Single-mode fibers can have bandwidths of the order of 100-1000 GHz km nm, which correspond to several psec/km broadening of semiconductor laser pulses. This is too small to measure in kilometer lengths of fiber because direct detection receivers cannot resolve pulse widths narrower than 50 psec. Practical measurement techniques make use of group velocity dispersion effects which cause light pulses, at simultaneously launched wavelengths. to arrive at different times to the fiber output end. The purpose of this paper is to compare the accuracy, limitations, and ease of implementation of the major dispersion measurement techniques for single-mode fibers.
© 1985 Optical Society of AmericaPDF Article