Electric field absorption light modulation driving apparatus and method having improved feature to eliminate noise from optical output

An electric field absorption light modulation driving apparatus comprising:

• an electric field absorption light modulation unit comprising a light emission device for emitting light and a modulation device for varying a light transmittance thereof of light applied by said light emission device so as to provide said light as a result of modifying thereof;
• and
• driving signal generating means, responsive to an input information signal, for generating a driving signal to be applied to said modulation device, said modulation device varying said light transmittance thereof in response to said driving signal level, said driving signal generating means providing said driving signal so that a portion of a driving voltage of said driving signal, in which an undesirable level fluctuation occurs, corresponds to a constant working range of said modulation device;
• said constant working range characterized by a constant value of light transmittance of said modulation device.