A METHOD AND APPARATUS OF LIGHT SIGNAL MODULATION IN LIGHT

摘要

The present invention discloses a method and apparatus of light signal modulation in light communication system, the method comprise the following steps: loading a perturbation signal to radio frequency terminal of light modulator, so that enabling output light of light modulator to increase a low frequency perturbation light signal in part that splitted from output of light modulator be converted electronic signal, which is amplified after filter and demodulated synchronizationally with perturbation signal, then is converted bias voltage and inputted bias electrode of light modulator, so that bias voltage of light modulator is stabilized at a bias point. It's apparatus comprising: light modulator, modulation driver, optical power splitter and control circuit. The control circuit generates a perturbation electronic signal in the modulation driver so as to enter into the light modulator after loading onto radio frequency electronic signal, the output light of light modulation enter into the optical power splitter, splitting a part of it to enter into the control circuit, then generate direct current bias voltage, inputting light modulator, enabling direct current bias of light modulator to stabilize at a point from the disclosure of the present invention, so as to output high speed modulated light signal with max extinction ratio.