The internal structure of the optical fiber are making with a lot of materials. It has a combination of glasses, a tube. The quartz rod, having undergone the modified chemical vapor deposition process, is now placed vertically in a drawing tower where it is further heated and drawn downward by means of a computer-controlled melting and drawing process which produced a fine, high quality fiber thread approximately 125 micro meter in diameter and about 6.25 km in length.
The optically pure center, called the core is surrounded by less optically pure quartz called the cladding. The cladding is approximately 117micro meter of boundary material formed during MCVD process. All data concerning the fiber is then measured and recorded. This data is stored with the spool of fiber as a permanent record. The is coated during the drawing process with polyethylene or epoxy for protection, and in some instances color coding is applied, according to the users needs
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