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Pr3+ -doped Ge-S-I glasses and fibers for PDFA applications

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Abstract

Pr3+-doped Ge-S-I glasses have been synthesized. Their optical and thermal properties were studied in regard to the material requirements for 1.31 μm optical fiber amplifier. The glass composition Ge35 S56.5 I8.5 was selected as an optimum host for this application.. The measured 1G4 lifetime (368 μs) and quantum efficiency (82 %) in bulk samples of this composition are outstanding compared to these parameters measured in other candidates capable of fiberization. This glass host allows solubility of Pr3+ ions up to 2000 ppm/wt, which exceeds several times the practical level of Pr3+ doping limited by concentration quenching. Homogeneous glass rods with typical lengths more than 6 cm and Pr3+ concentrations 500 ppm/wt of the composition selected for drawing were produced. Fibers with diameter 200 μm and polymer coating were fabricated in more than 15 meters lengths. Fiber losses of 3 dB/m at 1.31 μm were measured in best samples.

© 1997 Optical Society of America

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