Patent ID: 7203391

Claim:
An optical module comprising: a substrate having a first groove structure formed through etching along a first direction and a second groove structure formed through etching along a second direction; a wavelength division multiplexer disposed on the substrate, which allows light to be transmitted or to be reflected, depending upon the wavelength thereof; a light emitting element-side lens element disposed on the first groove structure; a light receiving element-side lens element disposed on the second groove structure; a light emitting element disposed near an end of the first groove structure, which generates light to be emitted to the outside via the light emitting element-side lens element and the wavelength division multiplexer; a light receiving element disposed near an end of the second groove structure, which receives incoming light from the outside via the wavelength division multiplexer and the light receiving element-side lens element; and a light transmitting substrate inserted between the substrate and the light receiving element, wherein: the incoming light is received at the light receiving element via the wavelength division multiplexer, the light receiving element-side lens element and the light transmitting substrate; a short wavelength pass filter is formed on one surface of the light receiving element-side lens element; and a long wavelength pass filter is formed on one surface of the light transmitting substrate.