The features of the Furnace Chemical Vapor Deposition (FCVD) method of manufacturing preforms for special
optical fibers are considered. It is shown that misalignment of substrate silica tube and furnace hole axes has a negative
effect on the quality of fabricated preforms, leading to angular and radial asymmetry of the refractive index profile.
Ways of getting rid of this and other disadvantages of the FCVD method are described. Some advantages of the FCVD
method over the MCVD method are shown. It was demonstrated that the FCVD method, despite some drawbacks, allows
to manufacture high-quality fiber preforms with good symmetry of the refractive index profile, and thus it is promising
for fabrication of dispersion, dispersion varying and active fibers.