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.