Abstract
With the development of fiber communication technology, the existing operating wavelength band of fiber amplifiers, such as 1530-1560 nm and 1480-1510 nm, may not be satisfied with the growing requirement in many fields. Therefore, this research emphasizes expanding the available band (1800-2000 nm) and maximizing the gain of the thulium doped fiber amplifier at the central wavelength (1900 nm). The study is based on the two-level energy system of thulium ion, which can cover the objective wavelength. According to the related rate equations solved by the symbol function method and power propagation equations solved by the Fourth order Runge-Kutta method, use MATLAB to simulate a fiber amplifier and study the coeffect amplification effect of thulium doped fiber amplifier to 1900 nm signal light. Use the Genetic algorithm to find the best parameters match (fiber length 1m and doping concentration 3.5) when the gain reaches the maximum (27.5 dB). Through optimizing the collocation of parameters, the gain can be maximized.
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