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1. (WO2018044500) ULTRA LOW NOISE PHOTONIC PHASE NOISE MEASUREMENT SYSTEM FOR MICROWAVE SIGNAL

Pub. No.:    WO/2018/044500    International Application No.:    PCT/US2017/045450
Publication Date: Fri Mar 09 00:59:59 CET 2018 International Filing Date: Sat Aug 05 01:59:59 CEST 2017
IPC: G01R 29/26
G01R 31/28
Applicants: IMRA AMERICA, INC.
Inventors: KUSE, Naoya
FERMANN, Martin, E.
Title: ULTRA LOW NOISE PHOTONIC PHASE NOISE MEASUREMENT SYSTEM FOR MICROWAVE SIGNAL
Abstract:
Systems and methods for precision phase noise measurements of radio frequency (RF) oscillators are provided. An RF signal under test can be modulated on a continuous wave (cw) laser carrier frequency via generation of modulation side-bands using an appropriate modulator. A photonic delay line can be implemented as a self-heterodyne detection system for the phase noise, allowing for photonic down-conversion of the phase noise measurement to direct current (DC). The self-heterodyne detection system allows detection outside of any 1/f noise issues. Ultra-low phase noise detection for RF frequencies in a range from below 1 GHz to beyond 100 GHz is enabled with a low noise floor in the whole frequency range. Higher-order modulation sidebands can further reduce the noise floor of the system. Ultra-low noise RF (microwave) output can be generated. The RF signal under test can be generated by a dielectric resonance oscillator or opto-electronic oscillator.