We　proposed　a　new　structure　in　which　several　active　regions　are　seriously　connected　by　tunnel　junction　and　coupled　to　form　a　large　optical　cavity.　This　new　laser　can　give　high　optical　power　at　low　injecting　current.　The　optical　power　density　at　the　facet　can　be　greatly　reduced　for　the　coupled　large　optical　cavity,　thus　COD　is　overcome　and　the　laser　beam　quality　is　improved.　The　new　high　power　980　nm　lasers　with　4　active　regions　seriously　connected　are　fabricated.　An　optical　power　output　of　5　W　at　2　A　injection　level,　Ith　of　172　mA,　differential　efficiency　of　3.24　W/A,　and　Jth　of　273　A/　cm2　are　obtained.