Why Optical Fiber Communication Belongs to Wired Communication

Why Optical Fiber Communication Belongs to Wired Communication

The reason why optical fiber communication belongs to wired communication is that light wave signal transmission is in a special medium, namely optical fiber. Nowadays, the commonly used optical fiber is a kind of glass fiber mixed with special impurities. It is divided into multimode fiber and single-mode fiber. Multimode fiber (such as. 651) is often used in local area networks and is not suitable for long-distance transmission. The single-mode optical fiber used for long-distance transmission is a single-mode optical fiber conforming to ITU-T G 652 standard; Because the dispersion characteristics of optics affect the transmission attenuation performance of light waves, such as G.652C, G 653、G.  655 and other standard optical fibers to adapt to different transmission distance and rate requirements. Optical fiber must be cabled to be used in various occasions, such as: central tube type, layer twisted type and fiber ribbon type; Indoor type and outdoor type; Pipeline/overhead/underwater, air blowing/micro groove and other laying types; Type of core network and access network, etc.

For optical multiplexing technology, only the wavelength division multiplexing (WDM) technology currently used is the real optical multiplexing technology. It is generally divided into dense wavelength division multiplexing (DWIDM) (generally used for ultra long distance and ultra large capacity systems) and sparse wavelength division multiplexing (CWDM) (commonly used for low-cost, medium short distance and equivalent capacity systems, such as MAN). SDH/SONET, on the other hand, defines standard optical interfaces and rich overhead bytes based on the principle of electric time division multiplexing, so that it can realize horizontal compatibility of optical interfaces, flexible add/drop circuits, and optical network management in optical communication.