Optical Amplitude Multiplexing through Parametric Amplification: An Analysis for the Idler Signal

Recently a new technique that used parametric amplification in optical fibers to combine two binary signals into a single quaternary amplitude-shift keying (4-ASK) signal, at frequency of signal to be amplified, was proposed. In this paper, other new technique with use of parametric amplification, also to combine two binary signals into a single quaternary amplitude-shift keying (4-ASK) it is proposed, however, the 4-ASK signal will be generated at idler frequency. We also develop a theoretical model to predict the power level distribution of the 4-ASK signals as a function of the extinction ratios of the input binary signals. Computer simulation results agree with the predictions of this theoretical model within a 1.3 dB margin. Finally, was also performed some simulation to compare the propagation between 4-ASK idler signal with 4- ASK probe signal. This technique could be applied to optically generate optical packets.