1 October 2007 Red (632.8-nm) attenuation by a copropagating 1175-nm signal in Tm3+-doped optical fibers
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Optical Engineering, 46(10), 105001 (2007). doi:10.1117/1.2790043
Abstract
The attenuation properties of Tm3+ -doped fluorozirconate optical fibers at 632.8 nm induced by a signal at 1175 nm are investigated for the first time. We believe this approach has potential applications in Q-switching of fiber lasers. A red-guided signal is gradually attenuated up to 14.7 dB by increasingly applying a copropagating 1175-nm signal. This value is obtained in 12.5-cm samples. Fibers with different concentrations (1000, 2000, and 20,000 ppm wt) are characterized. For example, the most efficient, the 20,000-ppm wt fiber, requires ~120 mW to exhibit complete attenuation, although 30 mW would be sufficient for a smaller core. In general, low concentration is related to fast response and high concentration to high efficiency. In the fiber with the best performance, the 2000 ppm wt, a red signal is 13.5% modulated up to 130 Hz with a theoretical limit of 266 Hz.
Efrain Mejia-Beltran, D. Talavera Velázquez, "Red (632.8-nm) attenuation by a copropagating 1175-nm signal in Tm3+-doped optical fibers," Optical Engineering 46(10), 105001 (1 October 2007). http://dx.doi.org/10.1117/1.2790043
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KEYWORDS
Signal attenuation

Modulation

Fiber lasers

Optical fibers

Thulium

Transmittance

Attenuators

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