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基于速率方程建立了线性光放大器(LOA)的数值模型,模拟了线性光放大器的增益钳制特性。与对称结构马赫曾德尔干涉仪(MZI)的传输矩阵相结合,构建了线性光放大器马赫曾德尔干涉仪全光逻辑异或门模型,实现了两路40Gbit/s信号的异或运算。与传统的半导体光放大器(SOA)构成的马赫曾德尔干涉仪型异或门进行了比较,从器件结构上对两种异或门运算结果的差异给出了解释。结果表明,线性光放大器具有平坦的增益特性,对输入信号的扰动具有不敏感性,垂直光场缩短了载流子恢复时间;线性光放大器马赫曾德尔干涉仪结构可以实现异或运算;利用差分相位法可以解决载流子恢复时间对信号处理速度的限制,合理地选择延迟时间能获得较好的运算结果;输出信号具有眼图张开度大、消光比高、峰值啁啾小、对波长变化不敏感等优点。
A numerical model of linear optical amplifier (LOA) is established based on the rate equation, and the gain clamping characteristics of the linear optical amplifier are simulated. Combined with the transmission matrix of the symmetric Mach-Zehnder interferometer (MZI), an all-optical logic XOR gate model of a Mach-Zehnder interferometer for a linear optical amplifier is constructed, and an XOR operation of two 40 Gbit / s signals is achieved. Compared with the Mach-Zehnder interferometer-based XOR gate formed by a traditional semiconductor optical amplifier (SOA), the difference between the two XOR results is explained from the device structure. The results show that the linear optical amplifier has a flat gain characteristic, which is insensitive to the disturbance of the input signal. The vertical optical field shortens the carrier recovery time. The Mach-Zehnder interferometer structure of the linear optical amplifier can realize the exclusive-or operation. The phase method can solve the limitation of the signal processing speed by the carrier recovery time, and the reasonable selection of the delay time can obtain a better operation result. The output signal has the advantages of large eye opening, high extinction ratio, small peak chirp, Sensitive and so on.