Erbium doped fiber amplifier (EDFA)

E5.2.7.6 Erbium doped fiber amplifier (EDFA)


  • Optical pumping.
  • Fiber coupled pump laser.
  • 980 nm and 1.550 nm.
  • Optical gain.
  • Fiber laser.
  • Computer control.
Principle of operation

An Erbium doped fibre is optically pumped by a laser diode emitting at a wavelength of 980 nm. Due to the pump process a population inversion is created between two states with an energy difference corresponding to a wavelength around 1.5 μm. Signals having this wavelength will be amplified when passing the fibre. Such a signal is generated by a laser diode emitting a radiation of 1.5 μm. For combining both emissions a WDM is used.

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