Abstract
Currently the most promising candidate for a practical 1.3-μm fiber amplifier is the praseodymium-doped fluoride fiber amplifier (PDFFA). However the low quantum efficiency of the 1.3-μm band stimulated transition of the present PDFFA requires high power pump lasers. The first commercial prototype PDFFA module appeared in the market place last year [1]. This module uses a high power Nd:YLF laser pumped with a semiconductor laser diode (LD). Furthermore, a PDFFA module pumped by 1.02-μm strained InGaAs quantum well LDs consisted of four LD modules [2].
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