There is disclosed an optical wireless transmission apparatus in which a pilot light emitting section of a receiving/emitting section sends a pilot light in a wavelength region of 930 nm to 960 nm to a target apparatus, and a light receiving device having a light receiving sensitivity only to the same...http://www.google.com.au/patents/US7336903?utm_source=gb-gplus-sharePatent US7336903 - Optical wireless transmission apparatus
