Provided is a surface emitting laser array using a photonic crystal, which allows an active layer to be shared without disconnecting the active layer between the individual surface emitting lasers adjacent to each other, and enables high-density arraying easily. The pieces can be simply and easily assembled and disassembled with common tools and with no specialized knowledge or ability. The boundary line may be linear and extend through the origin of the graph with a slope of 0. , from the EAS, and to notify the user of the emergency alert. Each status bit and its corresponding shadow status bit is always loaded with the same data.