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

Abstract
We describe the application cross-correlation method with dual photonic delay-line for homodyne phase noise measurement of the low-noise microwave oscillators. This method combines delay-line discriminator and cross correlation with use of low-loss kilometer-long photonic delay. By using 4.5 km optical fiber as photonic delay, we demonstrated a measurement noise floor of �158 dBc/Hz at 10 kHz offset without a reference oscillator.

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