摘要:
Methods and apparatuses for forming optical preforms from silica glass soot are disclosed. According to one embodiment, a method for forming an optical preform may include loading silica glass soot in a mold cavity of a mold body. The mold body may be rotated at a rotational speed sufficient to force the silica glass soot towards an inner wall of the mold body. Thereafter the silica glass soot is compressed in an inward radial direction as the mold body is rotated to form a soot compact layer.
摘要:
The invention relates to a method for welding together one end of a primary preform 100 and one end of a silica bar 210, 215 having different properties, the method comprising the steps of projecting and fusing silica grain under a plasma torch 300 on the end of the primary preform 100 and on the end of the silica bar 210, 215; and bringing into contact the end of the primary preform 100 and the end of the silica bar 210, 215 in order to form a welding area 150 between the end of the primary preform 100 and the end of the silica bar 210, 215. The silica bar may be a supporting silica bar 210, 215 of a glass working lathe support 200, 205 for overcladding the primary preform 100. With the invention, it is possible to secure a primary preform 100 on a glass working lathe support 200, 205 at less costs while limiting the risk of breakage of the weld.
摘要:
A holey optical fibre for supporting propagation of light of a wavelength μ, comprises a plurality of cylinders (10) each having a longitudinal axis, the cylinders (10) being separated from each other by regions of a matrix material (20) and having their longitudinal axes substantially parallel to each other. Each cylinder (10) has a diameter, in the plane perpendicular to the longitudinal axis, that is small enough for the composite material of the ensemble of cylinders and matrix material to be substantially optically homogenous in respect of light of wavelength μ.
摘要:
A method for drawing a glass ingot into a rod having a given outer diameter is described. The method is characterized in that when the glass ingot is fed into a heating zone at a final tapered portion thereof, a temperature in the heating zone is decreased so that the final tapered portion is prevented from being drawn in excess owing to the heat from the heating zone.
摘要:
An optical fiber having reduced residual stress discontinuity is disclosed. The optical fiber includes a core which is an optical transmission medium and a clad for surrounding the core. The residual stress discontinuity at an interface between the core and the clad is 20.0 MPa or less, which is represented by an absolute value of a difference between a minimum axial stress at (r/a) = 0.8-1.1 and a maximum axial stress at (r/a) = 1.0-1.2, wherein a is the radius of the core and r is a radius measured from the center of the core.
摘要:
A preform, a head part for a preform and a method for manufacturing a fibre are described. Said head part being adapted to be attached to a preform of a fibre. Said head part has such a shape that a heat load directed to said preform will be distributed to the cross section of said bulk part in a predetermined manner, like evenly distributing the heat load to the cross section of the preform. When manufacturing a fibre from a preform comprising such a head part the heating of the preform is more controllable thus resulting in a fibre with a better quality.
摘要:
A method and apparatus for manufacturing an optical fiber comprises the steps of and means for heating a glass rod, which is a first preform of the optical fiber, elongating the heated glass rod to generate a second preform, and further heating and drawing the second preform to a filament-like form to generate the optical fiber, wherein the elongation speed is controlled at a plurality of locations along the axial direction of the glass rod based on the diameter at the plurality of locations along the axial direction of the glass rod and the heating is controlled based on the average value of the diameter at the plurality of locations of the glass rod.