Effect of Higher Order Modes on Pulse Waveform in a Multimode Optical Fiber

Yuji AZUMAI  Heihachi SATO  

IEICE TRANSACTIONS (1976-1990)   Vol.E70   No.7   pp.652-660
Publication Date: 1987/07/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Cables and Waveguides

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A Gaussian pulse propagated through a multimode optical fiber is well explained by introducing a weighting function of higher order modes into the theoretical formula, being consistent with experimental results. Extending the equation of the pulse propagation in a single mode fiber into that for the multimode fiber, the calculated waveform with several weighting functions is compared with the experimental pulse of a He-Ne 3.39µm mode-locked laser, which propagated through As-S glass fiber. Cosequently, the most appropriate weighting function is found to be hyperbolic function W(l)l-0.7, which depends only on the radial mode l and is independent of the azimuthal mode m. Physical interpretation about the obtained weighting function is also discussed.