System performance prediction method and apparatus

A transmission system performance prediction method, including:

• calculating, by a processor in an apparatus, at least one second noise component at a second power according to a first power of a signal and at least one first noise component generated by the transmission system at the first power;
• and
• calculating, by the processor in the apparatus, the transmission system performance at the second power according to at least one second noise component;
• wherein the first power includes a first base channel calibration power and a first neighboring channel calibration power, and the second power includes a second base channel power and a second neighboring channel power;
• and
• wherein, the calculating at least one second noise component at the second power according to the first power of the signal and at least one first noise component at the first power includes one of:
• taking, by the processor in the apparatus, a product of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is a linear noise component;
• taking, by the processor in the apparatus, a product of a power of three of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is an optical fiber transmission intra-channel nonlinear distortion, taking a product of a square of a ratio of the second neighboring channel power to the first neighboring channel calibration power and a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is an optical fiber transmission inter-channel nonlinear distortion, and taking a product of a power of α of a ratio of the second base channel power to the first base channel calibration power and the first noise component as the second noise component when the first noise component is a receiver noise;
• where, α is not 1 and 0;
• and
• taking, by the processor in the apparatus, the first noise component as the second noise component when the first noise component is a constant noise component.