Optical Fiber Cable are thin long (km) strands of ultra pure glass (silica) or plastic that can transmit light from one end to another without much attenuation or signal Loss (dB). “The glass used to make Optical Fiber is so pure that if the Pacific Ocean was filled with this glass then we would be able to see the Ocean bottom form the surface..!!”---Deepest point called Marina Trench, Pacific Ocean is all of just 13km deep.....!!! This is believed to be a repeater distance on long haul routes for Optical Fiber vary between 50 to 150 km.