Wavelength division multiplexing (WDM) beam source

A wavelength division multiplexing (WDM) beam source, said beam source comprising:

• a plurality of optical devices in the beam source each generating an optical beam at a different wavelength on a separate input fiber;
• a spectral multiplexer in the beam source that receives all of the optical beams on the separate fibers and spectrally combines the optical beams onto a common fiber;
• an electro-optical phase modulator (EOM) in the beam source responsive to the combined optical beams on the common fiber, said EOM modulating the combined optical beams by changing the phase of the combined optical beams to be proportional to an applied voltage from an RF driver;
• and
• a spectral demultiplexer in the beam source responsive to the modulated and combined optical beams on the common fiber and spectrally separating the optical beams onto separate output fibers, said separated optical beams being transmitted by a transmitter.