A real-time optical compensating apparatus reduces the PMD in an optical fiber by determining the principal states of polarization of the optical fiber and delaying one principal state of polarization with respect to the other. The rectifying and filtering unit receives an alternating current voltage, and generates a filtered primary DC voltage. This resolves cumbersomeness of management and enables flexible application distribution. The distance of stroke movement can be adjusted to accommodate molds of varying sizes. The node is coupled to the at least one device for sensing and controlling energy delivered to the device. The atomic beam is irradiated onto the thin film to break the carbon-carbon double bond.