There is provided a mechanism for controlling a transmission of data in a fragmentation transmission mode. The frequency band may be subdivided into a plurality of ranges and a sample of detected potential channels selected for each range. This controlled motion of the locking stud allows a deck of the aircraft to deform under crash loads without imposing excessive loads on the passenger seat. A thickness of cladding h of each optical fiber is set to a value calculated in accordance with the following equation:claddingthickness\u2062\u2062h\u2264\xf72As a result, it is possible to emit a laser-beam with a high intensity that is required for functionality as a laser light source, for the purpose of raising resolution of an exposure apparatus. The two pairs of vias and the signal transmission pathway provide impedance matching to the signals.