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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 >Current Developments and Future Perspective on Technologies for System Impairments and Compensations
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Current Developments and Future Perspective on Technologies for System Impairments and Compensations

机译：系统损害和补偿技术的当前发展和未来展望

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Due to increasing traffic demands telecommunication operators have to upgrade the transmission capacity of their networks. Since the success story of WDM in optical fiber based networks, component and system manufacturers as well as operators are dealing with the question if it is better to increase the number of WDM channels remaining at low channel bitrate or to enhance the channel line rate itself. The momentary situation is that already 10 Gbit/s based systems are installed for client traffic and are running properly. By a comparison of the technical advantages and business cases for a lot of transmission scenarios, the 10 Gbit/s solution turns out to be the preferable solution if compared to 2.5-Gbit/s-based systems. In the meantime 40GHz electronics has made severe progress so that now it seems to be possible to take the step towards the next hierarchy, the 40 Gbit/s channel rate. Nevertheless, many system manufacturers still wait with the market introduction of 40 Gbit/s, on the one hand because we observe a stagnant capacity demand this year, and on the other hand because the business case seems yet not to be competitive. One of the reasons for this is the impact of different physical limitations of fast optical fiber transmission. While the step from 2.5 to 10 Gbit/s still did not raise severe technological problems for medium distances, this is completely different for ultra long haul systems and especially for all 40-Gbit/s-based systems. While nonlinear effects still can be sufficiently managed, phenomena like, e.g., polarization-mode dispersion (PMD), chromatic dispersion mismatch, and gain tilt of optical amplifiers play an important role. Chromatic dispersion and polarization effects may vary with time so that either passive or adaptive compensation schemes may be needed in order to realize sufficiently long transmission distances. This paper will deal with different current solutions to overcome limitations from fibers and components, namely the use of special modulation formats, the use of passive compensation phenomena, the implementation of adaptive electronic or optical compensation schemes, forward-error correction (FEC), inverse multiplexing, or alternatively the use of novel fibers with better transmission characteristics. The paper will present different approaches and will try to give answers to find adequate solutions from technical and business case point of view.
机译：由于业务量需求的增加，电信运营商不得不升级其网络的传输容量。由于WDM在基于光纤的网络中的成功故事，因此组件和系统制造商以及运营商都在解决以下问题：增加留在低信道比特率的WDM信道数目还是提高信道线路速率本身是更好的选择。暂时的情况是，已经安装了基于10 Gbit / s的系统来处理客户端流量，并且系统运行正常。通过比较许多传输方案的技术优势和业务案例，与基于2.5 Gbit / s的系统相比，10 Gbit / s的解决方案被证明是首选的解决方案。同时，40GHz电子设备取得了长足的进步，因此现在似乎有可能迈向下一个层次，即40 Gbit / s的信道速率。尽管如此，许多系统制造商仍在等待40 Gbit / s的市场推出，一方面是因为我们观察到今年的容量需求停滞，另一方面是因为业务案例似乎还没有竞争力。原因之一是快速光纤传输的不同物理限制的影响。从2.5 Gbit / s到10 Gbit / s的升级仍然没有对中距离带来严重的技术问题，但是对于超长距离系统，尤其是对于所有基于40 Gbit / s的系统，这是完全不同的。虽然仍然可以充分管理非线性效应，但是诸如偏振模色散（PMD），色散不匹配和光放大器的增益倾斜之类的现象起着重要的作用。色散和偏振效应可能随时间变化，因此可能需要无源或自适应补偿方案，以实现足够长的传输距离。本文将探讨不同的当前解决方案，以克服光纤和组件的局限性，即使用特殊的调制格式，使用无源补偿现象，实施自适应电子或光学补偿方案，前向纠错（FEC），逆复用，或者使用具有更好传输特性的新型光纤。本文将介绍不同的方法，并尝试从技术和业务案例的角度给出答案，以找到适当的解决方案。

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