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Cost-Efficient Partial-Port Wavelength-Convertible Multi-Band Optical Cross-Connects: Architecture and Upgrade Strategies
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DOI：10.1109/jlt.2026.3699478.png)
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Abstract
En 中文
Multi-band transmission is a promising approach for network capacity expansion by exploiting the underutilized low-loss spectrum of single-mode fibers. As a key component of multi-band optical networks, the architecture of multi-band optical cross-connects (MB-OXCs) critically affects network performance; however, existing designs are constrained by scalability, blocking performance, and deployment cost. To address these challenges, we propose a partial-port wavelength-convertible (PPWC) MB-OXC architecture that integrates ports with and without wavelength conversion capability. While wavelength conversion enhances wavelength utilization, it also degrades the generalized signal-to-noise ratio (GSNR) of lightpaths, making it essential to balance this tradeoff by identifying an optimal ratio between convertible and non-convertible ports. Simulation results demonstrate that, with an optimally configured conversion ratio, the PPWC architecture achieves low blocking probability while effectively controlling network cost. Furthermore, we investigate the upgrade of conventional nodes to PPWC nodes and propose four node upgrade strategies to balance performance improvement and deployment cost. Among them, the Maximum-Benefit-First Strategy (MBFS) achieves the largest reduction in blocking probability with minimal cost increase and outperforms an all-PPWC deployment in terms of overall cost efficiency. Together, the proposed PPWC architecture and the MBFS upgrade strategy provide an effective and cost-efficient solution for multi-band optical networks.
Keywords:
MB-OXC
multi-band transmission
node upgrade
PPWC
wavelength conversion
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