Fiber optical system with Raman tilt control

摘要

A fiber optical system ( 1 ) for transmitting an optical signal comprises an optical fiber line ( 2 ) with a plurality of optical fiber spans ( 3 ) interconnected by a plurality of optical amplifiers ( 4 ). Each optical amplifier ( 4 ) comprises: At least one variable optical attenuator ( 5 ) generating a gain tilt of the amplification of the optical signal, a Raman tilt determining device ( 6 ) for determining a Raman tilt induced in the fiber span ( 3 ) following the optical amplifier ( 4 ), and a dynamic controller ( 7 ) connected to the variable optical attenuator ( 5 ) and to the Raman tilt determining device ( 6 ) adjusting the gain tilt such that the Raman tilt is compensated for.