Bi-directional wireless optical communication apparatus and method thereof

A wireless optical communication apparatus for performing bi-directional optical transmission in a free space, the wireless optical communication apparatus comprising:

• a first optical system configured to transmit data through a downlink scheme;
• and
• a second optical system configured to receive the data from the first optical system and transmit a control signal to the first optical system through an uplink scheme,
• wherein each of the first optical system and the second optical system transmits and receives the data and the control signal through a single port,
• wherein the first optical system transmits the data together with a tracking optical signal for optical alignment through the downlink scheme,
• wherein the second optical system comprises a second tracking-purpose optical signal receiving unit configured to receive the tracking optical signal,
• wherein the first optical system converts the data and the tracking optical signal into a single optical signal by a downlink optical transmitting unit and a wavelength division multiplexing (WDM) filter and outputs the single optical signal to a free space;
• and
• the second optical system divides the data from the tracking optical signal by a WDM filter and a beam splitter, receives the data through a downlink optical receiving unit, and receives the tracking optical signal through the second tracking-purpose optical signal receiving unit,
• wherein the first optical system comprises a first downlink stage to which an optical connector connected to an optical fiber for transferring the optical signal output through the downlink optical transmitting unit is attached and which is configured to adjust a travelling distance of the optical signal by moving in X-axis, Y-axis, and Z-axis directions.