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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper WJ6

Gain flatness of a 30 dBm tandem Er3+-Er3+/Yb3+ double-clad fiber amplifier for WDM transmission

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Abstract

Yb3+ sensitized Er3+ doped fiber enables the design of high output power amplifiers for use in many digital and analog optical transmission applications. Indeed, ytterbium co-doping allows higher pump absorption together with a broader selection of pump wavelengths (from 800 nm to 1100 nm) and a higher level of pump powers. Early demonstrations of high output power Er3+-Yb3+ fiber amplifiers (EYDFAs) were achieved by pumping single-mode silica fibers with multi-Watt diode pumped fiber or solid-state laser sources around 1060 nm.1 Unfortunately, direct core pumping through conventional lossy signal pump combiners (e.g., MUXes) reduces the pumping efficiency and increases the potential signal degradation caused by the generation of nonlinearities in the active fiber. More recently, pumping of double clad fiber amplifiers with low-cost broad stripe 980 nm laser diodes has enabled the demonstration of high output EYDFAs with higher efficiencies and less complex topologies. Essentially, two successful clad pump techniques have been described in the literature: the bundle2 and the V-groove side pumping3 techniques. Most of the data reported on EYDFAs concerns single wavelength analog CATV applications where a combination of low noise, minimized gain tilt, and high output power are required. In contrast, limited information, and only for direct core pumping EYDFAs, has been provided on the spectral gain flatness and associated noise figure for its use in wavelength division multiplexed (WDM) systems.1

© 2002 Optical Society of America

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