Method for sintering of optical fibre preform

A method for sintering of an optical fibre preform, the method comprising:

• manufacturing of the optical fibre preform, wherein the optical fibre preform is a porous germania doped silica soot preform;
• drying and sintering of the optical fibre preform, wherein drying and sintering of the optical fibre preform results into a sintered optical fibre preform;
• preparing a glass rod from the sintered optical fibre preform, wherein the glass rod has length in a range of 800 to 1100 millimeter;
• inserting the glass rod into a centerline hole of a silica soot preform, wherein the centerline hole is created by removing mandrel from the silica soot preform;
• drying and sintering of the silica soot preform, wherein drying and sintering of the silica soot preform results into a sintered silica soot preform;
• and
• drawing multiple rods such that each rod of the multiple rods has a length less than 1100 mm and a diameter less than 25 mm from the sintered silica soot preform, wherein the optical fibre preform has refractive index in a range of 2 to 5.