Abstract
This paper describes development of lumped constant type LiNbO_3 optical modulators that operates via a faint signal at microwave frequencies for TV program transmission of terrestrial digital TV broadcasting. This evolutional high sensitive LN optical modulators with a C/N of about 25dB at 6GHz was fabricated by modifying the modulator's size and electrode structure. By using a low noise head amplifier, system C/N of about 45dB that is target performance can be obtained.
