel Bi-wavelength Method for Accurately Measuring Gain and Noise Characteristics of an Erbium-Doped Fibre Amplifier for Multi-Channel Wavelength Division Multiplexing Transmission 总被引:1,自引:0,他引:1
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Gain and noise figure (NF) are the most important two parameters of an erbium-doped fibre amplifier (EDFA) for a multi-channel wavelength division multiplexing (WDM) transmission system. A simple bi-wavelength method for accurate gain and NF spectrum measurement of EDFA for WDM applications is proposed. A saturating input signal, whose power equals to the sum of all the WDM signal power and whose wavelength is determined by the channel numbers and the wavelength of the WDM input signals, saturates the EDFA in a degree as the same as the WDM signals input. Meanwhile, a small power probe signal scans and measures the gain and the NF value at every wavelength of the WDM input signals. Investigative results by numerical simulation show that the gain and the NF spectra measured by this method have good agreement with the real spectra of the WDM signal input in a large total input power range. The maximum errors of the gain and the NF are less than 0.2 dB and 0.16dB, respectively, for a 50-channel input case. The method is competent for the accurate gain and the NF spectrum measurement of the fibre preamplifier and the line-amplifier for WDM applications and has the advantages of simplicity, convenience and easy implement. 相似文献
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为了简化多波长光分组交换系统的发送端结构,提出了一种基于马赫-曾德尔延时干涉仪(MZDI)器件实现多波长双二进制载波抑制归零码(DCS-RZ)格式的光分组产生方法。该方法采用单个MZDI器件将波分复用(WDM)差分相移键控(DPSK)净荷信号转换成WDM DCS-RZ净荷信号,同时完成WDM非归零码(NRZ)标签与净荷信号的耦合,得到WDM DCS-RZ光分组信号。通过4×40 Gb/s DCS-RZ光分组信号产生、传输和分离仿真实验,验证了方法的可行性。仿真结果表明:240 km光纤传输后,净荷在经过法布里-珀罗(F-P)滤波器分离后接收灵敏度仅下降1.8 d B。 相似文献
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为了简化多波长光分组交换系统的发送端结构,提出了一种基于马赫-曾德尔延时干涉仪(MZDI)器件实现多波长双二进制载波抑制归零码(DCS-RZ)格式的光分组产生方法。该方法采用单个MZDI器件将波分复用(WDM)差分相移键控(DPSK)净荷信号转换成WDM DCS-RZ净荷信号,同时完成WDM非归零码(NRZ)标签与净荷信号的耦合,得到WDM DCS-RZ光分组信号。通过4×40 Gb/s DCS-RZ光分组信号产生、传输和分离仿真实验,验证了方法的可行性。仿真结果表明:240 km光纤传输后,净荷在经过法布里-珀罗(F-P)滤波器分离后接收灵敏度仅下降1.8 d B。 相似文献
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The performance of normalized throughput in wavelength division multiplexing (WDM) based coherent time-spreading optical code division multiple access (TS-OCDMA) system is studied. The upper bound and lower bound of normalized throughput are obtained with 8 wavelength channels and 127-length Gold code, and with 4 wavelength channels and 511-length Gold code respectively. It is shown that when all simultaneous users are equally allocated to different wavelength channels, WDM+TS-OCDMA has much better performance. However, if there is no central control to allocate wavelength channels equally, WDM+TS-OCDMA system has the in-between performance of normalized throughput. 相似文献
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光通信系统设计中波分解复用器是分离光信号的一种关键部件,用于分离光信号的微型谐振器特性直接关系到波分复用(WDM,wavelength division multiplexing)解复用系统的工作性能。在二维光子晶体中逐步优化设计了基于光子晶体方形谐振器(PCSR,photonic crystal square resonator)的单信道WDM解复用结构,借助于耦合模理论(CMT,coupled-mode theory)定性分析了波导与谐振腔结构的电磁波耦合相互作用,并用时域有限差分法(FDTD,finite-difference time-domain)数值模拟了其结构工作特性。结果表明:基于PCSR设计的单输出端口WDM解复用结构在设计的参数范围中具有单谐振峰、中心波长宽调谐范围(1 501.4 nm~1 591.0 nm)、通带带宽窄(3.3 nm~9.1 nm)的特性。该结构可应用于WDM解复用光通信系统设计和光路集成设计等方面。 相似文献
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在波分复用(WDM)孤子通信系统中,不同信道的孤子由于载波频率不一样而会发生周期性的碰撞,碰撞将引起孤子到达接收端时间的移动,这个现象限制着邻近信道的最小频率间隔和可以被复用的最大频率范围,即决定了WDM孤子通信系统的最大通信容量。 相似文献
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由于WDM网络中的传输和交换是以波长为粒度进行的。因此波长分配算法就成为光网络的研究热点。有效的算法可大大提高波长的利用率,并可充分挖掘WDM的带宽资源。介绍了WDM全光网络中静态和动态波长分配算法,尤其是结合大型网孔网络详述了几种动态波长分配算法。针对波长变换器在全光网络中的应用。提出了一种可以解决任意类型光网络的分层图算法,它可以一次性解决路由选择和波长分配问题,大大提高了该算法的效率。是未来光网络中非常有前景的一种波长分配算法。 相似文献
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Tunable wavelength routers (TWRs) for multiple wavelength selection are key devices in dynamic wavelength-routing wavelength division multiplexing (WDM) networks. In this paper, by cascading conventional 2×2 TWRs, a new 1×K TWR is proposed for large-scale dynamic wavelength-routing WDM networks. When the cascading numbers are smaller, the 1×K TWR can be directly applied to networking WDM networks. When the cascading numbers are larger, the 1×K TWR can be carried out by the integrating method and be extensively used to networking various multi-wavelength optical networks by the way of “EDFA+TWR”. Though the cascading method proposed is based on the acousto-optic TWRs, it can be also applied to cascading other kinds of TWRs. 相似文献