No abstract

With the increasing use of optical data links it becomes essential to test for radiation vulnerability not only the transmission support -fiber and cable -but also fiber-end electro-optical components that could be exposed to hostile environment. Numerous silica-based fibers were currently tested over the world. Present paper gives a comparison of radiation resistance between two gradient index multimode fibers with and without phosphor in core. From that result a technological change in standard 1.3 m wavelength light-emitting diodes (LED), injection-laser diodes (LD) and p-i-n photodiodes (PD) was made. Results of tests under steady-state medium dose-rate Co° exposure show a significant enhancement of improved components optical performance. Especially LED and PD present a small degradation of optical caracteristics for 50 kGy (for a dose-rate of about a few 10 Gy h1). Multicomponent laser-diode modules (LDM) were extensively tested up to about 20 kGy. Two degradation processes clearly appear : a wrong decrease of stimulated light emission after 3-4 kGy and a bad operation of thermoelectric element cooler beyond about 10 kGy. Hardened optical data links are now able to withstand successfully some nuclear environments.

No abstract

No abstract

No abstract