Control method of second-order Raman optical fiber amplifier based on first-order Raman

The invention discloses a control method of a second-order Raman optical fiber amplifier based on first-order Raman, wherein the second-order Raman optical fiber amplifier comprises a 14XX Raman unit and a 13XX Raman unit. Setting of pump starting conditions of the 14XX Raman unit includes determining whether 15XX incoming light exceeds a 14XX pump starting threshold and whether no other alarm volume that leads to pump stop exists; a control process of the 14XX Raman unit comprises the following steps: determining whether a 14XX reflectivity exceeds a threshold, and shielding a reflection coefficient alarm when 13XX power exceeds a 14XX detection threshold; and setting of pump starting conditions of the 13XX Raman unit includes determining whether 14XX optical power exceeds a 13XX pump starting threshold and whether any other alarm volume that leads to pump stop exists. The control method of the second-order Raman optical fiber amplifier based on the first-order Raman disclosed by the invention organically in