A picowatt cryogenic radiometer (PCR) has been fabricated at the microscale level for electrical substitution optical fiber power measurements. The absorber, electrical heater, and thermometer are all on a micromachined membrane less than 1 mm on a side. Initial measurements with input powers from 50 fW to 20 nW show a response inequivalence between electrical and optical power of 8%. A comparison of the response to electrical and optical input powers between 15 pW to 70 pW yields a repeatability better than $\pm 0.3\%$ ($k=2$). From our first optical tests, the system has a noise equivalent power of $\approx 5\times 10^{-15}\mathrm{W}/\sqrt{\mathrm{Hz}}$ at 2 Hz, but simple changes to the measurement scheme should yield an NEP 2 orders of magnitude lower.

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