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从线性耦合的非线性薛定谔方程组出发,数值模拟了利用可饱和吸收镜启动多芯光子晶体光纤激光器锁模的建立过程.由于初始自发辐射的随机性,可饱和吸收镜在多个芯中提取的初始脉冲也具有很大的随机性.针对两种脉冲建立的可能初始情况,即只在一个纤芯中先提取出脉冲与同时在多个纤芯中提取出脉冲,对多芯光子晶体光纤作为锁模激光器增益介质的机理进行了详细的模拟.模拟结果表明,要想同时锁定多个纤芯的所有纵模频率,不仅需要纤芯之间具有较强的耦合,而且在可饱和吸收镜提取出的多个初始脉冲时延较大时,在Talbot腔结构下,端镜反射使得各个纤芯出射光束相互交叠也是建立稳定锁模过程必须的.
Starting from the nonlinearly coupled nonlinear Schrödinger equation, the modeling process of a multi-core photonic crystal fiber laser using a saturable absorption mirror is numerically simulated. Due to the random nature of the initial spontaneous emission, the saturable absorption mirror is extracted in multiple cores Of the initial pulse also has a great randomness.For the possible initial situation of the two kinds of impulse to establish, that is only in one core first to extract the pulse and at the same time to extract the pulse in multiple cores, the multi-core photonic crystal fiber As a mode-locked laser gain medium mechanism of a detailed simulation.The simulation results show that, in order to simultaneously lock all the longitudinal mode of multiple core frequency, not only requires strong coupling between the core, but also in the saturable absorption mirror When a large number of initial pulse delays are extracted, under the Talbot cavity structure, the end mirror reflection makes the emergent beams of the respective cores overlap each other and is also necessary for establishing a stable mode-locking process.