At present, most of the proposed data center optical interconnection network architectures use optical networks for inter-rack communication among switches, while the intra-rack communication among servers is still realized by electrical Ethernet switches. Due to the large power and large number of electrical Ethernet switches, the existing data center optical interconnection networks have the problems of high energy consumption, low bandwidth provision and large packet delay.

In order to further improve the performance of data center optical interconnection network, this paper proposes an in-rack optical interconnection network architecture based on a rearrangeable non-blocking Clos network. In this architecture, servers in the rack are connected to each other through a three-stage Clos network. Non-blocking communication between servers in the rack can be achieved by the proposed multi-wavelength routing algorithm.

In this paper, OMNET+ + software is used for simulation verification. The simulation results show that the throughput of the proposed architecture is 20% higher than that of the traditional in-rack electrical switching under the same conditions. The average end-to-end delay is reduced by 90%, and the energy consumption is reduced by 67%.

It also demonstrates that the proposed architecture can improve the performance of bandwidth usage, packet delay and energy consumption in a data center optical interconnection network.