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为了降低全光波长转换器的转换出错率进而提高输出信号的质量,文章对全光波长转换器的误码率(Bit error rate,BER)进行研究。基于交叉增益调制型(Cross gain modulation,XGM)量子点半导体光放大器(Quantum dot semiconductor optical amplifiers,QD-SOA)的结构建立静态、动态模型,采用牛顿迭代法和四阶龙格-库塔法求解速率方程和光场传输方程来分析后端面反射率、有源区长度、泵浦光功率、从浸润层到激发态的弛豫时间和注入电流密度五个因素对单端耦合下QD-SOA误码率的影响。结果表明,减小后端面反射率,增大注入电流密度,增大有源区长度,减小载流子从浸润层到激发态的弛豫时间,增大泵浦光功率均可减小误码率。为降低波长转换的出错率,提高输出信号的品质,必须选取适当的后端面反射率、有源区长度、泵浦光功率、弛豫时间和注入电流密度。计算显示单端耦合与双端耦合的误码率相差不大,但单端耦合较双端耦合具有制作工艺简单,输入功率动态范围更大的优势,故在一定条件下可选用单端耦合的QD-SOA。
In order to reduce the conversion error rate of the all-optical wavelength converter and improve the quality of the output signal, the bit error rate (BER) of the all-optical wavelength converter is studied. A static and dynamic model was built based on the structure of a cross-gain modulation (XGM) quantum dot semiconductor optical amplifier (QD-SOA). The Newton iterative method and the fourth-order Runge-Kutta Rate equation and light field transmission equation are used to analyze the QD-SOA QD-SOA errors under the single-ended coupling, including the reflectivity of the back face, the length of the active region, the power of the pump, the relaxation time from the wetting layer to the excited state and the injection current density Rate of impact. The results show that reducing the reflectivity of the rear face, increasing the injection current density, increasing the length of the active region, reducing the relaxation time of the carrier from the wetting layer to the excited state and increasing the pump power can all reduce the error Bit rate. In order to reduce the error rate of wavelength conversion and improve the quality of the output signal, we must select appropriate backface reflectivity, active region length, pump power, relaxation time and injection current density. The calculation shows that the error rate of single-ended coupling and double-ended coupling are similar, but single-ended coupling has the advantages of simple manufacturing process and larger dynamic range of input power than the double-ended coupling. Therefore, under certain conditions, single-ended coupling QD-SOA.