25 October 2004 Optical gain of single-mode short Er/Yb doped fibers
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Gain and output power as a function of pump power has been calculated for short Er/Yb doped single mode fibers for various fiber parameters. The calculation shows (i) small signal gain increases with increasing Er concentration, (ii) long fiber lengths provide both higher gain and higher output, (iii) calculated gain is larger for higher Er emission cross section, and, (iv) > 25 dB gain is feasible for 5 cm long fiber for Er and Yb concentrations of 3 X 1026 m-3 and 1.2 X 1027 m-3 . Gain of 14 dB has been observed in a 30 mm long fiber at 400 mW. The observed gain is found to be linearly proportional to the length of the fiber with a slope of 0.44 dB/mm at 400 mW of pump power.
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Qiang Wang, Robert G. Ahrens, Niloy K. Dutta, "Optical gain of single-mode short Er/Yb doped fibers", Proc. SPIE 5595, Active and Passive Optical Components for WDM Communications IV, (25 October 2004); doi: 10.1117/12.572443; https://doi.org/10.1117/12.572443

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