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What does PDFA stand for?

PDFA stands for Praseodymium doped fiber amplifiers

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Samples in periodicals archive:

O-band optical fiber amplifier PDFA(Praseodymium Doped Fiber Amplifier.
Existing GaAs based optical sources, silicon photo detectors, and multimode fibers were used in these links and quiet understandably they suffered from intermodal dispersion and fiber losses. With the advent of optical sources and photo detectors capable of operating at 1300 nm, a shift in transmission wavelength from 850nm to 1300nm was possible which inturn resulted in a substantial increase in the repeaterless transmission distance for long haul telephone trunks. Systems operating at 1550nm provided lowest attenuation and these links routinely carry traffic at around 2. 5Gb/s over 90 km repeaterless distance. The introduction of optical amplifiers like Erbium-doped fiber amplifiers (EDFA) and Praseodymium-doped fiber amplifiers.