The space qualified EDFA consists of its controlling electronics and fiber optics.
The controlling electronics includes the central micro-controller, optical power detection and reporting of EDFA input and output, and the pump laser current driving electronics. All the electronic components are space qualified, with radiation level of 100 krad nominal.
The fiber optics of the space qualified EDFA uses radiation-harden version erbium-doped or erbium/ytterbium co-doped specialty fibers as gain medium. Besides, all the other passive fiber optic components are either High-Rel category items or the best-in-class high power level fiber optics.