中文摘要：

针对密集波分复用系统在升级过程中对全光纤滤波器的技术要求,构造了一种将2种不同结构的2×2和3×3光纤耦合器按照一定方式级联构成的一种新型光纤滤波器,基于光纤耦合理论和传输矩阵理论,在理论上进行了充分的分析,实现了器件按照不等带宽信道的输出谱图.结果表明：当光纤耦合器分光比和干涉仪臂长差等参量值匹配得当时,能实现在100GHz信道带宽内,同时传输总量为50Gbit/s速率的光信号,大大提高了带宽利用率;器件的输出谱整体满足密集波分复用系统所需的通带宽度和截止宽度.

英文摘要：

In order to meet the dense wavelength division multiplexing system during the upgrade for all fiber filter,an all-fiber different bandwidth Interleaver using one 2×2and two 3×3fiber couplers is developed by using a new configuration.Based on the principle of characteristics of fiber transmissivity and the matrix transfer function,the complex amplitude output spectrum is established and is analyzed in detail.The results indicate that when the length difference value of interference arms and the coupling coefficient of the couplers is at the appropriate value,the transmission rate of 50Gbit/s is utilizated in 100 GHz,and the passband width and cutoff width of the output spectrum satisfy the requirement of DWDM.