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Raman fiber distributed feedback lasers

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Abstract

We demonstrate fiber distributed feedback (DFB) lasers using Raman gain in two germanosilicate fibers. Our DFB cavities were 124mm uniform fiber Bragg gratings with a π phase shift offset from the grating center. Our pump was at 1480nm and the DFB lasers operated on a single longitudinal mode near 1584nm. In a commercial Raman gain fiber, the maximum output power, linewidth, and threshold were 150mW, 7.5MHz, and 39W, respectively. In a commercial highly nonlinear fiber, these figures improved to 350mW, 4MHz, and 4.3W, respectively. In both lasers, more than 75% of pump power was transmitted, allowing for the possibility of substantial amplification in subsequent Raman gain fiber.

© 2011 Optical Society of America

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