Hybrid Fiber Amplifier Research Articles

Wide-band and gain-flattened hybrid fiber amplifier consisting of an EDFA and a multiwavelength pumped Raman amplifier

A wide-band and finely gain-flattened hybrid fiber amplifier is realized. The seamless 3.0-, 1.3-, and 1.0-dB bandwidths of 80, 76, and 69 nm with relative gain-flatness of 11.3%, 4.7%, and 3.7%, respectively, are achieved for the first time using the amplifier. The amplifier consists of an erbium-doped fiber amplifier, which has a short fluoride-based erbium-doped fiber, a discrete Raman amplifier, which has two isolated Raman fibers pumped simultaneously at three wavelengths, and a small-peak-loss gain-equalizer. The amplifier also yields optical noise figures under 6.0 dB.

Role of the materials scientist in design and production of PM parts: H.I. Sanderow, (Management and Engineering Technologies, Dayton, Ohio, USA)

Hybrid fiber amplifier chains employing polarization-maintaining (PM)/non-polarization-maintaining (non-PM) Yb-doped fibers (YDF) were proposed and the polarization extinction ratio (PER) degradation in the amplifier chains was studied experimentally. It was found that the PER increased if the PM YDF was pumped, while the PER decreased gradually if the non-PM YDF was pumped. In addition, it was shown that the hybrid high power fiber amplifier was also coherently combinable experimentally, and it was found that the contrast of pattern captured while using the PM/non-PM hybrid amplifier chains just decreased by 17% compared with only using PM amplifier, which confirmed the feasibility and potential application of the hybrid fiber amplifier chains in the coherent beam combination (CBC) of fiber lasers.