Patent ID: 7272270

Claim:
A optical modulation system comprising: a light source; an optical modulator driven by an external driving source for modulating light emitted from said light source; and an optical waveguide for guiding modulated light modulated by said optical modulator, wherein said optical modulator is a Fabry-Perot resonator type optical modulator formed on a substrate, said optical modulator includes a laminate structure comprised of an electro-optical layer, an upper electrode layer overlying the electro-optical layer and a lower electrode layer underlying the electro-optical layer to sandwich the electro-optical layer therebetween, and an upper reflective layer overlying the upper electrode layer and a lower reflective layer underlying the lower electrode layer to sandwich the upper electrode, electro-optical layer, and lower electrode layer therebetween, and said optical modulator has a reactance, an absolute value of which is higher than an impedance of said external driving source in a frequency range equal to or lower than 200 GHz.