High-total-dose gamma and neutron radiation tolerance of VCSEL assemblies

Francis Berghmans; Marco Van Uffelen; Marc C. Decreton

doi:10.1117/12.452201

11 November 2002 High-total-dose gamma and neutron radiation tolerance of VCSEL assemblies

Francis Berghmans, Marco Van Uffelen, Marc C. Decreton

Proceedings Volume 4823, Photonics for Space Environments VIII; (2002) https://doi.org/10.1117/12.452201
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

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.

Citation Download Citation

Francis Berghmans, Marco Van Uffelen, and Marc C. Decreton "High-total-dose gamma and neutron radiation tolerance of VCSEL assemblies", Proc. SPIE 4823, Photonics for Space Environments VIII, (11 November 2002); https://doi.org/10.1117/12.452201

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available