Abstract: The present disclosure relates to a method and apparatus for constraining an optical fiber (104) in the draw tower (100, 101). The method (700) includes steps of trapping (714) the optical fiber (104) in a central position along a vertical axis (Y-Y) by one or more acoustic waves generated by an acoustic centering apparatus (112). In particular, the vertical axis (Y-Y) is parallel to a draw tower axis (Y?-Y?) and/or coincides with the draw tower axis (Y?-Y?). The movement of the optical fiber (104) is constrained within 1 milli-meter from the vertical axis (Y-Y) with a coating ovality of a coated optical fiber (105) is less than 4%.

Abstract: The present disclosure provides an apparatus to levitate an optical fiber having a tubular block defined by a central cavity and a plurality of slit walls. In particular, the tubular block has a reservoir that is adapted to store a fluid at a positive pressure. Each slit wall of the plurality of slit walls comprises one or more side slits and the plurality of slit walls defines a bottom slit such that the one or more side slits and the bottom slit provide one or more paths between the reservoir and the central cavity.