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Optical telecommunication method providing a transmitting and receiving service channel

  • US 6,038,047 A
  • Filed: 03/20/1996
  • Issued: 03/14/2000
  • Est. Priority Date: 03/28/1995
  • Status: Expired due to Term
First Claim
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1. A digital optical telecommunication method comprising the steps of:

  • receiving a first electric signal carrying a piece of information at an optical transmission station and generating a digital modulated optical signal at a predetermined wavelength, corresponding to said electric signal;

    feeding said modulated optical signal to an optical-fibre line having a predetermined unitary-attenuation value at said wavelength; and

    receiving said modulated optical signal transmitted from said optical-fiber line at a given optical-power level, at an optical receiving station, converting the received optical signal to an electric form and at the optical receiving station generating a second digital electric signal;

    characterized in that;

    said step of generating a modulated optical signal comprises coding said piece of information of said first electric signal in a sequence of elementary information units individually associated with said piece of information, said units following one after the other according to a first predetermined cyclic time rate, andsaid step of generating a second digital electric signal comprising detecting in said converted signal, an electric signal having a second cyclic time rate higher than said first cyclic time rate and recognizing in the detected signal, the phase of an electric signal at said first time rate by comparing a receiving sequence of elementary information units with at least one reference sequence and verifying the correspondence of the result of said comparison at a given condition.

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