An improved definition of divergence half-angle for the far-field of fiber

作者：Li, Lianhuang^*; Guo, Fuyuan

来源：Optik, 2012, 123(4): 283-285.

DOI：10.1016/j.ijleo.2011.04.003

• Fiber optics
• Gaussian approximation
• Divergence half-angle

Firstly, the diffraction far-field of single-mode fiber is investigated and why it can be approximated by a Gaussian function is analyzed according to the characteristic of beam propagation factor. Then, through researching matching efficiency between the far-field and Gaussian field, an improved definition of divergence half-angle is presented according to the equivalent matching efficiency method and an expression is given based on waveguide parameters; furthermore, a formula of the equivalent matching efficiency divergence half-angle as function of normalized frequency is introduced for the convenience of calculation and the results show that it has a high precision within a reasonable parameter range.

• 出版日期2012
• 单位福建师范大学