Dual photonic-delay line cross correlation method for phase noise measurement

  title={Dual photonic-delay line cross correlation method for phase noise measurement},
  author={Ertan Salik and Nan Yu and Lute Maleki and Enrico Rubiola},
  journal={Proceedings of the 2004 IEEE International Frequency Control Symposium and Exposition, 2004.},
We describe the application of a cross-correlation method with dual photonic delay-line for homodyne phase noise measurement of low-noise microwave oscillators. This method combines a delay-line discriminator and cross correlation with the use of a low-loss kilometer-long photonic delay. By using a 4.5 km optical fiber as a photonic delay, we demonstrated a measurement noise floor of -158 dBc/Hz at 10 kHz offset without a reference oscillator. 


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