Structures and methods for fabricating high speed digital, analog, and combined digitalanalog systems using planarized relaxed SiGe as the materials platform. The watch band includes an integral casing portion that forms at least a part of a casing assembly for the watch. The traveling direction changer is disposed in parallel to the surface under measurement, and the direction of the optical axis of the collimator lens coincides with the direction of a normal to the surface under measurement.