Abstract:
The invention relates to an optical transmitting apparatus, which performs an optical modulation on the signal to be transmitted using phases of two optical carriers having respective wavelengths, and transmits the modulated signal to an optical receiving device. The optical receiving device demodulates the phase-modulated optical signal through an amplitude modulation to detect the signal transmitted by the optical transmitting apparatus.
Abstract:
A performance monitor of the optical signal and a method thereof restoring the optical signal according to the performance of the optical signal are provided to improve the reliability of optical network and monitor the performance of the degraded optical signal at each node. A signal extraction part(100) extracts the signal of the specific wave among the inputted optical signal. A photo-electro transform part(110) converts the optical signal of the specific wave extracted from the signal extraction part into the electric signal. An overhead interpreter(120) determines the performance degradation of signal. According to the interpretation result of the extracted overhead, the controller(130) monitors the performance of the optical signal.