The basic concept of optical network
Itself from the optical fiber communication technology development, the optical network is most active in the field. However, the so-called “optical network” is not a strictly technical terms, it is a popular term. Historically, optical networks can be divided into three generations. The first generation of optical networks is used to achieve high-capacity transmission, all the switching, routing and other intelligent power levels are achieved, SDH is this the first generation of optical networks, and is currently