USA As Represented by Secretary of the Navy

David Chao

James R Adleman

Sanja Zlatanovic

An optical single sideband generation system comprising a RF signal generator generates a sawtooth drive voltage with a first frequency. A laser source provides the initial optical carrier with a second frequency that is modulated by a first phase modulator. The modulation shifts the optical carrier by the amount of the first frequency, and with added phase errors due to the imperfections of the sawtooth drive. A directional coupler allows the optical carrier to be divided into the error measurement path and the error correction path. The modulated signal goes to a phase detector that measures the phase error and converts the phase error signal to a baseband electrical signal. The optical signal at the output of the second phase modulator is the desired single sideband shifted from the original carrier with the phase errors of the signal generator suppressed by the error correction feedforward path.

Low distortion and phase noise optical single sideband generation system and related methods

A radio frequency (RF) transceiver comprising: a transmitter configured to produce a plurality of optical carriers; a multi-wavelength electro-optic modulator configured to receive the plurality of optical carriers from the transmitter, wherein the electro-optic modulator is configured to modulate each optical carrier using a same input RF signal, but with a different efficiency for each optical carrier so as to generate an arbitrary number of RF links with various efficiencies using a single modulation electrode; and a receiver designed to produce a synthesized transfer function based on a truncated Fourier Series and configured to use the synthesized transfer function to adjust intermodulation distortion response to optimize dynamic range for the transceiver's operating resolution bandwidth and noise characteristics.

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San Diego, CA, United States of America

David Chao