Optimum design of Er3+-Yb3+ codoped fibersfor large-signal high-pump-power applications |
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| Authors: | Karasek M |
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| Affiliation: | Inst. of Radio Eng. & Electron., Czechoslovak Acad. of Sci., Prague; |
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| Abstract: | A comprehensive numerical fiber amplifier model has been used to optimize Er3+-Yb3+ codoped active fiber for maximum gain and quantum conversion efficiency (QCE) at large signal operation. The optimum cutoff wavelength of the LP11 mode has been found to increase from 800 mm at low pump powers (≈50 mW) to 1400 mn at pump powers higher than 500 mW. While at low pump powers fibers with higher numerical aperture give higher QCE, at high pump levels better large signal performance is achieved with fibers having lower numerical aperture |
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