高功率双包层Er^(3+)/Yb^(3+)共掺光纤放大器的动态响应(英文)

Dynamic response of high-power Er^(3+)/Yb^(3+) co-doped double-clad fiber amplifiers

基于速率方程的离散算法,分析了双包层Er3+/Yb3+共掺光纤放大器的动态响应,显示了输出功率和增益的动态特征。当单个脉冲注入放大器时,输出脉冲的峰值功率不仅依赖于输入脉冲的峰值功率,而且依赖于泵浦功率;当脉冲序列注入时,输出脉冲的功率和增益最终将收敛于它们的稳态值。在双信道情况下,输入脉冲重叠时的输出功率和增益变得更陡峭。在连续波泵浦下,反向自发辐射输出功率(ASE-)首先快速地增加到峰值功率,然后单调下降到稳态值;在脉冲波泵浦下,反向自发辐射输出功率(ASE+)与光纤长度成反比,而ASE-与光纤长度成正比。

Based on discrete algorithm of rate equations, the dynamic response of Er^3＋/Yb^3＋ co-doped double-clad fiber amplifier was analyzed. The dynamic characteristic of output power and gain was shown. When single pulse is injected into the amplifier, the peak power of output pulse depends on the powers of both input peak pulse and pump. When a train of pulse is injected, the output power and gain will gradually converge to their dynamic equilibrium value. In the condition of two-channel, when input pulses overlap, the output power and gain become steeper. Under continuous wave pumping, backward amplified spontaneous emission output power （ASE-） rapidly increases to peak value, and then decreases monotonically to steady-state value. Under pulse wave pumping, forward amplified spontaneous emission output power （ASE＋） is in inverse proportion to the fiber length, whereas ASE- is in proportion to the fiber length.