C-Lens assembly element

The utility model discloses a C-Lens assembly element, which comprises a C-Lens and a glass tube, wherein the C-Lens is placed in the glass tube, one end of the C-Lens is a curved end surface, in addition, a gap is formed between the top point of the curved end surface and the end surface of one end of the glass tube, the other end of the C-Lens is arranged at the same level as the glass tube, and a window is also formed on the tube wall of the glass tube. The C-Lens assembly element can replace the existing self-focusing lens, the cost of wavelength division multiplex (WDM) devices is reduced, and meanwhile, the problem of insertion damage caused by difficult cleaning of the curved end surface in the existing C-Lens assembly element can also be solved.