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<p>In this paper, we compute the optimal slot width which provides a good trade-off between the blocking probability and network cost, aiming to achieve a spectrally and cost-efficient solution for Elastic Optical Networks (EONs). Here we have determined the blocking performance by varying the slot width from 50 GHz down to 1.5625 GHz, followed by network cost estimation considering various network elements, namely transponders and node equipment. The analysis reveals that reducing the slot width from 50 GHz to 6.25 GHz leads to a substantial reduction in blocking probability, approximately 70%, with an estimated normalized cost increment of approximately 0.6. Further reductions to 3.125 GHz and 1.5625 GHz offer only minor additional improvements in blocking probability, while incurring normalized cost increments that are disproportionate to the minor additional performance gains, rising to approximately 0.75 and 1.0 (relative to the 50 GHz baseline). These results indicate that narrowing the slot width beyond 6.25 GHz leads to diminishing returns in performance at a substantially higher cost. Based on this trade-off analysis, 6.25 GHz is identified as the optimal slot width, providing the best balance between blocking performance improvement and network cost efficiency.</p>

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Optimal spectrum granularity for spectrally-efficient elastic optical networks

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月22日

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  • Ujjwal Ujjwal,
  • Shrinivas Petale,
  • Jaisingh Thangaraj

摘要

In this paper, we compute the optimal slot width which provides a good trade-off between the blocking probability and network cost, aiming to achieve a spectrally and cost-efficient solution for Elastic Optical Networks (EONs). Here we have determined the blocking performance by varying the slot width from 50 GHz down to 1.5625 GHz, followed by network cost estimation considering various network elements, namely transponders and node equipment. The analysis reveals that reducing the slot width from 50 GHz to 6.25 GHz leads to a substantial reduction in blocking probability, approximately 70%, with an estimated normalized cost increment of approximately 0.6. Further reductions to 3.125 GHz and 1.5625 GHz offer only minor additional improvements in blocking probability, while incurring normalized cost increments that are disproportionate to the minor additional performance gains, rising to approximately 0.75 and 1.0 (relative to the 50 GHz baseline). These results indicate that narrowing the slot width beyond 6.25 GHz leads to diminishing returns in performance at a substantially higher cost. Based on this trade-off analysis, 6.25 GHz is identified as the optimal slot width, providing the best balance between blocking performance improvement and network cost efficiency.