In　this　paper,　a　fiber-coupled　module　based　on　a　TO-can　green　LD　single-tube　light　source　is　designed.　The　module　adopts　the　fast　and　slow　axis　collimation　method,　to　obtain　the　fast　and　slow　axis　beam　quality　close　to　the　near-circular　collimated　light,　LD　hexagonal　stacking　mode　arrangement,　the　design　of　the　reflecting　prisms　with　parallel　flat　plate　and　light　wedge　beam　shrinking　device　for　the　beam　of　the　spatial　density　row,　effectively　reducing　the　＇dead　zone＇,　so　as　to　take　full　advantage　of　the　optical　fiber　numerical　aperture　to　improve　the　output　brightness　of　the　fiber　coupling.　The　output　brightness　of　the　fiber　coupling　is　improved.　The　simulation　verifies　that　19　green　LDs　with　a　power　of　1.65W　are　coupled　into　a　fiber　with　a　numerical　aperture　of　0.22　and　a　core　diameter　of　50μm,　with　an　output　power　of　30.08W,　a　fiber　coupling　efficiency　of　97.63%,　a　corresponding　luminance　of　10.08MW/(cm2·Sr),　and　a　total　optical-optical　transmission　efficiency　of　the　system　of　95.95%.　©　2023　SPIE　·　0277-786X　·