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Where two ions work together to absorb energy, which increases the energy level that can be reached. This will be a higher energy than would be reached in a single ion, and so shorter wavelength photons can be created than were put into the fiber.

Related Products: Dual Clad Erbium/Ytterbium Doped Fiber, Erbium Doped Fiber IsoGain™, Erbium Doped Fiber MetroGain™, SM Erbium/Ytterbium Doped Fiber, SM Ytterbium Doped Fiber

Related Terms: Absorption, Amplified Spontaneous Emission, Amplifier, Emission Spectra, Erbium Doped Fiber (EDF), Erbium, Excited State, Excited State Absorption (ESA), Fiber, Multi-Photon and Multi-Phonon Interactions, Power Conversion Efficiency, Pumping, Quantum Conversion Efficiency, Rare-Earth Metal, Wavelength