OPTICAL WIRELESS UNIT, FREE SPACE OPTICAL WIRELESS CONTROL UNIT AND FREE SPACE WIRELESS CONTROL METHOD

摘要

An optical wireless unit including an optical circulator, a collimator, and a lens is provided. The collimator is configured to receive an optical signal via a first port of the optical circulator. The collimator is coupled with a second port of the optical circulator and is configured to transmit the optical signal into air to form a first free space optical wireless signal. The lens is coupled with the collimator and a third port of the optical circulator and is configured to receive and focus a second free space optical wireless signal to the collimator. The first free space optical wireless signal has a wavelength λ₀, the second free space optical wireless signal has a wavelength λ_N, and N is a positive integer.