双包层光纤中抽运光吸收的波动理论分析  

Analysis of Absorption of Pump Light Inside Double Clad Fibers Using Wave Theory

作　　者：傅玉青[1] 杨楠[1] 陈建国[1] 

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《半导体光电》2008年第1期79-81,101,共4页Semiconductor Optoelectronics

摘　　要：从波动方程出发,在把双包层光纤等效成大纤芯单包层光纤的条件下,求解了双包层光纤纤芯、内包层、外包层各部分的线偏振模的模场分布,并以此计算内包层的各个LPmx模式在纤芯内的能量与该模式总能量的比值,以及不同模式的泵光的吸收系数。结果表明,用LP0n形式的模式进行抽运可以更有效地被纤芯吸收;在m固定的情况下,高阶模的吸收系数更大。Starting from the wave equations, approximating the core and inner clad as a ＂large core＂, various linearly polarized modes（LPmx） have been specified for a double-clad fiber.Using the derived expression for the modes guided by the inner clad, the fraction energy or the ratio of the mode energy traveling inside the doped fiber core to the total energy of the guided mode has been evaluated, and the absorption coefficients of various inner clad modes, serving to pump the doped core, have been calculated. The results indicate that, by using the LP0n modes,the pump radiation can be absorbed more efficiently, and for fixed m, the absorptions of the higher order modes are larger.

关 键 词：双包层光纤 线偏振模 吸收系数 

分 类 号：TN252[电子电信—物理电子学]