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Development of an efficient praseodymium-doped fiber amplifier

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7 Author(s)
Y. Nishida ; NTT Opto-Electron. Labs., Ibaraki, Japan ; M. Yamada ; T. Kanamori ; K. Kobayashi
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This paper describes the development of an efficient praseodymium-doped fluoride fiber amplifier (PDFA) using newly developed PbF2-InF3-based fluoride single-mode fiber. First, the spectroscopic properties of Pr3+ in PbF2-InF 3-based and ZrF4-based fluoride glass are compared and then the fabrication of high-NA PbF2-InF3-based fluoride single-mode fiber is presented. The gain coefficients obtained with the developed fiber are 0.36 dB/mW with a forward pumping scheme and 0.4 dB/mW with a bidirectional pumping scheme. We use this newly developed fiber to construct two types of an efficient PDFA module. We realized a 19-in rack size PDFA module with a master oscillator/power amplifier laser diode (MOPA-LD) and a plug-in type PDFA module with a wavelength-stabilized 1.017-μm LD and describe their amplification characteristics

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IEEE Journal of Quantum Electronics  (Volume:34 ,  Issue: 8 )