Analysis of beam propagation characteristics in gain-guided, index antiguided fibers with the beam propagation method

作者：Ai, Fei; Qian, Jianqiang^*; Shi, Junfeng; Zhang, Machi

来源：Applied Optics, 2017, 56(29): 8169-8173.

DOI：10.1364/AO.56.008169

• SINGLE-MODE
• CORE

The transmission properties of beams in gain fibers are studied with the complex refractive index beam propagation method (CRI-BPM). The method is checked by comparison with an analytic method. The behavior of a gain-guided, index antiguided (GG-IAG) fiber with different gain coefficients is studied. The simulation results show that the signal can transfer in the fiber with almost no loss when the gain coefficient reaches the threshold of the fundamental mode, and the shape of output spot will have no major changes when the gain coefficient is over the thresholds of high-order modes, even when the mode competition is not obvious. The CRI-BPM can predict the changes in light power and light mode at the same time, and will be very useful in the designing of fiber amplifiers and lasers with complex structures. More factors will be considered in this method to provide reference for practical application in our further research.

• 出版日期2017-10-10
• 单位北京航空航天大学