FPE002D is a Fabry Perot etalon filter designed for optical filtering. In atomic physics and quantum optics research, it is desired to have a passive optical filtering tool to filter out the unwanted light but only with a small attenuation on the probe light by means of a difference in their frequency. FPE002D can provide about 36dB extinction ratio at 6.8GHz, it is suitable for experiment involved with rubidium atom. FPE002D is a plano-convex etalon with precise temperature control system that provides researcher the stable filtering performance more than 12 hours. Easy plug and play with a mK temperature adjustability will allows the user to optimize the output power of etalon easily. The detailed descriptions are shown in below sections.