Patent ID: 8155914
Filing Date: 2012-04-10
Classification: G01R,H04B

Abstract:
1. A device for measuring a phase noise in a signal, comprising: an input port that receives an oscillation signal from an oscillator under test; a first photonic signal processing branch circuit that processes the oscillation signal to produce a first branch output signal; a second photonic signal processing branch circuit that processes the oscillation signal to produce a second branch output signal, wherein the first and second photonic signal processing branch circuits share a common optical module that includes a shared laser producing continuous wave laser light at first and second wavelengths, a shared optical modulator that modulates the laser light at the first and second wavelengths to produce modulated laser light that carries the oscillation signal, a shared optical delay that receives the modulated laser light from the shared optical modulator and a wavelength-selective optical device that separates the modulated laser light output by the shared optical delay into a first modulated laser beam at the first wavelength that is processed by the first photonic signal processing branch circuit to produce the first branch output signal and a second modulated laser beam at the second wavelength that is processed by the second photonic signal processing branch circuit to produce the second branch output signal; and