Optimum Launch Power in Multiband Systems

TL;DR

This paper examines the residual throughput penalty caused by ISRS in multiband systems after power optimization, and reevaluates the 3-dB launch power rule, highlighting its limitations for system performance.

Contribution

The study provides new insights into the residual penalty effects of ISRS and offers a revised perspective on launch power optimization in multiband optical systems.

Findings

Residual throughput penalty due to ISRS is mild after optimization.

Using the 3-dB launch power rule can increase GSN R non-uniformity.

Reevaluates the advisability of the 3-dB rule in multiband systems.

Abstract

We investigate the residual throughput penalty due to ISRS, after power-optimization, in multiband systems. We show it to be mild. We also revisit the launch power optimization 3-dB rule. We find that using it is possible but not advisable due to increased GSNR non-uniformity.