Patent ID: 7164816
Filing Date: 2007-01-16
Classification: B82Y,G02B,G02F,H04J,H04Q

Abstract:
1. A telecommunications system, comprising: a single mode optical fiber carrying wave division multiplex (WDM) traffic, a transmission fiber coupler for coupling signals from channels to be added to the single mode optical fiber, coupling means for connecting the channels carrying the signals to be added to an input of an optical amplifier, the amplifier having an output connected in series to the transmission fiber coupler by a switchable multiband band-stop filter operative for passing low loss only signals having a wavelength of a signal or signals to be added to the WDM traffic, and for attenuating all signals at wavelengths not having the wavelength of the signal or signals to be added to the WDM traffic, and the band-stop filter being operative for attenuating signals which are generated as a result of amplified spontaneous emission (ASE).