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Abstract
AbstractThe “eye‐safe” waveband infrared laser radiation with wavelength of around 1.5 μm has extensive applications in communication, medical care, remote control, etc. An erbium/ytterbium co‐doped double clad fiber amplifier operating at 1.5‐μm wavelength is studied in this article. Theory models, which include calculation of amplified spontaneous emission powers, is built on rate equations describing the energy level transition and intercross transfer, and power propagation equations. Influence of gain fiber length and input signal power on amplifier's output power is analyzed and the amplifier's optimal parameters are derived via simulations. The laser's power spectrums after amplification are found to be satisfactory. An experiment of erbium/ytterbium doped fiber amplifier is also performed. A set of input–output power curves with varying pump powers are measured, which confirm our theoretical analysis. A highest output power of 1.33 W is achieved in the experiment. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1332–1335, 2012
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