DVP-101 Fiber coupler mainly applied to coupling of two optical cables in the experiment and construction and test of optical cables. Adopting high precise V-groove to set optical fiber achieve an accurate and straight connection of two fibers. The loss is less than 0.5 dB (same single mode fiber). The volume is 80*50*20mm3. The weight is 280g. Having only two pressing boards, makes operating simple, shortcut, convenient. It can be applied into all kinds of optical fiber and its property index enjoy similar level with the foreign country.