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Upgraded particle colliders will require high bandwidth readout capable of withstanding extremely high levels of radiation. Optical links Silicon photonics is a promising solution, but conventional high-speed modulators cannot survive radiation damage. Preliminary results show hardening techniques capable of enduring 1 Grad of total ionizing dose, but without yet demonstrating high speed modulation.
Ring resonator modulators were designed with various radiation hardness by design techniques and irradiated. Most promising is a highly doped ring resonator modulator with an 18 GHz bandwidth that survived 300 MRad of total ionizing dose.
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Evan Chansky, Aaron Maharry, Thomas Dorch, Steven Estrella, Maurice Garcia-Sciveres, Clint Schow, "Radiation-hardened silicon photonic modulators for detector readout," Proc. SPIE PC12426, Silicon Photonics XVIII, PC1242607 (13 March 2023); https://doi.org/10.1117/12.2650651