The present invention relates to an optical module, and more particularly, to an optical module including an input / output optical fiber; A core transformer having one side coupled to one side of the input / output optical fiber; An array optical waveguide grating part having one side connected to the other side of the core conversion part; A quartz part coupled to one side of the other side of the optical waveguide grating part; And a light receiving portion and / or a light receiving portion for coupling input light and / or output light to the quartz portion, wherein a size of a core of the core of the input / output optical fiber is different from a core size of the optical waveguide grating portion, And the core on the other side of the core conversion section corresponds to the diameter of the core of the optical waveguide grating section.
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