Method and arrangement for the rapid adjustment of the tilt of optical wdm signals

Abstract

An anti-pump laser (AL) is used in addition to a tilt correction pumplaser (KL) for Raman tilt control, said anti-pump laser injecting an anti-pump signal into a transmission fiber (FI) or a dispersion compensation fiber (DCF). The anti-pump laser (AL) has the function of reducing the pump energy of the control pump laser (KL) in the course of the fiber (FI, DCF), in order to restrict its effective length and to enable a faster adjustment of the tilt.

1 . An arrangement for rapid tilt adjustment of a wavelength multiplex signal transmitted over a waveguide optical fiber, the arrangement comprising:
 at least one controlled tilt correction pump laser generating a tilt correction pump signal, which frequency lies outside a transmission band used;   a device for injecting the tilt correction pump signal into the waveguide optical fiber in the opposite direction of the transmission direction of the wavelength multiplex signal;   an insulator or filter inserted in the waveguide optical fiber downstream in relation to the tilt correction pump signal, which blocks the tilt correction signal; and   a measurement and control device at an output of the waveguide optical fiber for determining the tilt and/or level of the wavelength multiplex signal and for controlling the power of the tilt correction pump laser.   
   
   
       2 . The arrangement according to  claim 1 , wherein the fiber optical wave guide contains section of a dispersion compensation fiber and a transmission fiber. 
   
   
       3 . The arrangement according to  claim 2 , wherein the tilt correction pump signal is injected into the dispersion compensation fiber.