Phase-modulated fiber optic telecommunications system

  • US 6,476,952 B1
  • Filed: 11/26/2001
  • Issued: 11/05/2002
  • Est. Priority Date: 01/17/2001
  • Status: Expired due to Term
First Claim
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1. A fiber optic data transmission system comprising:

  • a transmitter having a laser emitting a continuous wave light, the transmitter including a phase modulator phase modulating the continuous wave light and a control circuit controlling the phase modulator as a function of an electronic input data stream having a time delay, so as to create a phase-modulated optical signal;

    an optical fiber transmitting the phase-modulated optical signal; and

    a receiver, the receiver including an interferometer for receiving the phase-modulated optical signal, the interferometer having a first arm and a second arm, the second arm being longer than the first arm, the interferometer having an interferometric delay corresponding to the time delay and a phase difference imparted by the first and second arms, the control circuit imparting a phase to represent a binary zero or one as a function of the phase difference, the control circuit including a digital-to-analog converter having an output for altering the phase of the phase modulator.

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