Suppression of amplitude-to-phase noise conversion in balanced optical-microwave phase detectors
Maurice Lessing, Helen S. Margolis, C. Tom A. Brown, Patrick Gill and, Giuseppe Marra
TL;DR
This paper demonstrates a highly suppressed amplitude-to-phase noise conversion in a balanced optical-microwave phase detector, enabling ultra-low phase noise microwave signal generation from a commercial laser comb.
Contribution
It introduces a BOM-PD with an extremely low AM-PM conversion coefficient, significantly reducing phase noise in microwave generation.
Findings
AM-PM conversion coefficient of 0.001 rad
Generated 8 GHz microwave signals with -131 dBc/Hz at 1 Hz
Achieved phase noise of -148 dBc/Hz at 1 kHz
Abstract
We demonstrate an amplitude-to-phase (AM-PM) conversion coefficient for a balanced optical-microwave phase detector (BOM-PD) of 0.001 rad, corresponding to AM-PM induced phase noise 60 dB below the single-sideband relative intensity noise of the laser. This enables us to generate 8 GHz microwave signals from a commercial Er-fibre comb with a single-sideband residual phase noise of -131 dBc/Hz at 1 Hz offset frequency and -148 dBc/Hz at 1 kHz offset frequency.
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