Overview of simple knowledge points of optical fiber
What is optical fiber?
The optical fiber is composed of a glass core, a cladding, a coating, an aramid (Kevlar), and an outer sheath. Replace traditional electronic signals with optical pulses for transmission.
Fiber optic transmission overview
Traditional copper core cables are transmitted through electronic signals, and optical fibers achieve the same purpose through optical pulses. Inside the fiber is a transparent glass core, and the glass core is covered with a mirror-like cladding. The light enters the fiber and is continuously reflected by the cladding on the way to the other end of the fiber transmission channel.
Fiber specifications and their differences
Optical fibers are distinguished by their core and cladding diameters, and are marked with "core diameter/cladding diameter". The specifications of multimode fiber are generally 62.5/125 or 50/125 microns, and single mode fiber is generally 9/125 microns.
OM1 62.5/125 and OM2 50/124 multimode optical fibers are more commonly used to connect communication equipment. This type of communication equipment is equipped with an optical fiber transceiver that belongs to an LED (Light Emitting Diode) light source. From the light source, hundreds of patterns are output from the optical fiber.
OM3 and OM4 50/125 10G and even higher-level multimode fiber, the connected fiber transceiver belongs to VCSEL (Vertical Cavity Surface Emitting Laser), compared with the traditional hundreds of modes, there is only one in the fiber Group-specific patterns.