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Optical wireless data transmission system and optical wireless data transmitting/receiving apparatus

  • US 5,600,471 A
  • Filed: 04/27/1995
  • Issued: 02/04/1997
  • Est. Priority Date: 04/28/1994
  • Status: Expired due to Term
First Claim
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1. An optical wireless data transmission system providing simultaneous bidirectional transmission of data by optical signals between at least a first optical signal transmitting and receiving apparatus and a second optical signal transmitting and receiving apparatus, each of said first and second optical signal transmitting and receiving apparatuses including photoemissive means for producing a transmitted optical signal and photoreceptive means for converting a received optical signal to a reception signal, wherein each of said first and second optical signal transmitting and receiving apparatuses comprises:

  • isolating means for optically isolating said photoreceptive means thereof from an optical signal emitted by said photoemissive means thereof; and

    means for generating said optical signal from a biphase code electrical signal by baseband modulation of an intensity of light which is emitted by said photoemissive means thereof,wherein said data are conveyed as data packets, and wherein each of said first and second optical signal transmitting and receiving apparatuses comprises means for inserting into said optical signal generated by said photoemissive means thereof, within each of respective vacant intervals between said data packets, a pilot signal having an amplitude which is similar to an amplitude of said optical signal within said data packets.

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