This paper describes the design of a fiber optic network between Bogota and Medellin, whose main objective is to optimize the bandwidth by DWDM technology. The design was done with optical transmission equipment OSN 6800 with the latest technology, which can handle up to 80 wavelengths. Moreover, this network utilizes control nodes and network management software through T2000, which is used in the provision of services in the real optical networks. The most important contribution of this article is its practical character, because it can be used by the readers as a tool to guide the design of optical networks for data transmission, using commercial devices and the key parameters that are considered in any design.