Propagation Of Coherence And Very High Resolution Measurements In Optical Fibers.

Abstract

Two methods for measuring the dispersion associated with propagation of different modes in guiding structures are presented. While the usual measurements are based on the direct observation of the distortion under gone by propagating pulses, in the first method one obtains information on the delays among the different modes by observing the changes of the coherence properties of a continuous signal. In the second method, one observes the temporal variation of the output intensity once the input signal has been frequency modulated. These methods allow one to appreciate time differences of the order of some picoseconds, so that sufficient delays can be obtained over short fiber lengths. Experiments are illustrated in which delays of this order of magnitude have been actually measured.© (1976) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.