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LOW JITTER RF DISTRIBUTION SYSTEM

  • US 20110123200A1
  • Filed: 11/24/2009
  • Published: 05/26/2011
  • Est. Priority Date: 11/24/2009
  • Status: Active Grant
First Claim
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1. A timing signal distribution system comprising:

  • an optical frequency stabilized laser signal having an optical frequency ω

    op, wherein the laser signal is amplitude modulated at an rf frequency ω

    rf;

    a transmitter box (110) temperature controlled to about ±

    0.01°

    C. having a first optical port (111) to receive the laser signal, a second optical port (112) to transmit a first portion of the laser signal and receive a modified optical signal, and a third optical port (113) to output a second portion of the laser signal and at least a portion of the returned modified optical signal;

    a first optical fiber (14) having a first end and a second end, the first end coupled to the first optical port (111) to carry the first portion of the laser signal and the modified optical signal;

    a second optical fiber (24) having a first end and a second end, the first end coupled to the third optical port (113) to carry the second portion of the laser signal and the portion of the returned modified optical signal;

    a receiver box (130) temperature controlled to about ±

    0.01°

    C. having an optical receiver port (131) coupled at a second end of the first optical fiber (14) to receive the first portion of the laser signal and output the modified optical signal, a first electrical port (137) to receive an electrical frequency shift signal to shift the frequency of the first portion of the laser signal to provide the modified optical signal, and a second electrical port (139) to output an electrical signal on the basis of the first portion of the laser signal;

    a reference detector (234) at a second end of the second optical fiber (24) co-located with the receiver box (130) to output a detector signal on the basis of the modified optical signal carried over the second optical fiber (24);

    an optical delay sensing circuit (150) coupled to the reference detector (234) adapted to output a frequency signal to the first electrical port (137) of the receiver box (130) and output a data signal on the basis of the detected phase of the modified optical signal; and

    an rf phase detect and correct signal circuit (160) coupled to the receiver box second electrical port (139) and coupled to the optical delay sensing circuit (150) to receive the data signal, the rf phase detect and correct signal circuit (160) adapted to output a signal corresponding to a phase stabilized rf signal at the frequency ω

    rf on the basis of the data signal and the frequency received from the second electrical port (139).

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