The dependence of the attenuation coefficient on mode excitation in optical waveguides
Abstract
The attenuation coefficient of an optical waveguide is considered, taking into account its definition and the validity of Lambert's law. It is found that the attenuation coefficient d(lambda) can be calculated on the basis of the mean value of the absorption coefficient mj(lambda). The characteristics of near field distribution are studied along with the attenuation coefficient of mode groups. A positionindependent constant K is defined. The near field distribution makes it possible to determine the attenuation coefficient dK(lambda) for mode groups with the same value for K. In connection with the measurement of d(lambda), an attempt is made to obtain a value for dK which is as constant as possible over all modes. This is done by varying the measurement conditions. The total attenuation coefficient of the waveguide is only independent of the length if dK has the same value for all mode groups. According to the considered definition for d(lambda), such an independence from length is necessary.
 Publication:

Kleinheubacher Berichte
 Pub Date:
 1984
 Bibcode:
 1984KlBer..27...91M
 Keywords:

 Attenuation Coefficients;
 Fiber Optics;
 Optical Waveguides;
 Length;
 Modal Response;
 Near Fields;
 Optics