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Optical wireless communication system

  • US 4,959,874 A
  • Filed: 11/09/1988
  • Issued: 09/25/1990
  • Est. Priority Date: 12/28/1987
  • Status: Expired due to Term
First Claim
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1. An optical wireless communication system comprising aplurality of terminals each having a transmitter for transmitting optical signals at a first carrier frequency and a receiver for receiving optical signals at a second carrier frequency, and aplurality of optical repeaters each having a plurality of transmitters, a plurality of receivers and means for determining the path and destination of optical signals, said plurality of optical repeaters being coupled so as to communicate optically with one or more of the terminals through a first optical wireless communication channel and to communicate optically with each of the other optical repeaters through a second optical wireless communication channel wherein each of said optical repeaters converts the carrier frequency of received optical signals from said first frequency to said second frequency to transmit said optical signals converted to said second frequency from said transmitter incorporated in each of said optical repeaters to each of the terminals and to each of the other optical repeaters coupled thereto when each of said optical repeaters receives said optical signals at said receiver of said optical repeater from one of said terminals through said first optical wireless communication channel, and each of said optical repeaters transmits optical signals from said transmitter incorporated in said optical repeater to all the terminals and to all the other optical repeaters coupled thereto except the transmitting optical repeater of the optical signals when said each of the optical repeaters receives said optical signals at the receiver thereof from the other optical repeater coupled to said receiver through said second optical wireless communication channel.

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