Optimization of primary Kerr optical frequency combs for tunable microwave generation

Area of Science:

• Optics and Photonics
• Microwave Engineering
• Nonlinear Optics

Background:

• Kerr combs are versatile optical frequency comb sources.
• Photodetection of Kerr combs can generate microwave signals.
• Optimizing microwave output power from Kerr combs is crucial for applications.

Purpose of the Study:

• To identify conditions for maximizing microwave output power from Kerr combs.
• To investigate the role of the sidemode-to-pump ratio in microwave generation.
• To understand the influence of pump laser parameters on comb states and microwave performance.

Main Methods:

• Theoretical analysis of Kerr comb states.
• Investigating the relationship between pump laser properties and comb characteristics.
• Experimental demonstration of optimized primary combs.

Main Results:

• Highest microwave output power is achieved at maximum sidemode-to-pump ratio.
• Pump laser power and frequency critically influence the sidemode-to-pump ratio for primary combs.
• Experimentally demonstrated primary combs with a sidemode-to-pump ratio of -2 dB.

Conclusions:

• Optimal Kerr comb states for high microwave power generation are identified.
• Efficient lightwave-to-microwave energy conversion is achieved through optimized comb states.
• The findings provide a pathway for improved phase noise performance in generated microwaves.