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Photobleaching Effects In Step Index Pure Silica Optical Fibers During In-Situ Irradiation At Low Temperatures

1988; SPIE; Volume: 0867; Linguagem: Inglês

10.1117/12.965059

1996-756X

A.H. Johnston, B. D. Evans, M.P. Baze, Roger A. Greenwell,

Photonic Crystal and Fiber Optics

This paper investigates photobleaching at a low temperature in a multi-mode step index pure-silica-core optical fiber. Radiation-induced attenuation and subsequent recovery were measured over a wide range of transmitted optical power levels. These measurements were performed at a wavelength of 850 nm and a temperature of -55 °C using the NATO/FOTP-49 test procedures. When low levels of optical power were used, the maximum attenuation increased by a factor of ten and the recovery time increased by a factor of thirty compared with results at high optical power. Complete recovery required several hours at the lowest optical powers.