In a bi-directional optical transceiver module, a first waveguide transmits a
optical signal received from a light source to a high reflection layer formed on
a waveguide substrate. A second waveguide extends from the optical fiber to the
high reflection layer. With a first mode coupling region formed by ends of the
first and second waveguides near the high reflection layer, the second waveguide
transmits the transmission optical signal mode-coupled from the first waveguide
to the optical fiber and receives the reception optical signal from the optical
fiber. A third waveguide extends from the optical detector to near an end of the
optical fiber. With a second mode coupling region formed by an end of the third
waveguide and the other end of the second waveguide, the third waveguide transmits
the reception optical signal mode-coupled from the second waveguide to the optical detector.