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The Signal Attenuation Coefficient of Fiber Optic Cable

CSEF · 2003 Electricity & Electronics

Bruno Maranhao · University High School, Irvine

Overview

Objectives/Goals To calculate the signal attenuation coefficient of a particular fiber optic cable, and demonstrate why it is that red light of a wavelength between 650 and 660 nm is used to transmit signals along industrial fiber optic networks. Methods/Materials Using: one, two, three, and five meter Industrial Fiber Optics Super Eska SH4001 cable I calculated the attenuation coefficient for three different wavelengths emitted from a green, red, and infrared light emitting diode (LED). Results The infrared wavelength signal showed the greatest attenuation, while the green wavelength signal showed the least attenuation. However, the red wavelength signal had the highest optical power at the signal termination. Conclusions/Discussion When transmitting signals across large distance a red light of wavelength between 650 and 660 nm is most frequently used because though red light may not have the lowest attenuation coefficient, it has a significantly greater launch power and hence greater optical power at the signal's termination.

Summary statement

My project deals with calculating the signal attenuation coeffiecient for a particular fiber optic cable.

Help received

I would like to thank my mother for helping me put my project backboard together, and my father for financially supporting my project.

Competition history

  • CSEF 2003 Electricity & Electronics · Entry S0710

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Source: California Science & Engineering Fair public projects

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