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Method for optical communications

  • US 5,576,871 A
  • Filed: 05/25/1995
  • Issued: 11/19/1996
  • Est. Priority Date: 07/25/1994
  • Status: Expired due to Term
First Claim
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1. A method for optical telecommunications comprising a step of transmitting an optical signal through an optical path (1) of an optical fiber (2) in a plurality of optical paths (1) laid in the form of a cable from the transmission side, applying an external signal to the optical path (1) to modulate the optical signal being transmitted therethrough for the plane of polarization and receiving the optical signal at the receiving side to determine the presence or absence of a modulated optical signal, characterized in that the optical signal is modulated by continuous pulses (a) at the transmitting side and a predetermined number (n) of pulses (a) are extracted within a given period of time in synchronism at the receiving side so that the presence of a modulated optical signal is acknowledged only when (m) or more than (m) pulses (a) are received within a set period of time (n≧

  • m), and further characterized in that the absence of a modulated optical signal is acknowledged even when the above defined number of pulses (a) are received within a set period of time if k or more than k (k≧

    1) noise signals (b) are found between any successive two of the received pulses (a).

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