In point-to-point topological structure, the equipment multiplexes several times of the original bandwidth with limited optical fiber resources to realize the two-way convergence between the two points, which greatly improve the capacity of the optical fiber. On the tansmitting terminal,a WDM equipment firstly polymorizes the prepared information of different wavebands. On the receiving terminal, another WDM equipment distributes the polymorized information to different bandwidth. It can facilitate the backbone network cabling, expands the bandwidth, and accelerates the speed of transmission. Equipped with our one-way NIC, the solution will be widely applicated in the realms of network security and national defense construction, which effectively ensure the information security.