Phase noise of electro-optic dual frequency combs

Area of Science:

• Optics and Photonics
• Spectroscopy
• Signal Processing

Background:

• Dual frequency combs are advanced tools for spectroscopy and signal processing.
• Relative phase noise between tone pairs critically impacts signal quality and performance.
• Previous studies noted signal degradation with increasing frequency differences, but phase noise scaling remained uncharacterized.

Purpose of the Study:

• To model and characterize the phase noise in a coherent electro-optic dual frequency comb system.
• To understand the scaling behavior of relative phase noise at different offset frequencies.

Main Methods:

• Development of a theoretical model for phase noise in dual frequency comb systems.
• Characterization of phase noise through simulation or experimental analysis (details not specified in abstract).

Main Results:

• At high offset frequencies, phase noise is an incoherent sum of individual comb timing phase noise, scaled by line number.
• At low offset frequencies, phase noise exhibits slower scaling due to the influence of a common frequency reference, indicating coherence.

Conclusions:

• The phase noise scaling in dual frequency comb systems is dependent on offset frequency.
• Coherence from a common frequency reference significantly reduces phase noise at low offset frequencies, enhancing system performance.