what are differences of bare fiber,loose tube and tight buffer tube

by www.fiber-mart.com
Bare fiber
 
From the fiber production process, which the composition of the fiber from the inside out: the core, cladding, a coating, and secondary coating. Optical signals in optical fibers are using light of the principle of total reflection. The glass fiber is the main channel of transmission of optical signals, the cladding is used to reflect the optical signal, and the coating is to protect the fragile core. Bare fiber means it has not been coated fiber.
 
Loose tube
 
The loose tube is outside layer of protection for fiber. Because of fiber’s very fragile, easily broken, which the production will be one or more optical fibers placed inside the loose tube, and then fill in the ointment. Then, coupled with strengthening the core which used to increase the fiber optic cable  strength and the outer sheath, such as aluminum foil and polyethylene jacket, became a fiber optic cable.
 
Tight buffer tube
 
With tight buffered single mode or multimode optical fiber secondary coating structure is called tight buffered optical fiber. The second set directly on the bare optical fiber is made of a coated optical fiber plastic, such as PVC, PVDF, LSZH, etc. It is the basic components for the manufacture of a variety of indoor cable, which can also be used alone. The tight buffer fiber can be used directly in pigtail for the connection of various types of optical active or passive components, instruments and terminal equipment connections.

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