In a device control apparatus, a processor that operates according to software, an OS storage unit stores Operating Systems that operate on the processor, and a storage unit stores privileged software which operates on the processor. The device is adapted to be plugged into a wall outlet. The first tunable coupling member adjusts an amount of power of the optical signal that is divided onto the first and second tunable delay paths of the first differential delay. The yoke member is stamped in order to give it the desired thickness in highly stressed and lowly stressed regions.