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A Mixed Line Rate optical network is a good candidate for a core backbone network because of its ability to provide diverse line rates to effectively accommodate traffic demands with heterogeneous bandwidth requirements. Optical amplification has increased the reach of long-haul optical links. Nevertheless, it is impossible today to construct a truly optical network without converting optical signals to electrical signals and regenerating them, because of the deleterious effects of physical impairments. Thus there is a maximum transmission reach for optical signals before they have to be regenerated. Being expensive devices, regenerators are expected to be sparsely located and used in such a network, called a translucent optical network.
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