US Patent 7672598 Carrier signal suppression and extraction system

A carrier signal extraction system for suppressing and extracting a carrier signal component and transmitting a double sideband component includes a polarized light source for transmitting a polarized light signal output; a polarization modulator with a first input coupled to the polarized light signal output and a second input for adding a modulation signal to the polarized light signal, thereby generating a polarization modulated light output; and a polarizing element having an input coupled to the polarization modulated light output for suppressing and extracting the carrier signal component and preferentially transmitting a double sideband component of the polarization modulated light output.