The present invention provides a method and the apparatus thereof to protect MOS components from antenna effect. The apparatus can include a photosensitive surface and a raster output scanner optically coupled to the photosensitive surface, an integrated scan detector configured to detect the beams from the raster output scanner and configured to produce a signal based on the beams detected from the raster output scanner, and a beam calibration controller coupled to the integrated scan detector. The dummy patterns are used as masks when a base film is subjected to a laser process. The first switching element is turned on and the second switching element is turned off in a first period of the charging period and a second period subsequent to the first period, and the first switching element is turned off and the second switching element is turned on in a third period of the charging period subsequent to the second period. In assembly, the two optical fibers are received in the fiber optic terminal through the passageways to connect with optical components in the housing, and the fiber optic terminal is tightly received in the housing.