Abstract
Recently, considerable interest has been directed toward the development of 1.3-μm amplifiers for fiber-optic communications. The majority of these efforts have used Pr-doped fibers to achieve high gains and output powers, but these amplifiers require challenging diffraction-limited pump sources and hydroscopic fibers.1,2 As an alternative, we have built two compact multipassed Nd:YAG amplifiers by using a commercially mature 809-nm laser diode. Because we used Nd:YAG, these amplifiers also avoided the noise induced by ground-state and excited-state absorption reported with Pr-doped fibers,3 although the bandwidth was significantly narrower. When pumped with a 2-W 809-nm laser diode (SDL model 2370-C), a 1.06- μm version produced 460 mW and a small-signal gain of 51 dB. A 1.32-μm version produced 170 mW and a small-signal gain of 29 dB.
© 1994 Optical Society of America
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