With the rapid development of the internet industry, the expansion of data centers optical interconnection has become an inevitable trend. Insufficient wavelength resources in data centers will become an important factor restricting the development of data centers. this paper proposes a wavelength reuse passive optical interconnection scheme, two signals are modulated on the same optical carrier, and the optical orthogonal modulation technique is used to achieve error-free signal transmission. At the same time, polarization multiplexing technology is used to reduce the number of wavelengths required for data centers optical interconnection to 14, thereby improving the utilization of wavelength resources.