Optimized Design of Second-Order Tellurium-Based Fiber Raman Amplifier Based on Cooperative Search Algorithm
Recently,with the development of new-generation mobile communication systems,the demand for high data rates and large bandwidth is increasing.In this study,we proposed a second-order Raman fiber amplifier designed with two second-order pumps and four first-order pumps to amplify the C+L full-band signal light using a tellurium-based optical fiber as the transmission medium,which can effectively alleviate optical communication network challenges due to bandwidth growth.First,a simplified second-order Raman coupled wave equation is solved numerically,and then the pumping parameters of the second-order Raman fiber amplifier are optimized using a cooperative search algorithm to improve output performance.Meanwhile,the performance of first-and second-order Raman fiber amplifiers under the same pump parameter configuration is analyzed.Additionally,the influence of two key factors,that is,second-order pump optical power and fiber length on the average output gain and gain flatness of a designed second-order tellurium-based Raman fiber amplifier are investigated.Experimental results show that the average output gain of the designed second-order tellurium-based fiber Raman amplifier is 27.3601 dB and the gain flatness is 0.6601 dB in the ultrawide bandwidth range of 1530-1630 nm.
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