Methods and systems for virtually representing devices at remote sites are provided. The second section includes a grating portion, such as a tilted chirped fiber Bragg grating. The first type is motivated by the desire to construct SLMs whose non-zero entries corresponded to locations where sources are present. The coil spring urges the vane rotor such that the vane rotor advances with respect to the chain sprocket. The individual semiconductor chips of the device are activated and deactivated in accordance with internal chip enable signals.