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Proceedings Paper

High-total-dose gamma and neutron radiation tolerance of VCSEL assemblies
Author(s): Francis Berghmans; Marco Van Uffelen; Marc C. Decreton
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Paper Abstract

Optical fiber technology is seriously considered for communication and monitoring applications during the operation and maintenance of future thermonuclear fusion reactors. Their environment is characterized, in particular, by possibly high gamma dose-rates and total doses in excess of 10 MGy. In addition, the maintenance equipment might be stored in close vicinity of the reactor during its operation and therefore the communication devices might also be exposed to a substantial neutron fluence. The feasibility of applying photonic technology in these radiation fields therefore needs to be assessed. Whereas many reports deal with the radiation behavior of a variety of fiber-optic devices, only little information is available on the radiation tolerance at high total dose (e.g. > 1 MGy). We describe our recent results obtained on vertical-cavity surface-emitting laser (VCSEL) assemblies. We have conducted high total dose (up to 20 MGy) irradiation experiments on such devices, which confirmed their excellent gamma radiation hardness. The optical power loss at nominal forward current was less than 2 dB and the threshold current remained unaltered. We have also irradiated these devices with neutrons inside the BR1 reactor (SCK•CEN, Mol, Belgium) up to a total fluence on the order of 1015 n∙cm-2. The response of VCSELs to neutrons is, as expected, different from that to gamma radiation. VCSELs previously exposed to gamma rays exhibited an accelerated degradation under neutron radiation compared to not pre-irradiated devices. The beneficial effect of applying a continuous forward bias to the VCSELs is also evidenced.

Paper Details

Date Published: 11 November 2002
PDF: 10 pages
Proc. SPIE 4823, Photonics for Space Environments VIII, (11 November 2002); doi: 10.1117/12.452201
Show Author Affiliations
Francis Berghmans, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)
Univ. of Brussels (Belgium)
Marco Van Uffelen, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)
Marc C. Decreton, SCK-CEN-Belgian Nuclear Research Ctr. (Belgium)

Published in SPIE Proceedings Vol. 4823:
Photonics for Space Environments VIII
Edward W. Taylor, Editor(s)

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