Multi-Octave, High Dynamic Range Operation of Low-Biased Modulators by Balanced Detection
Patent, Filed 27 Jul 95, patented 1 Jul 97
DEPARTMENT OF THE NAVY WASHINGTON DC
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An optical link is disclosed that is operated by a balanced detection technique so as to extend its linear dynamic range, yet substantially elmainate even order harmonic distortion of the modulated signal. The modulator comprises two parallel arranged Mach-Zehnder interferometers that respectively have a steady state DC voltage bias applied so that the operating points of the Mach-Zehnder interferometers are selected to produce two separate modulated signals one of which is later phase shifted by a phase shift device so as to provide an output that is combined with the other modulated signal in such a manner so as to cause a subtraction, leaving the final output signal substantially free of any unwanted even order harmonic components in order to provide for a multi-octave response characteristic.
- Electrooptical and Optoelectronic Devices
- Optical Detection and Detectors