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1.3 µm-Band Pr-Doped Fluoride Fiber Amplifier Module Pumped by Laser Diodes

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Abstract

Pr-doped fluoride fiber(PDF) is the most promising fiber-type gain medium for the 1.3 µm fiber amplifiers(1)-(3). However, to date, Pr-doped fluoride fiber amplifier (PDFA) module pumped by laser diodes (LD's) has not been developed yet. The difficulties in constructing PDFA compact modules are as follows: To achieve a high signal gain, it is necessary to develop a pump power of more than 100 mW and a high numerical aperture (NA) fiber structure, because a PDF has the low quantum efficiency of the 1.3 µm-band stimulated transition (1G4-3H5) as yet. Furthermore, it is difficult to achieve a low-loss, stable splice between high NA PDF and silica fiber.

© 1992 Optical Society of America

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