Study on the effect of ellipticity and misalignment on OAM modes in a ring fiber

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2018,（3）
• 页码范围: 204-208
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-018-7251-6

摘要

Based on the optical fiber mode theory and employing the expertized software COMSOL,we study the effect of ellipticity and misalignment on the effective refractive indices,walk-off and intensity distribution of the even and odd eigenmodes that form the basis of the orbital angular momentum (OAM) modes in a ring fiber.Our results show that the effective refractive index difference and the walk-off increase with the ellipticity and misalignment,thus reducing the stability of the OAM modes.We find that the misalignment has a greater impact on the OAM modes than the ellipticity,and both the misalignment and ellipticity affect the lower-order OAM modes more significantly,suggesting that the higher-order OAM modes are more stable during propagation.