what are the optical link budgets in this 8 km dark fiber path? what's the tx launch power? what's the frequency bottom end and top end, in nanometers or THz?

what are the optical link budgets in this 8 km dark fiber path? what's the tx launch power? what's the frequency bottom end and top end, in nanometers or THz? does this all run in the normal ITU DWDM range from approx. 1528nm up to 1568nm, or wider than that? https://www.fiberoptics4sale.com/blogs/itu-standards/100434502-itu-c-band-50-ghz-100-ghz-dwdm-grid https://www.fiberoptics4sale.com/blogs/itu-standards/1004345... what's the expected path loss? I assume this is some normal 9/125 singlemode fiber and two strands. what's the usable RSL threshold on the far end?