A bearing assembly for a first part that rotates with respect to a second part may include a slewing bearing having an axis of rotation and inner and outer races concentric with the axis of rotation. The cut off wavelength is controlled to allow single mode operation over a wavelength range that extends from about 1340 nm to 1650 nm. A flexural model based on the deformation characteristics calculates the dynamic displacement. The chip also includes capacitor storages formed on second and third second polycrystalline silicon layers.