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Atoms in an excited state will spontaneously emit photons when they fall back to their lower, or ground state. If the active medium is pumped hard, then population inversion will occur, and a high degree of spontaneous emission will occur, which is in effect amplified over that seen at lower pumping levels. In this scheme the wavelength of the output is allowed to run free, and amplified spontaneous emission (ASE) sources often emit across the entire emission waveband of the active medium. A length of erbium doped fiber can be used as an active medium to produce a wideband incoherent ASE light source in the 1530-1565nm wavelength region.

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Related Terms: Amplified Spontaneous Emission, Amplifier, Doping Density, Effective Area, Emission Cross Section, Emission Measurement, Emission Spectra, Erbium Doped Fiber (EDF), Erbium Doped Fiber Amplifier (EDFA), Erbium, Excited State, Gain Coefficient, Population Inversion, Quantum Conversion Efficiency, Rare-Earth Metal, Spontaneous Emission, Stimulated Emission, Ytterbium