The Acacia AC100M is a 100 Gigabits per second (Gbps) commercial, coherent optical transceiver module with digital signal processing (DSP) application specific integrated circuit (ASIC). The AC100M was characterized with noise-loaded input to simulate power-starved link operation on the receiver and decoder for performance testing. Gamma radiation and 65 MeV proton radiation test campaigns at Defense MicroElectronics Activity (DMEA) and UC Davis Crocker Nuclear Laboratory (CNL), respectively, were completed to assess single event effects (SEEs) and total ionizing dose (TID) effects on the AC100M. After exposure to gamma radiation with TID level of ~13.7 krad(Si), communication with the AC100M module was lost and power cycling of the module and evaluation board could not restore nominal operation. The AC100M ASIC survived and experienced no performance degradation from proton equivalent TID exposure up to 66.7 krad(Si) with proton radiation. After proton equivalent TID level of 101 krad(Si), the AC100M did not functional nominally after power cycling. The calculated AC100M ASIC proton SEE cross section was 4.39×10<sup>-10</sup> cm<sup>2</sup> at the 65 MeV proton energy level.
We assess the viability of a state-of-the-art 100G/200G commercial optical coherent DSP ASIC (16 nm FinFET CMOS technology) for space applications through heavy ion testing to (1) screen for destructive SELs and (2) observe for nondestructive heavy ion SEEs on the ASIC. The ASIC was exposed to heavy ion radiation while operating both optically noise-loaded uplink and downlink to an optical “ground” modem. There were no destructive SEEs, such as SELs, observed from the heavy ion radiation test campaign.