A configuration for an optical device interface makes use of the employment of rigid pieces of optical waveguide disposed between a measuring location and a transmitting location in an optical device. The filter removes noise from a signal transmitted using a power line. The stopper film is made of an SiCN film having a low optical reflectance, thereby causing it to serve as an antireflective film when the photoresist film is exposed. The base activity class provides the base class support needed to build or develop activities derived from the base activity class.