optical fiber is a thin cylindrical fiber made from glass or plastic, as tiny as one tenth of a human hair. A typical optical fiber for telecom is composed of three cylindrical layers, counted inside out the fiber core (diameter 8~10um) as well as the cladding (diameter of 125um) as well as buffer layer (diameter 900um).Fiber core and cladding are made from glass or silica. The fiber core and the cladding...