Demonstration of 8Gb/s 4-PAM Signal All-optical Wavelength Conversion Transmission under Simulated Atmospheric Laser Communication Network

The 4-pulse position modulation (4-PAM) signal is susceptible to atmospheric turbulence and difficult to transmit over long distance. In this paper, the all-optical wavelength conversion (AOWC) and information transmission of 8Gb/s 4-PAM signal are realized for the first time under the atmospheric turbulence simulation device. When the bit error rate is below 7% of forward error correction threshold, compared with the direct double hop link, the wavelength conversion double hop link can improve the receiver sensitivity and improve the system communication performance. Experiments show that the AOWC technology of 4-PAM signal has the potential of high-speed and long-distance transmission under the weak atmospheric turbulence laser communication network link.