The width of an ultra high-power laser diode is greater than 50 £gm and more than 20 times of low-power laser diode.The core diameter of Erbium Doped Fiber Amplifier fiber (EDFA) is 4~6 £gm and it is a single-mode fiber (SMF).However¡Athe ultra high-power laser diode is multi-mode laser. Therefore¡Athe mismatch between high-power laser and SMF resulting in low coupling efficiency. We improve coupling efficiency by using a wedge-shaped graded-index fiber (GIF) tip spliced to a SMF then fused a fiber bragg grating (FBG) to form an external cavity laser. The GIF is a focusing action like a graded-index fiber. From near-field pattern (NFP)¡Awe find the best GIF length is 400 £gm. The coupling efficiency between ultra high-power laser diode and wedge-shape lensed fiber is only 5% .