Abstract: A transmitter includes a Local Oscillator (LO) circuit, multiple Radio Frequency (RF) combiners, and an optical transmitter. The LO circuit is configured to generate multiple LO signals having different LO frequencies. The Radio Frequency (RF) combiners are configured to receive multiple baseband signals and to respectively combine the baseband signals with the LO signals to produce combined baseband signals. The optical transmitter includes multiple optical sources, multiple modulators, and an optical multiplexer. The optical sources are configured to generate, when unmodulated, optical beams having a common wavelength. The modulators are configured to modulate the optical sources or the optical beams using the combined baseband signals, thereby generating multiple modulated optical signals having different wavelengths. The optical multiplexer is configured to optically combine the modulated optical signals to form a combined optical signal, and to transmit the combined optical signal over an optical fiber.

Abstract: A system includes a downconverter, an optical transmitter, an optical receiver, and an upconverter. The downconverter includes an LO1 circuit and a mixer. The LO1 circuit generates an LO1 signal synchronized with an LO synchronization signal. The mixer receives RF signals in first frequency bands and downconverts them to second frequency bands by mixing the RF signals with the LO1 signal. The optical transmitter modulates the downconverted RF signals and the LO synchronization signal onto optical beams and transmits the modulated optical beams over a fiber. The optical receiver demodulates the modulated optical beams to reconstruct the downconverted RF signals and the LO synchronization signal. The upconverter includes an LO2 circuit and a mixer. The LO2 circuit generates an LO2 signal responsively to the reconstructed LO synchronization signal. The mixer mixes the reconstructed RF signals with the LO2 signal to reconstruct the RF signals in the first frequency bands.