METHOD FOR GENERATING PHASE MODULATION SIGNAL, APPARATUS FOR GENERATING PHASE MODULATION SIGNAL AND OPTICAL NETWORK USING THE SAME

摘要

PURPOSE: A method for creating a PSK signal, an apparatus for creating the PSK signal, and an optical network using the same are provided to create the PSK signal and a QPSK(Quadrature Phase Shift Keying) signal through a RSOA. CONSTITUTION: Using a PPG(Pulse Pattern Generator)(41), the electric signal of 2 level is created. A RSOA(Reflective Semiconductor Optical Amplifier) creates a PSK(Phase Shift Keying) signal with the phase shifting characteristic of an output signal generated in direct modulation. The rotation angle of a mark increases in proportion to the size of a modulation current. By the control of the size of the modulation current, the RSOA performs the phase modulation. In case an extinction ratio is 2.0 dB due to the influence of pattern, the performance of a signal is optimized.