Research and design of 800Gbit/s PAM4 LR8 10km optical module

400G optical modules are now in commercial scale, but with the mature development of 5G networks and the rapid expansion of data centers,increasing user demand for data transfer rates,the development and application of 800G optical modules is also becoming more and more urgent. For the above needs, this paper proposes a higher speed 800Gbit/s optical transceiver module design based on Fourth-order Pulse Amplitude Modulation (PAM4) technology with LR8. This article first introduces several 800G optical module solutions,by a simple comparison of several solutions.the 800G PAM4 LR8 10km optical module solution was selected. Next.the research proposal and overall design of the 800G PAM4 LR8 10km optical module are presented.and gives the module overall design scheme diagram. Finally, the 800G PAM4 LR8 10km optical module needs to meet the indicators,such as the module's average optical power.eye diagram parameters, sensitivity, BER, etc. were tested and analyzed.According to the test results, this scheme is technically feasible, and the target of 800Gbit/s can be achieved for all index parameters.