4-Core Single mode Fiber Optic Cable also called 4-core Optical fiber cable,is a type of communications optic cable which has the same transmission speed as light. They are used to connect final user to FTTH or GPON line. Single mode fiber optic cable is made up of a small diameter glass or plastic core surrounded by cladding, which is a layer of reflective material. This small diameter core, typically around 9 microns in diameter, allows only one mode of light to pass through, resulting in a narrower beam of light. A fiber optic cable (frequently shortened to “fiber cable”) is a specialized transmission medium crafted to carry data as light pulses through ultra-thin strands of glass or plastic known as optical fibers. Although they can do the same job in some instances, the different construction methods make each of them better suited to certain tasks and budgets. Since most network hardware uses a "Duplex" system (requiring two fibers: one to Transmit and one to Receive).
[PDF Version]