In the vapor axial deposition (VAD) process, simultaneous deposition of the core and cladding regions of a soot form is necessary for fabrication of high-quality single-mode fibers.1 To achieve the desired deposited clad-to-core ratio of six without fabricating an overwhelmingly large diameter soot form, the deposited core must be <20 mm wide. In multimode VAD, a torch, which is constructed with concentric quartz tubes, usually deposits a soot form ~45–50 mm in diameter. Reduction in dimension of this torch does not allow the deposition of a soot form small enough for use in the single-mode process.1 Japanese workers in single-mode VAD have resorted to use of an eccentric rectangular torch to attain small diameter soot forms.1 Alternatively, we now report the ability of a concentric circular torch configuration to fabricate soot forms suitable for single-mode cores when a circular torch is used with the combination of an air shield and tapered shroud.

© 1985 Optical Society of America

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