Authors
Abstract
The aim of this research is to examine experimentally the laser pulse
transmittance in graded index optical fiber. However attention is paid on the evaluation
of intermodal dispersion. Four signals (λ=680nm and power= 0.1mW) of different
frequencies (138.889, 277.778, 645.16, and 1369.863 Hz), of pulse widths (7.2, 3.6,
1.55, and 0.73 ms) respectively are sent through a 400m multimode graded index fiber.
A p-i-n detector is used to receive output signals. Intermodal dispersion has been
noticed and the pulse width broadening for each frequency is recorded. They are (7.22,
3.61, 1.555, and 0.732 ms) that lead to frequencies of (138.504, 277.008, 643.08,
1366.120 Hz) respectively. That change in frequency has to be taken into account
whenever fiber optic dependence communication, guidance, or control systems are
considered.
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