Experimental Research On Signal Regeneration In Advanced Modulation Format

The explosive growth of the information volume in the real world has led to the increasing pressure on the optical fiber communication system.The advanced modulation format optical signal has become the main modulation mode of the optical fiber communication system in the future because of its better anti-noise performance and higher spectral efficiency.At the same time the use of all-optical approach to the optical signal processing,photoelectric and electro-optical conversion can be avoided to meet the high-speed signal processing needs.At present,phase sensitive amplifiers based on the third-order nonlinear effects and four-wave mixing in optical fiber have become the hot topics in recent years for applications such as low-noise amplification,phase regeneration,phase quantization and format conversion.At present,relevant researches show that the phase sensitive amplifier plays a significant role in advanced modulation format phase regeneration.In this paper,we hope to conduct experimental research on phase regeneration of advanced modulation format optical signals and explore the practical application of phase-sensitive amplification to phase regeneration.The main work and research contents are as follows:The advanced modulation format optical signal modulation and demodulation experiment system and BPSK signal phase regeneration experiment system are set up and the experiment of phase regeneration of BPSK signal and the format conversion experiment of QPSK signal to BPSK signal can be successfully completed by using the experimental system.1.The modulation and demodulation system can realize the modulation and demodulation of BPSK and QPSK signals.In the meantime,the modulation principles of the signals are analyzed in detail,and the experience of modulating BPSK signals and QPSK signals is summarized.2.the experimental principle of phase-sensitive amplifier applied to BPSK signal regeneration is analyzed in detail,and the influence of pump power and phase-sensitive amplification gain axis on signal regeneration is given through the simulation results.The correctness of theoretical derivation and simulation results are verified by comparing the experimental results of BPSK phase regeneration with the simulation results.3.the BPSK signal is loaded with different noise and regenerated,the EVM of the noise is improved from 60.3%to 25.4%before and after regeneration,and the EVM before and after regeneration is increased from 29.7%to 27.6%when the noise is regenerated.It can be seen that the BPSK phase regeneration experimental system has a significant regeneration effect on large noise signals and the effect of phase regeneration of small noise signals is not obvious.4.the QPSK signal format is successfully converted to BPSK signal by using the BPSK phase regeneration experiment system.5.the article also introduces the test work of TWDM-PON optical module,including the design of optical module test board and the test results.During the test,the familiarization of equipment and the standardization of operation flow laid a good foundation for the subsequent BPSK signal regeneration experiment setup process.