A stackable bed platform includes a primary sleep surface and a secondary sleep surface. Accordingly, carriers C generated near the rear surface 11a of the semiconductor substrate 11 are reliably captured by the first depleted layers A1. A directory representation of the source PC’s hard drive is transmitted to the user at his or her remote location. Signals are periodically transmitted from the reference and object tags. In accordance with the present invention, there provided an optical device, including: a substrate having a groove with a tilted surface, wherein the groove has a mirror plane on the tilted surface; a light emitting means aligned to the substrate; and an optical fiber including a tilted incident plane, wherein a reflected light from the mirror plane is incident to the tilted incident plane. Particularly the use of such compound in manufacturing medicaments for treatment of diabetes of type 1 or type 2 is provided.