Title :
Physical interpretation of Petermann´s strange spot size for single-mode fibres
Author_Institution :
Australian National University, Research School of Physical Sciences, Canberra, Australia
Abstract :
Petermann´s mathematical definition of spot size using the modal near field and its derivative is proved to be ¿2 times the inverse of the RMS width of the observable modal far field. The theory of fibre optics is given in terms of the transformed field, which determines the far field. Dispersion, splice loss and excitation efficiency are discussed.
Keywords :
losses; optical dispersion; optical fibres; optical waveguide theory; RMS width; dispersion; excitation efficiency; observable modal far field; optical fibres; optical loss; optical waveguide theory; single-mode fibres; splice loss; spot size; transformed field;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19840097
