Tench, Robert E. “BOL and EOL OSNR Margins in 10,000 Km Pb S DWDM Unregenerated All-Optical Lightwave Transmission Systems in the 2000 Nm Band”. Journal of Optics and Photonics Research (September 18, 2025). Accessed September 18, 2025. https://ojs.bonviewpress.com/index.php/JOPR/article/view/6726.