We show that frequency-wavelength tuning characteristics of acousto-optic coupling can be used for measuring the difference of effective index, group index, and chromatic dispersion between core and cladding modes in single-mode fibers. Chromatic dispersion measurements of a 30-cm-long conventional single-mode fiber, a nonzero dispersion-shifted fiber, and a dispersion-compensating fiber with this new method are presented for the wavelength range 1500–1600 nm. Qualitative agreement with independently measured data is obtained.
© 2003 Optical Society of America
Qun Li, Pedram Zare Dashti, I.V. Tomov, and H. P. Lee, "Measurement of modal dispersion in optical fiber by means of acousto-optic coupling," Opt. Lett. 28, 75-77 (2003)