Patent ID: 7446696

Claim:
A radio signal radiation system comprising: an optical modulator; a light source for inputting an optical carrier wave “A” into said optical modulator; a power source for applying a modulating signal having a frequency fm on said optical modulator so as to superimpose a sideband wave “fm” onto said optical carrier wave “A”, said modulating signal having an amplitude of n times (“n” representing an integer of 2 or more) of the driving voltage Vπ of said optical modulator; a light receiver to receive an outgoing light “B” from said optical modulator and to convert said outgoing light into an electrical signal; and a radiating means for radiating a radio signal “C” based on said electrical signal, wherein said sideband wave is superimposed at a position shifted by a frequency of n×fm with respect to said optical carrier wave “A” to radiate said radio signal of a frequency n×fm.