A refueling system on an aircraft comprises a fuel hose coupled to the aircraft, a drogue coupled to the fuel hose, an air data computer, and a drogue canopy controller coupled to the drogue canopy. As a result, the thin film is evaporated or ablated depending on the periodic optical intensity, thereby a diffraction grating, which has the same period as that of the varying optical intensity, is formed on the glass substrate. Additionally, a physical connectivity test of the video and data network is automatically performed. The optical modules and the module case are unified. The dynamic spreader system may automatically adjust the amount of the spreading in response to changes in the weight, shape, or orientation of contents within the hammock base.