Risk-constrained guard bands for flexible-grid optical links

Authors

  • Keshav Kumar Pranveer Singh Institute of Technology, Kanpur
  • Mohit Kumar Srivastava Pranveer Singh Institute of Technology, Kanpur
  • Man Mohan Shukla Pranveer Singh Institute of Technology, Kanpur

DOI:

https://doi.org/10.4302/plp.v18i3.1407

Abstract

Guard bands in flexible-grid links are usually fixed or selected from hop count or OSNR, although spectral overlap is ultimately driven by uncertain transmitter and filtering frequency errors. We formulate a risk-constrained rule that converts monitored laser and wavelength-selective-switch error variances into the smallest 6.25-GHz-grid margin satisfying a prescribed overlap probability. For 32-GBd, 0.1-roll-off channels over 1–20 switching stages, the closed-form rule matches 107-trial Monte Carlo simulation within 3.1%. At a 10−3 risk target it reduces the mean occupied spectral span by 13.1% and 11.1% for 0.5- and 1-GHz laser-error standard deviations, relative to a fixed 12.5-GHz guard.

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References

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Published

2026-10-18

How to Cite

[1]
K. Kumar, M. K. Srivastava, and M. M. Shukla, “ Risk-constrained guard bands for flexible-grid optical links”, Photonics Lett. Pol., vol. 18, no. 3, pp. 44–46, Oct. 2026.

Issue

Vol. 18 No. 3 (2026): Photonics Letters of Poland Vol.18 No.3

Section

Articles

License

Copyright (c) 2026 Keshav Kumar , Mohit Kumar Srivastava, Man Mohan Shukla

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