| http://www.w3.org/ns/prov#value | - The optical modulator 10B externally modulates the laser beam emitted from the LD 10A, according to signals output from the driving circuit 10C and oscillator 11A. For example, utilized as the optical modulator 10B is an optical device having a physical characteristic such as refractive index to be changed by an electro-optic effect or acousto-optic effect.
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