A semi-analytical calculation method of bending loss for large-mode-area fibers with arbitrary refractive-index profile

作者：Liao, Suying^*; Gong, Mali

来源：Optics Communications, 2011, 284(14): 3575-3580.

DOI：10.1016/j.optcom.2011.03.046

• Fiber lasers
• Bending loss
• Large-mode-area
• Mode distortion

Predicting mode-dependent bending loss is important for large-mode-area (LMA) fibers to strip out unwanted modes. In order to seek a reasonable calculation method, a new bending loss formula that allows for both mode field distortion and weaker mode confinement was derived in detail. Based on the formula, a semi-analytical method was introduced to calculate the mode bending loss for LMA fibers. By combining the applications of the finite element method, discrete Fourier transforms and numerical integral, the method is valid for LMA fibers with arbitrary refractive index profile. The obtained loss characteristics are basically consistent with the previous results. This accordance demonstrates the feasibility and generality of the semi-analytical method.

• 出版日期2011-7-1
• 单位中国人民解放军空军空降兵学院; 清华大学