Editing Optical amplifier (section)

===Doped fiber amplifiers for other wavelength ranges===
[[Thulium]] doped fiber amplifiers have been used in the [[S-band]] (1450–1490&nbsp;nm) and [[Praseodymium]] doped amplifiers in the 1300&nbsp;nm region. However, those regions have not seen any significant commercial use so far and so those amplifiers have not been the subject of as much development as the EDFA. However, [[Ytterbium]] doped fiber lasers and amplifiers, operating near 1 micrometre wavelength, have many applications in industrial processing of materials, as these devices can be made with extremely high output power (tens of kilowatts).