Optical crossconnects (OXCs) are critical core for provisioning and restoration in mesh wavelength-division-multiplexing (WDM) networks. An increasingly urgent need for large-port-count OXCs severely challenges the current existing OXC technologies. To reduce the crosspoint complexity, we propose an architecture based on 2×2 switching fabrics by integrating the general symmetric (GS) architecture with Clos and Benes switching architectures together. Rearrangeably and strictly nonblocking structures are examined as well as the control algorithm of the rearrangeably nonblocking structure is studied. Then, we present two basic switching fabrics of the simples 2×2 bidirectional OXC utilizing 2D optical MEMS, one of which is used as the basic building block in our proposed architecture is studied. The resulted switch requires (N/2)×[log2(N/2)]×(log2N-1/2) micromirrors, while the switch based on GS architecture needs 2(N/2)2 micromirrors. It is very clear that our proposed architecture reduces the number of micromirrors greatly, especially when N is large. Moreover, theoretical analyses have shown that the resulted switch has the same insertion loss, lower power consumption, and better performance of port-to-port repeatability, comparing to the conventional crossbar switch.