High Efficiency Erbium-Doped Fibers and High Performance Optical Components for Optical Fiber Amplifiers

Hiroo KANAMORI  Akira URANO  Masayuki SHIGEMATSU  Tomonori KASHIWADA  Masahiro HAMADA  Shigeru HIRAI  Hiroshi SUGANUMA  Masayuki NISHIMURA  

IEICE TRANSACTIONS on Communications   Vol.E76-B   No.4   pp.375-381
Publication Date: 1993/04/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Cables and Related Technologies)
optical communication,  communication cable and waveguides,  optical fiber amplifier,  erbium-doped fiber,  optical isolator,  fiber fused coupler,  

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By optimizing the structure of erbium-doped fibers, high efficiency such as a gain coefficient of 6.3dB/mW, or a slope efficiency of 92.6% have been realized with very flat wavelength dependence. Though the optimized structure has high NA, the splice loss with standard fibers can be lowered by the additional arc technique. The carbon coated fiber with a fatigue parameter over 150 guarantees the reliability, even when wounded on a small coil. In-line isolators and WDM couplers have been also developed. An amplifier module has been assembled, resulting in an output power more than +16dBm owing to the high performance of each component.