The fine fiber is encapsulated in the plastic sheath so that it can be bent and not broken. Generally, the launch device at one end of the fiber uses the light pulse to send the light pulse to the fiber with the Light Emitting Diode (LED) or a laser.

In daily life, due to the loss of light in the light guide fiber than the loss of electricity in the wires, optical fibers are used as long -distance information transmission.

Usually the noun of the fiber and optical cables will be confused. Most fiber must be covered by several layers of protective structures before use. The rear -over cable is called the optical cable. Damage, such as water, fire, electric shock, etc. The optical cables are divided into: optical fiber, buffer layer and covering. Fiber and coaxial cables are similar, but there is no mesh shielding layer. The center is the glass core spread.

In the multi -mode fiber, the diameter of the core is 15 μm ~ 50 μm, which is roughly comparable to the thickness of the human hair. The diameter of the single -mode fiber core is 8 μm ~ 10 μm. A glass cover with a lower refractive index is surrounded by a glass cover to keep the light in the core. The outside is a thin plastic jacket to protect the cover. Optical fiber is usually tied into a bundle, with shell protection outside. The core of the fiber is usually a two -layer concentric cylinder with a small cross -sectional area made of quartz glass. It is crispy and easy to break, so it needs to add a protective layer.