A microprocessor includes a branch unit, a loadstore unit, an arithmetic logic unit, and a vector unit to execute a vector instruction. Each method uses its own set of local variables. The first coil 4 and the second coil 5 are arranged to be close to each other so that winding axis directions of the X-axis coil, the Y-axis coil, and the Z-axis coil are orthogonal to each other. The plurality of slots allow for air circulation below the heat sink and around the IC and other proximate components to increase heat dissipation. The vibration of the membrane is then coupled to a receiving or an output electrode. The present invention furthermore relates to an optical communication system comprising a transmitter, a receiver and a multimode optical fibre.