Patent ID: 7290942

Claim:
An optical transceiver module for emitting transmitting light along a predetermined axis and receiving light having propagated along the predetermined axis, said optical transceiver module comprising: a mount substrate disposed so as to intersect with the predetermined axis and having first and second principal surfaces facing each other; a transmitting semiconductor laser mounted on the first principal surface and configured to emit light of a first wavelength; a receiving photodiode mounted on the predetermined axis and on the second principal surface and configured to receive light of a second wavelength; a communicating hole provided in a region of the mount substrate where the receiving photodiode is mounted, and letting the first and second principal surfaces communicate with each other; a first filter disposed on the predetermined axis and in a region intersecting with the first principal surface, and configured to reflect the light of the first wavelength and transmit the light of the second wavelength; a lens for condensing the transmitting light and the receiving light, said lens being located on the predetermined axis so that the first filter is interposed between the receiving photodiode and the lens; and a casing for housing the mount substrate; the casing comprising: a first casing portion located on the first principal surface side; and a second casing portion located on the second principal surface side, wherein the mount substrate is housed in the casing and sandwiched between the first casing portion and the second casing portion, and wherein the light of the first wavelength having been emitted from the transmitting semiconductor laser and propagating along the first principal surface is reflected by the first filter, condensed by the lens and emitted as the transmitting light along the predetermined axis, and wherein the light of the second wavelength as the receiving light having propagated along the predetermined axis is condensed by the lens, transmitted by the first filter and travels through the communicating hole to be received by the receiving photodiode.