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The planned IceCube Upgrade, consisting of seven new instrumentation strings,will be installed at the South Pole within 2022/2023. The focus of this upgradeis calibration, reduction of systematic uncertainties and atmospheric neutrinophysics. Within this scope, the "Precision Optical Calibration Module" (POCAM)will be installed at a number of positions on these new strings, to act as acalibration light source. The POCAM is an in-situ self-calibrating, isotropic,nanosecond light source that emits flashes of adjustable intensity and pulseduration. The isotropy is achieved using a teflon integrating sphere whichfurther allows the calibration of the total number of emitted photons perpulse, using the integrated sensors. Prototypes have been deployed and operatedwithin the GVD telescope in Lake Baikal and within the STRAW experiment in thePacific Ocean. We present POCAM results and experiences from the GVD and STRAWinstallations as well as first IceCube sensitivity studies and the followingdesign prospects for this next-generation POCAM iteration.

The POCAM as self-calibrating light source for the IceCube Upgrade