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首页> 外文会议>Conference on Optical Transmission Systems and Equipment for WDM Networking, Jul 29-31, 2002, Boston, USA >Balancing filter distortion and crosstalk impairments in optical networks
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Balancing filter distortion and crosstalk impairments in optical networks

机译：平衡光网络中的滤波器失真和串扰损害

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摘要

The design of optical communication networks with network switching elements operating in the optical domain requires careful system analysis and potentially stringent component requirements. We consider here network elements such as transparent optical cross-connects that demultiplex WDM signals, optically switch individual channels, and then multiplex the wavelengths together again before transmission into the next span. Network element optical impairments that can degrade signal quality are in-band (same wavelength) crosstalk, out-of-band crosstalk, and signal distortion from filter concatenation effects. These impairments can limit the transmission distance of a signal before regeneration is required. We examine the trade-offs between crosstalk and filter distortion in the context of the optical filters used in the optical multiplexers and demultiplexers in the network elements. We demonstrate the balance that must be struck between these impairment types in the design of the filters and network system. We study a 10 Gb/s network with 50 GHz channel spacing, examining both NRZ and RZ modulation formats. In both cases, we find optimal filter bandwidths that minimize the total signal degradation measured in terms of Q penalty. The total penalty suffered by RZ signals is higher than that of NRZ signals and must be considered when estimating system reach.
机译：具有在光域中运行的网络交换元件的光通信网络的设计需要仔细的系统分析和可能严格的组件要求。我们在这里考虑诸如透明光学交叉连接之类的网络元素，这些元素对WDM信号进行解复用，对各个通道进行光交换，然后在传输到下一个跨度之前再次将波长复用在一起。可能降低信号质量的网元光学损伤包括带内（相同波长）串扰，带外串扰以及滤波器串联效应引起的信号失真。这些损害可能会限制信号在需要再生之前的传输距离。我们在网元中的光复用器和解复用器中使用的光滤波器的背景下，研究了串扰和滤波器失真之间的权衡。我们证明了在滤波器和网络系统的设计中必须在这些损害类型之间取得平衡。我们研究了具有50 GHz信道间隔的10 Gb / s网络，同时检查了NRZ和RZ调制格式。在这两种情况下，我们都找到了最佳的滤波器带宽，该带宽可以最大程度地降低根据Q损失测得的总信号衰减。 RZ信号遭受的总损失高于NRZ信号，因此在估算系统范围时必须考虑到这一点。

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