This study theoretically analyzed the reasons why, in the copolarized dual-pump scheme, wavelength conversion does not change the probability distribution of the probability shaping (PS) signal and the order of orthogonal frequency division multiplexing (OFDM) signal subcarriers can remain unchanged. Then, after all-optical wavelength conversion, the transmission of the PS-64QAM-OFDM signal through a highly nonlinear optical fiber in a homodyne coherent detection system was experimentally verified. Finally, the experimental results indicate that when the baud rate is 20 Gbaud and the bit error rate is 1×10^-2, the optical signal-to-noise ratio (OSNR) loss of an ordinary 64QAM signal is 1 dB, and the OSNR loss for PS-64QAM signal is improved by 0.5 dB.