▎ 摘　　要

NOVELTY - The absorber has a fiber grating provided with a cladding and a core wrapped by the cladding. The fiber core is engraved with a grating. A filling material (12) is provided with nano material (120). A package body is utilized for loading the fiber grated and the filling material. The filling material surrounds the optical fiber grater in the package body. USE - The saturable absorber is useful in an all-fiber laser i.e. full optical fiber self-starting ultra-fast optical fiber laser. ADVANTAGE - The saturable absorber is simple and convenient to prepare; and has high compatibility and stable performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a preparation method of saturable absorber; and a full optical fiber laser. DESCRIPTION OF DRAWING(S) - The drawing shows a structural schematic diagram of a saturable absorber. 10Namely saturable absorber 12Filling material 13Z-axis adjusting frame package 14Ultraviolet curing glue 120Nano material 131Openings