Single mode fiber optic single sideband modulator and method of frequency shifting using same
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United States of America Patent
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-
Dec 20, 1988
Issued Date -
N/A
app pub date -
May 15, 1987
filing date -
Nov 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fiber optic frequency shifter comprising two waveguides having different indices of refraction. In some embodiments the waveguides are two modes of propagation in one fiber. Plural distributed coupling ridges, or electrodes mounted adjacent piezoelectric materials, are independently driven to apply sinusoidally varying forces to the fiber. In some embodiments, the phase relationship of the driving signals for the electrodes or ridges is such that a travelling acoustic wave is launched in the fiber. In other embodiments, regions of stress in the fiber are created by an acoustic wave coupled into the fiber from a transducer coupled to an acoustic medium surrounding the fiber. The input carrier light is shifted in frequency by the frequency of the acoustic wave.
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