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In WDM transmission systems, increasing the channel rate from 10 Gbit/s to 40 Gbit/s is beneficial in terms of capacity only if the spectral efficiency is increased with respect to that of state-of- the-art 10 Gbit/s equipment.1–3 This can simply be achieved through ultra-narrow optical filters. Indeed, the four times larger channel bandwidth at 40 Gbit/s makes possible spectral reshaping using current filter technologies.
© 2002 Optical Society of America
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