OPTICAL FIBER WAVEGUIDE WITH
EFFECTIVE REFRACTIVE INDEX PROFILE
 Inventor: Charles K. Kao, Roanoke, Va.
 Assignee: International Telephone and
Telegraph Corporation, New York,
 Appl. No.: 968,326
 Filed: Dec. 11,1978
Related U.S. Application Data
 Continuation of Ser. No. 904,092, May 8, 1978, abandoned, which is a continuation-in-part of Ser. No. 632,046, Nov. 14, 1975, abandoned.
 Int.C1.3 G02B5/14
 U.S. Q 350/96.33
 Field of Search 350/96.31, 96.33
 References Cited
U.S. PATENT DOCUMENTS
4,000,416 12/1976 Goell 350/96.33
4,070,091 1/1978 Taylor et al 350/96.33
4,149,772 4/1979 Iyengar et al 350/96.33
Primary Examiner—Stewart J. Levy
Attorney, Agent, or Firm—John T. O'Halloran; Peter C.
Van Der Sluys
An effective graded index profile optical fiber waveguide comprises alternating regions of high and low indexes of refraction of controlled thickness. The effective refractive index of the fiber has a graded profile of decreasing refractive index when the regions of high index have either a constant or decreasing thickness and the low index regions increase outwardly from the center. The effective refractive index has a particular graded profile of refractive index when the thicknesses of the regions of low refractive index and the high refractive index are appropriately chosen.
9 Claims, 5 Drawing Figures