Research On Optical Phase Decomposition And Format Conversion Technology Based On Phase Sensitive Amplification

The realization of all-optical signal processing technology greatly improves the processing rate of optical signals as well as the speed of processing and exchange of massive information in the network,which is expected to alleviate the pressure of rapid increase in bandwidth demand brought by diversified services.At the same time,higher requirements are put forward for the transmission capacity and processing speed of the network.The development of all-optical signal processing technology can solve the problem of high-speed signal processing.Format conversion of high-order modulation format and phase quantization of all-phase signal using phase-sensitive amplifier are the key parts of all-optical signal processing technology,and have been the research hotspot in the field of all-optical signal processing.All-optical phase quantization technology is a key component of phase-'sensitive amplification technology,it is also the basis of all-optical signal processing based on phase-sensitive amplification technology,which has important research significance.The all-optical phase quantization is mainly applied to all-optical analog-to-digital conversion,but there is still a problem that the quantization accuracy is not high.Similarly,as an application of phase quantization,format conversion can achieve flexible all-optical cross-connection at the all-optical node in the future,and it has extremely important research value.Phase decomposition based on phase-sensitive amplification is a widely used form of format conversion.Phase decomposition is achieved by second-order ideal quantization in phase quantization,which is obtained by compressing the axis deflection and compressing the signals onto orthogonal coordinate axes.In this paper,phase quantization,format conversion and phase decomposition based on phase sensitive amplification are studied.The main work is as follows:1)The effect of phase quantization by coherent superposition of two waves is evaluated.We proposed an analytical solution of the magnitude ratio between the signal and the conjugate harmonic which obtains the optimal quantization effect,and the correctness of the value is verified by simulation.This provides a theoretical basis for realizing better phase regeneration and format conversion based on phase quantization.2)To solve the format conversion of 8PSK signal,we use phase sensitive compression and phase erasure to accomplish the format conversion of 8PSK signal to QPSK and BPSK.After conversion,both of them are at the original frequency,and the required signal-to-noise ratio to reaches the bit error rate of BER= 10-3 of the conversed signal is lower then that of the original signal about 5dB.3)In order to realize the phase decomposition of the 16QAM signal,a degenerate phase sensitive compression scheme is adopted to add the signal and the conjugate harmonic coherently in the coupler to obtain two PAM4 signals in the co-directional and orthogonal direction simultaneously.This scheme simplifies the realization of phase decomposition,keeps the frequency of the decomposed signal the same as the original signal,and reduces the bit error rate.