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Free-Space Optical (FSO) based data center(DC) wireless links are often out of alignment in conventional FSO-based DC architectures due to DC rack vibrations. In order to overcome this problem, this paper proposes a new method, the method adopts adaptive laser beam divergence angle, which change the receiver beam coverage to reduce the requirements of high precision alignment through the adaptive adjustment of the laser beam divergence angle, and compensates the wireless optical link misalignment. This method does not require complex acquisition, tracing and pointing(ATP) mechanism, and has the advantage of low equipment and management cost and easy implementation.Finally, the effect of divergence angle on the performance of wireless optical communication link is analyzed by numerical simulation, and the relationship between the optimal beam divergence angle and the pointing error angle caused by rack vibrations is obtained.

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