Principles of Fiber Optics

About the principles of fiber optics

The central part of a fiber optic system is a light-transmitting cable containing at least one but more often a bundle of glass or plastic fibers. This is terminated at each end by a transducer. At the input end, the transducer converts the signal from the electrical form in which most signals originate into light. At the output end, the transducer converts the transmitted light back into an electrical form suitable for use by data recording, manipulation and display systems. These two transducers are often known as the transmitter and receiver respectively.


The arrangement described above is somewhat modified when the cable is used directly as a sensor. In that case, the light injected into the cable comes directly from a light source and does not originate as an electrical signal. However, the same mechanisms have to be used to get the light into the cable.


More Fiber Optic Sensors and Transmission Systems

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