Optical Fiber Modulation Techniques for Single Mode Fiber Sensors

  • R. P. Tatam


In order to be able to implement the signal processing techniques required for single mode fiber sensors, a means is required of measuring changes in one or more of the parameters describing the optical beam: amplitude, phase, direction and frequency of the light wave. Temporal modulation of one, or more, of these parameters enables information to be encoded onto or extracted from the optical wave. For example, optical communication systems often use amplitude modulation of the light to encode information combined with modulation of the optical frequency to enable multiplexing and demultiplexing of a number of different signals. In single mode fiber optic sensor systems we are generally using interferometry to transduce very high frequency electric field oscillations (1014– 1015 Hz in the visible) to intensity modulations. Measurands then induce a change in the optical phase, frequency or polarization state of the beam. Optical fiber modulation techniques are therefore required to either encode information or extract information from the fiber guided beam.


Optical Fiber Acoustic Wave Frequency Shifter Surface Acoustic Wave Ring Resonator 
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© Springer Science+Business Media New York 2000

Authors and Affiliations

  • R. P. Tatam

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