Abstract

Due to an increase of transmission capacity demand, mainly driven by the Internet, cost effective solutions for upgrades of fibre network capacity are required. Actually there are different trends to increase the capacity per fibre e.g. by adding new wavelength channels to WDM systems, by advanced modulation formats1 and/or novel wavelength allocation schemes2,3 to increase the spectral efficiency and by adding new transmission windows.4,5 Record results of more than 10 Tbit/s in one fibre have been achieved especially by applying latest 40 Gbit/s Electronic Time Division Multiplexing (ETDM) together with massive use of Dense Wavelength Division Multiplexing (DWDM) technology.4,5

© 2002 Optical Society of America

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