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A 70-GHz bandwidth commercial photodiode has been coupled to W-band waveguide and used as a photomixing source from 75 to 170 GHz. Maximum power conversion efficiency of 1.8% was obtained at 75 GHz, where an optical input of +10 dBm yielded a nonsaturated millimeter-wave (mm-wave) power of 7.5 dBm. Optimizing the photomixer backshort tuning at individual frequencies showed that the mm-wave power decreased with frequency to a level of 30 dBm at 170 GHz. Fixed tuning allowed the generation ofdoi:10.1109/68.980513 fatcat:zpsjcqlog5bvlmpq7tg4gu4drq