A communications transmission system which modulates a radiation source at higher rates for either fiber optic telecommunication systems or for digital electrical or optical switches associated with computer routers or servers is presented. The transmission system increases the amount of analog or digital information that can be transmitted over a communications network. The system comprises a first source (10) for providing a carrier signal; a modulator (12) receptive of the carrier signal and an information signal to generate thereby a modulated carrier signal; a second source (18) for providing a transmission signal; and a signal mixer (20) receptive of the modulated carrier signal and the transmission signal to generate a frequency shifted transmission signal. A method of increasing the amount of information transmitted over a communications channel comprises modulating a carrier signal with an information signal, generating thereby a modulated carrier signal; and mixing a transmission signal with the modulated carrier signal, generating thereby a frequency shifted transmission signal.
