Abstract: A discrete Raman amplifier system is disclosed comprised of a Raman gain fiber span, a first wavelength selection system coupled to a first end of the Raman gain fiber span, a second wavelength selection system coupled to a second end of the Raman gain fiber span, and a pump system. The Raman gain fiber span receives optical signals. The pump system pumps light onto the Raman gain fiber span. The first wavelength selection system and the second wavelength selection system reflect a selected wavelength on the Raman gain fiber span. The light pumped by the pump system and the selected wavelength amplify the optical signals to generate amplified optical signals.

Abstract: An optical amplifier system is disclosed comprising a Thulium-doped fiber span, a pump system, and a feedback loop. The Thulium-doped fiber span receives input optical signals. The pump system pumps light having a wavelength in the range of 1049 nm to 1060 nm onto the Thulium-doped fiber span. The light amplifies the input optical signals to generate amplified optical signals. The Thulium-doped fiber span transfers the amplified optical signals. The feedback loop receives at least one wavelength of amplified emissions from the Thulium-doped fiber span. The feedback loop generates optical feedback signals based the wavelength or wavelengths of the amplified emissions. The feedback loop adds the optical feedback signals to the input optical signals to provide clamping of a gain in the amplified optical signals.