Patent ID: 8644711

Claim:
A driving apparatus of a Reflective Semiconductor Optical Amplifier (RSOA), the apparatus comprising: a coupler splitting an input optical signal to a first optical signal and a second optical signal; a RSOA having a single active region which reflects the second optical signal from a reflective facet and to which a combination of a signal having polarity opposite to the second optical signal and a signal for modulating the second optical signal reflected from the reflective facet to generate an output optical signal is injected; a photo diode converting the first signal into a current signal; a transimpedance amplifier amplifying and converting the current signal transmitted from the photo diode into a voltage signal; a limiting amplifier re-amplifying the voltage signal transmitted from the transimpedance amplifier; a first RF delay circuit adjusting a phase of the signal output from the limiting amplifier and a phase of the input optical signal to the RSOA in such a manner that the intensity of input optical signal input to the RSOA is optimally flattened; an AND gate passing an output signal of the first RF delay circuit therethrough when a upstream signal has a level ‘1’, and preventing the output signal of the first RF delay circuit from passing therethrough when the upstream signal has a level ‘0’; a second RF delay circuit optimally adjusting a phase of a upstream signal input to the AND gate and a phase of a upstream signal transmitted through the second RF delay; an optical delay line optically compensating for electrical delay through the first RF delay circuit; a first LD driver converting an output signal of the AND gate into a current signal; and a second LD driver converting an output signal of the second RF delay circuit to a current signal.