| 摘要 |
A DIGITAL OPTICAL COMMUNICATION METHOD COMPRISING THE STEPS OF : GENERATING A DIGITAL MODULATED OPTICAL SIGNAL IN AN OPTICAL TRANSMITTING STATION, WHICH SIGNAL CORRESPONDS TO A FIRST ELECTRIC INPUT SIGNAL CARRYING A PIECE OF INFORMATION; FEEDING THE MODULATED OPTICAL SIGNAL TO AN OPTICAL-FIBRE LINE; RECEIVING THE MODULATED OPTICAL SIGNAL TRANSMITTED FROM THE OPTICAL-FIBRE LINE AT AN OPTICAL RECEIVING STATION, CONVERTING IT TO AN ELECTRIC FORM AND THEREAT GENERATING A SECOND DIGITAL ELECTRIC SIGNAL; WHEREIN THE MODULATED OPTICAL SIGNAL IS CODED IN A SEQUENCE OF ELEMENTARY INFORMATION UNITS AT A FIRST FREQUENCY AND WHEREIN THE STEP OF GENERATING A SECOND DIGITAL ELECTRIC SIGNAL COMPRISES DETECTING IN SAID CONVERTED SIGNAL, AN ELECTRIC SIGNAL HAVING A SECOND FREQUENCY HIGHER THAN THE FIRST FREQUENCY AND RECOGNIZING INSAID DETECTED SIGNAL, THE PHASE OF AN ELECTRIC SIGNAL AT THE FIRST FREQUENCY BY COMPARING A RECEIVED SEQUENCE OF ELEMENTARY INFORMATION UNITS WITH AT LEAST ONE REFERENCE SEQUENCE AND VERIFYING THEIR CORRESPONDENCE TO A PREDETERMINED CONDITION. (FIG. 6)
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