Patent ID: 9535212
Date: 2017-01-03
CPC Classifications: G02B,H01S

Claim:
1. A single-mode large mode area (LMA) optical fiber that is helically coiled with a preselected bend radius, comprising: a core having a high aspect ratio elongated cross-section and having a first refractive index, wherein the core is narrower in a fast-axis direction and wider in a slow-axis direction, the core including an annular protrusion that is Gaussian in transverse cross-section, and wherein a width of the annular protrusion in the slow-axis direction, an annular extension of the annular protrusion in the fast-axis direction, and the bend radius are selected for single-mode operation; and a cladding surrounding the core, the cladding having a second refractive index different than the first refractive index.