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针对在两段掺铒光纤中插入滤波器实现宽带 (35nm)增益平坦的滤波器透过谱的设计问题 ,提出了一种新的迭代算法。其原理是利用放大器的均匀展宽特性和级连放大器自动增益补偿的特性。在每次迭代中 ,都取要求带宽内增益 (分贝数 )的平均值为参考轴 ,在增益比该轴高的波长范围内再附加一与增益谱反对称的损耗谱。而增益低于参考值的波长处则会得到自动的增益补偿。模拟计算结果表明 ,用该方法得到的滤波谱能使放大器的增益平坦在原放大器可能得到的最高增益水平 ,同时因滤波器的引入带来的噪声特性恶化也最小。
A new iterative algorithm is proposed for the design of the transmission spectrum of a filter with wideband (35nm) gain flatness by inserting a filter in two erbium-doped fibers. The principle is to use the amplifier’s uniform broadening characteristics and cascaded amplifier automatic gain compensation characteristics. In each iteration, take the average gain (in decibels) of the required bandwidth as the reference axis and add a loss spectrum that is inversely symmetric to the gain spectrum in the wavelength range above the gain. Gain below the reference wavelength will get automatic gain compensation. The simulation results show that the filter spectrum obtained by this method can flatten the gain of the amplifier at the highest possible gain level of the original amplifier and at the same time minimize the noise characteristics due to the introduction of the filter.