Measurement of stresses in optical fiber and preform.

A method of measuring the stresses, residual or applied, in an optical fiber or preform is presented. It is shown that the stress profiles can be obtained from the Abel transform of the derivative of the retardation. The axial stress profile is shown to bear the same shape as the refractive-index profile. Measurement results indicate that the applied tension during the fiber drawing process is frozen into the fiber, consequently affecting the intrinsic strength of the fiber. The method of estimating the fiber drawing tension from the fiber stress profile is also given.

[1]  A. R. Cooper,et al.  Strengthening of Glass Fibers: I, Cladding * , 1969 .

[2]  Pak Lim Chu,et al.  Nondestructive measurement of index profile of an optical-fibre preform , 1977 .

[3]  G. Scherer,et al.  Stress-induced index profile distortion in optical waveguides. , 1980, Applied optics.

[4]  A. W. Sáenz,et al.  Quenching stresses in transparent isotropic media and the photoelastic method , 1950 .

[5]  Thermal stresses in a cylinder: Application to optical waveguide blanks , 1979 .

[6]  Charles R. Kurkjian,et al.  Calculation of Cooling Rate and Induced Stresses in Drawing of Optical Fibers , 1975 .

[7]  K. Brugger,et al.  Effect of thermal stress on refractive index in clad fibers. , 1971, Applied optics.

[8]  Masao Kawachi,et al.  Nondestructive Structure Measurement of Optical-Fiber Preforms with Photoelastic Effect , 1979 .

[9]  P. Sutton.  Stress Measurement in Circular Cylinders , 1958 .

[10]  L. Rongved,et al.  Mechanical tempering of optical fibers , 1980 .

[11]  S. Kawakami,et al.  Change of the refractive index in an optical fiber due to external forces. , 1978, Applied optics.

[12]  N Lagakos,et al.  Stress optic coefficient and stress profile in optical fibers. , 1981, Applied optics.

[13]  George W. Scherer.  Stress-optical effects in optical waveguides , 1980 .

[14]  M. Saunders.  Determination of the stress in optical fibers by means of a polariscope , 1976 .

[15]  A. R. Cooper,et al.  Thermal Stresses in Clad‐Glass Fibers , 1980 .