Patent ID: 7400834

Claim:
An optical space transmission apparatus which performs a first communication with a remote apparatus via a light beam propagating through a space comprising: a communication section which performs a second communication with a plurality of remote apparatuses, the second communication being conveyed via a different communication medium than the first communication; an identification section which identifies a remote apparatus, from among the plurality of remote apparatuses configured to communicate using the first communication by performing the second communication; a control section which controls the optical space transmission apparatus so as to perform the first communication with only the remote apparatus identified by the identification section from among the plurality of remote apparatuses; and an optical system which performs the first communication, wherein the control section performs a control which sets a communication direction of the optical system to a direction of the identified remote apparatus; wherein the optical system comprises a reflection member which is directed to a direction which differs corresponding to each of the plurality of remote apparatuses, and the control section sets the reflection member to a direction corresponding to the identified remote apparatus; wherein, when a remote apparatus that has sent a communication request via the second communication is not registered with the transmission apparatus as a remote apparatus that is to communicate using the first communication, the remote apparatus that has sent the communication request is registered with the transmission apparatus; and when a remote apparatus that has not sent a communication request via the second communication is registered with the transmission apparatus as a remote apparatus that is to communicate using the first communication, the registration of the remote apparatus with the transmission apparatus is deleted.