We　propose　a　scheme　for　realizing　the　beam-splitter-type　coupling　between　two　cavity　modes.　In　the　scheme　a　collection　of　A-type　three-level　atoms　are　coupled　with　the　two　cavity　modes　with　large　detunings.　Under　certain　conditions,　the　effective　Hamiltonian　for　the　cavity　modes　describes　the　frequency-up　conversion,　which　is　decoupled　with　the　atomic　system.　The　effective　coupling　strength　increases　with　the　number　of　the　atoms,　which　allows　the　procedure　to　be　completed　in　a　reasonable　time.　The　atoms　have　no　probability　of　being　populated　in　the　excited　states　and　thus　the　scheme　is　insensitive　to　atomic　spontaneous　emission.　(c)　2007　Elsevier　B.V.　All　rights　reserved.