Due to their low costs, low power consumption, and high speed, passive optical interconnection data centers have been widely concerned. In a passive optical interconnection data center, the channel number available at the same time cannot exceed the available wavelength number, and the wavelength number limits the total throughput. To reduce the wavelength requirements for optical interconnection data centers and improve the wavelength utilization and scalability of the optical interconnection data centers, we apply NRZ+Manchester signals combined with polarization multiplexing to the optical interconnection data centers in this paper. Four servers share one wavelength, which increases the throughput by four times. Simulation results show that the proposed scheme can realize the optical interconnection of 64 servers in the rack at the rate of 10 Gbit/s, where only 16 wavelengths are needed. At the rate of 25 Gbit/s, only eight wavelengths are required for the optical interconnection of 32 servers. This scheme can save 75% wavelengths, reduce equipment costs, and improve the throughput of optical interconnection data centers.