Learn in the textbookInternet Connection Services and Telecommunications Carriers
DefinitionOptical communication (光通信) is a method that converts electrical signals into light and sends it through optical fiber (光ファイバ).
ExplanationOptical fiber is a thin strand made of glass or similar material. Signals weaken less in it than in copper wire and electrical noise affects it less, so it suits high-speed, high-capacity transmission.
AnalogyInstead of shouting to someone far away, imagine signaling with a flashlight. Light reaches a long way, and faster flashes carry more information.
Memory hookFTTH stands for Fiber To The Home. Fiber here is the same word as the ファイバ in 光ファイバ.