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Coherent optical heterodyne transmission system

  • US 5,267,074 A
  • Filed: 09/08/1992
  • Issued: 11/30/1993
  • Est. Priority Date: 01/22/1990
  • Status: Expired due to Fees
First Claim
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1. Coherent optical heterodyne transmission system comprisingat least a first and a second transceiving station interconnected by means of a glass fibre, each respective station comprisingno more than a single electrooptical converter, the electrooptical converter acting as transmitter and local oscillator for the respective station.an optoelectrical converter,optical coupling means coupling the optoelectrical converter to the glass fibre, which optical coupling means likewise feed a first portion of the light generated by the electrooptical converter to the optoelectrical converter and a second portion of the light generated by the electrooptical converter to the glass fibre;

  • andmodulation means, for modulating with an electrical modulation signal, the light fed to the glass fibre, the modulation means comprising control means for controlling the electrooptical converter in response to the electrical modulation signal, whereby an optical modulator is not necessary,wherein at least one of the first and second stations comprises means for obtaining the electrical modulation signal by modulating a baseband signal on a subcarrier, whereby transmitted and received modulation signals are distinguishable in the IF section of the station containing the means for obtaining.

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