Abstract: An electrostatic movable micro mirror chip includes an upper mirror plate and a lower electrode plate positioned and jointed together via pairs of fitting solder and positioning grooves. It improves the optical quality of the mirror chip by a lower joining temperature. The fitting and jointing achieves easy positioning and interconnection. The fabrication time and cost is less. The mirror in the mirror chip is plated with metallic coating on both sides so as to balance the stress and improve its flatness.

Abstract: A mechanism for fixing optical element that is applied to construct the optical element in an wavelength division multiplexer (WDM), or an dense wavelength division multiplexer (DWDM), the mechanism comprising a filter letting a beam of light with targeted wavelength pass through and in the meantime reflect the other beams of light (it is same on the other hand) and a holder being deployed in an optical pate of the WDM, which is tubular with a hollow part and having an incident end and an emitting end, and further there is a carry surface to let the filter be pasted on.