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The optical sensors of the IceCube Neutrino Observatory are attached onvertical strings of cables. They were frozen into the ice in the deploymentholes made by hot water drill. This hole ice, to the best of our knowledge,consists of a bubbly central column, with the remainder of the re-frozen volumebeing optically clear. The bubbly ice often blocks one or several of thecalibration LEDs in every optical sensor and significantly distorts the angularprofile of the calibration light pulses. It also affects the sensors' responseto in-coming photons at different locations and directions. We present ourmodeling of the hole ice optical properties as well as optical sensor locationand orientation within the hole ice. The shadowing effects of cable string andpossible optical sensor tilt away from the nominal vertical alignment are alsodiscussed.

A calibration study of local ice and optical sensor properties in IceCube