Optical fiber is a fiber made of glass or plastic that can be used as a tool for light conduction. The transmission principle is "total reflection of light", optical fiber communication has good characteristics, such as: confidentiality, high capacity, high speed. Therefore, optical fiber is widely used, and there are roughly the following categories:
1.Synchronous Digital Hierarchy(SDH/SONET), such as submarine optical cables between major cities and on the ocean floor;
2.Ethernet (GBE), including the current fiber to the home (FTTH), to the building (FTTB), to the community, etc., mainly to our home and office network;
3.Fiber channel,refers to various storage devices, databases, including the developing cloud computing service system;
4Cable TVtransmission (PIN reception);
5.Other special purpose transmissions, such as aircraft, ships
