In this paper, we investigate several architectures of Spatial Division Multiplexing (SDM) optical cross-connects using multi-core optical fibers, and compare them in terms of transmission performance, cost, size, power consumption, and introduce the optimal. In this paper, we investigate several architectures of Spatial Division Multiplexing (SDM) optical cross-connects using multi-core optical fibers, and compare them in terms of transmission performance, cost, size, power consumption, and introduce the optimal. SUMMARY This paper proposes new switch architectures for hierar-chical optical path cross-connect (HOXC) systems. The architectures al-low incremental expansion of system scale in terms of the number of in-put/output fiber ports, wavebands, and optical paths per waveband. We then propose a simple and yet efficient switch-level analytical model for. OXC (optical cross-connect) is an evolved version of ROADM (Reconfigurable Optical Add-Drop Multiplexer). IEICE. In this paper, a semiquantitative analysis of crosstalk in 11 different architectures is presented. Index Terms—Integrated optics, optical. To address this issue, this letter proposes a two-phase approach to construct modular large-scale OXCs, using a set of small-size OXC modules. We first decompose each optical space switch (OS) in a classical OXC to a Clos network and then merge the corresponding links and decomposed optical.