Flehr, Hohbach, Test, Albritton & Herbert
Optical Transmission circuit
 An optical transmission circuit comprises a self-excited oscillator means using a negative-resistance semiconductor light-emitting element with a first load resistor, a modulator means for modulating the frequency of said self-excited oscillator means by an input of an analog quantity, and a means for intermittently connecting a second load resistor in place of said first load resistor by an input of a digital quantity, said second load resistor intersecting the light-emitting region of said negative-resistance semiconductor light-emitting element. 
Sharp Kabushiki Kaisha
H
H04B
inventional
Masaru
Nawaki