Optical module

The invention discloses an optical module. The optical module comprises a circuit board and an optical receiving sub-module, and a transmission grating, a first focusing lens, a micro electro mechanical system, a second focusing lens and a light receiving chip are sequentially arranged in the light receiving secondary module. The transmission grating is used for splitting the collimated light beam to obtain a plurality of split light beams. The first focusing lens is used for focusing the plurality of split light beams in different areas of the micro electro mechanical system to obtain a plurality of first converged light beams. The micro electro mechanical system is used for controlling the switches in all the areas to be turned on or turned off so as to reflect the first convergent light beams focused in the corresponding areas. The second focusing lens is used for converging the first converged light beam to obtain a second converged light beam. The light receiving chip is used for converting the second co