Low-frequency signal optical transmission system and low-frequency signal optical transmission method
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United States of America Patent
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Mar 27, 2012
Grant Date -
Mar 31, 2011
app pub date -
Feb 4, 2010
filing date -
Sep 25, 2009
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Abstract
The system includes: a two-light wave generator for generating light beams having wavelengths λ1 and λ2 that are spaced apart by a frequency of a signal M1 from a laser; a photodetector for detecting a signal M2 from the light beams transmitted through an optical fiber; an optical modulator for frequency-shifting the light beams by a frequency of a signal M3; a Faraday reflector for reflecting the light beams; an optical coupler for mixing the light beams that have been returned to a polarization beam splitter, with the generated light beams; a photodetector for converting the light beams into microwave signals; an image rejection mixer for frequency-converting the signals obtained through the conversion by using the signal M1 to output a two side bands; and a phase difference detector for detecting a phase difference between the side bands, and controlling a phase shifter so that the phase difference becomes 0.
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