Measurements of wavelength dependence of group delay in a multimode silica fiber

Abstract

The wavelength dependence of the group delay in a multimode silica fiber was determined from the wavelength‐dependent phase shift of the sinusoidally modulated light transmitted by the fiber. When the lower‐order modes were dominant in the modal power distribution, the measured dispersion at a wavelength of 830 nm was 0.90 ns/10 nm/km. When the launching conditions were changed to excite more of the higher‐order modes, the measured dispersion decreased to 0.60 ns/10 nm/km, indicating that the material dispersion was compensated partially by the waveguide dispersion.