Abstract

Prior to the advent of the Er3+ fiber amplifier, there was considerable work on Raman fiber amplifiers for optical amplification in the 1.5 μm transmission window [1] There are currently no rare-earth-doped silica-fiber-based amplifier options in the 1.3 μm region. Fluoride fibers suffer the disadvantage of the inability to fusion splice to normal silica transmission fiber. Given the recent emergence of high-power, diffraction-limited, diode-based, cladding pumped fiber lasers (up to 5 Watts CW) [2] and other diode-pumped solid state lasers, Raman amplifiers [3] merit a re-investigation for application in the 1.3 μm transmission window. Low loss Bragg grating resonators fabricated directly in germanosilicate fibers by UV exposure allows construction of nested cavities so that several Raman Stokes orders can be resonated simultaneously, efficiently converting to the next higher Stokes order until the cascade is terminated by a suitable output coupler.

© 1995 Optical Society of America

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