Wavelength Conversion System using XPM to RZ pattern data

摘要

PURPOSE: A wavelength conversion system using XPM(Cross-Phase Modulation) for RZ(Return-to-Zero) pattern data is provided to simplify the structure of a system and remarkably reduce the manufacturing cost by executing wavelength conversion, based on XPM, in a single SOA(Semiconductor Optical Amplifier). CONSTITUTION: A wavelength conversion system using XPM for RZ pattern data is composed of a circulator(1), the first optical fiber coupler(2), the second optical fiber coupler(3), an SOA(4), a polarization controller(5), the first filter(6), the second filter(7), an isolator(8), and an optical fiber loop mirror(9). If a CW(Continuous Wave) signal is inputted to the circulator(1), the circulator(1) outputs the CW signal to the first optical fiber coupler(2) without reflection or attenuation. The first optical fiber coupler(2) splits the inputted CW signal into a clockwise CW signal and a counterclockwise CW signal. The clockwise CW signal is inputted to the polarization controller(5). The polarization controller(5) converts the polarization and phase of the inputted CW signal and outputs it to the second optical fiber coupler(3). The second optical fiber coupler(3) couples the clockwise CW signal with an inputted data signal through the isolator(8). If the coupled signal is inputted to the SOA(4), the phase of the clockwise CW signal is changed as a refractivity change is caused in the SOA(4). The first filter(6) removes ASE(Amplified Spontaneous Emission) noises and the data signal from the coupled signal and passes the CW signal only.