Method and apparatus for determining maximum gain of raman fiber amplifier

An apparatus for determining a maximum gain of a Raman fiber amplifier, characterized in comprising:

• at least one processor;
• and
• a memory in communication with the at least one processor, the memory having instructions stored therein, and the instructions, when executed by the at least one processor, causing the at least one processor to perform following steps:
• obtaining transmission performance parameters of a current optical fiber transmission line, the transmission performance parameters including a distance between the joint and the pump source, a fiber loss coefficient, and a fiber length;
• looking up the relationship between the maximum Raman gain and the joint loss Attpoint[i], the relationship between the maximum Raman gain and the joint loss AttCoefficient[j], and the relationship between the maximum Raman gain and the fiber length according to the distance between the joint and the pump source, the fiber loss coefficient, and the fiber length included in the transmission performance parameters to obtain a maximum gain impact factor A1, a maximum gain impact factor A2, and a maximum gain impact factor A4, respectively;
• calculating a 0 km joint loss AttAeff equivalent to a joint loss caused by the mode field diameter of the fiber in the current fiber transmission line according to the distance between the joint and the pump source and the fiber loss coefficient, and looking up the relationship between the maximum Raman gain and the joint loss Attpoint[k] according to the joint loss AttAeff to obtain a maximum gain impact factor A3;
• and
• determining the maximum gain Gmax_factual which the Raman fiber amplifier can actually achieve according to the impact factors A1, A2, A3, and A4,
• wherein a relationship between the maximum Raman gain and a 0 km joint loss Attpoint[i] equivalent to a joint loss at different positions of one or more types of fibers, a relationship between the maximum Raman gain and a 0 km joint loss Attcoefficient[j] equivalent to a joint loss caused by a loss coefficient of the fibers, a relationship between the maximum Raman gain and a 0 km joint loss AttAeff[k] equivalent to a joint loss caused by a mode field diameter of the fibers, and a relationship between the maximum Raman gain and a fiber length are pre-determined, where i is a distance from a joint to a pump source, j is the loss coefficient of the fibers, and k is the mode field diameter of the fibers.