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Two-way optical communications system

  • US 5,305,133 A
  • Filed: 03/15/1993
  • Issued: 04/19/1994
  • Est. Priority Date: 02/16/1989
  • Status: Expired due to Term
First Claim
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1. An optical communications system comprising a transceiver arranged to provide two-way communication over an optical communications channel, the transceiver comprising:

  • a semiconductor light source,an optical signal-to-electrical signal detector, andan electrical signal frequency selective filter,the semiconductor light source and the detector being optically and physically aligned with each other and with the optical communications channel such that light from the communications channel passes through the light source and onto the detector together with light generated by the source which also acts on the detector,the semiconductor light source providing optical signals for transmission via the optical communications channel, andthe detector detecting optical signals both as transmitted by the source and as received via the optical communications channel through the source and converting said optical signals into electrical signals,wherein means are provided for modulating the output of the semiconductor light source with an RF carrier having a first frequency, andwherein said electrical signals are passed through the filter which filters out signals at said first frequency.

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