Radiation hardness of electro-optic asymmetric Fabry-Perot modulators

Analog optical links for LHC experiments are being developed, using electro-optical modulators as front-end transmitters. In the inner trackers, these devices will be subject to a harsh radiation environment, combining ionizing radiation and hadrons, up to 10 Mrads and 10 ¹⁴ (neutron-equivalent)/cm ², over the experiment lifetime. The radiation hardness of the Asymmetric Fabry-Perot Modulator (AFPM) has been tested, with both kinds of radiations, up to LHC total doses and fluences. Results confirm a radiation hardness which qualifies the AFPM for application in the detector front ends.