Patent ID: 9739937
Date: 2017-08-22
CPC Classifications: G02B,H01S

Claim:
1. An elliptical cladding polarization-maintaining large-mode-area gain fiber, comprising: a core of the elliptical cladding polarization-maintaining large-mode-area gain fiber, which comprises a silica glass doped with a gain matter and has a first refractive index; an inner cladding, which surrounds the core and has a second refractive index smaller than the first refractive index; an elliptical stress layer, which surrounds the inner cladding, has a third refractive index smaller than or equal to the second refractive index and has an elliptical cross-sectional shape; a first outer cladding, which surrounds the elliptical stress layer and has a fourth refractive index smaller than or equal to the third refractive index; a second outer cladding, which surrounds the first outer cladding and has a fifth refractive index smaller than the fourth refractive index; and a third outer cladding, which surrounds the second outer cladding and has a sixth refractive index greater than the fifth refractive index.