Title: Method and apparatus for introducing geometrical perturbations in optical fiber waveguides

Abstract: The present invention relates to method and apparatus for fabricating multimode optical fiber waveguides having reduced modal dispersion as a result of deliberate enhancement of mode coupling in the waveguide. The axial alignment and/or the diameter of an optical fiber waveguide is varied by means of one or more modulated heat sources, such as, for example, a microflame jet or CO.sub.2 laser, directed against the fiber waveguide. By controlling the modulation of the heat source, the spatial distribution of the geometrical perturbation pattern can be controlled, thereby producing controlled mode coupling in the fiber waveguide.

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Inventors: Presby, Herman Melvin (Highland Park, NJ, US)

Application Number: 670107
Filing Date: 1976-03-25
Publication_date: 1977-07-26
Assignee: Bell Telephone Laboratories, Incorporated (Murray Hill, NJ)
Primary Class(es): 65/382 65/384, 65/391, 65/392, 65/402, 65/438, 65/488, 65/491, 264/1.27, 425/76
Other Classes:
US Patent Ref:

3063094	Nov, 1962	Warthen	65/12.
3499194	Mar, 1970	Schmick	65/2.
3666348	May, 1972	Marcatili	65/3.
3687514	Aug, 1972	Miller et al.	65/DIG.
3823995	Jul, 1974	Carpenter	65/3.
3826560	Jul, 1974	Schultz	65/3.
3879128	Apr, 1975	Presby	65/2.
3907536	Sep, 1975	Achener	65/3.
3909110	Sep, 1975	Marcuse	350/96.
3912478	Oct, 1975	Presby	65/2.
3957474	May, 1976	Kobayashi	65/3.

Other Refs:
Primary Examiner: Lindsay, Jr., Robert L.
Assistant Examiner:
Attorney: Pfeifle; Erwin W.