Optical modulator and optical module including the same

1. An optical modulator comprising:

a lower clad layer;

an optical transmission line extending in a first direction on the lower clad layer; and

an upper clad layer on the optical transmission line and the lower clad layer,

wherein the optical transmission line comprises graphene,

wherein the optical transmission line comprises an input region, a modulation region, and an output region with respect to the first direction,

wherein the modulation region of the optical transmission line is interposed between the input region and the output region, and extended wider than the input and output regions in a second direction crossing the first direction.

2. The optical modulator of claim 1 , wherein the modulation region comprises:

a guide region disposed between the input and output regions and having the same linewidth as those of the input and output regions; and

a pad region connected to both sides of the guide region in the second direction.

3. The optical modulator of claim 2 , further comprising pad electrodes connected to top portions or bottom portions of the pad regions.

4. The optical modulator of claim 3 , further comprising signal interconnections connected to the pad electrodes.

5. The optical modulator of claim 4 , wherein the signal interconnections comprises:

an interconnection layer disposed on the upper clad layer or beneath the lower clad layer; and

a contact layer penetrating through the upper or lower clad layer, and connected to the upper clad layer and the pad electrodes, or the lower clad layer and the pad electrodes.

6. The optical modulator of claim 1 , further comprising optical fibers connected to the optical transmission line of the input and output regions.