Sub-terahertz photonic frequency divider with a large division ratio based on phase locking

Area of Science:

• Photonics
• Microwave Engineering
• Optical Signal Processing

Background:

• High-frequency signal division is crucial for advanced communication and measurement systems.
• Existing methods often rely on complex and power-hungry electronic components.
• Achieving large division ratios at sub-terahertz frequencies presents significant technical challenges.

Purpose of the Study:

• To introduce a novel photonic frequency divider capable of handling microwave signals up to sub-terahertz frequencies.
• To demonstrate a large frequency division ratio using optical techniques.
• To provide a stable, cost-efficient, and flexible solution for frequency division in high-precision applications.

Main Methods:

• Utilizing a Fabry-Perot frequency comb, phase-locked to the input microwave signal.
• Employing intermediate-frequency detection and feedback control for phase locking.
• Operating without the need for high-speed electrical devices.

Main Results:

• Achieved frequency division for input signals from 50.10 GHz to 200.10 GHz, all down-converted to 2.5 GHz.
• Demonstrated a large frequency division ratio.
• Confirmed negligible phase noise at low offset frequencies, indicating superior long-term stability.
• Eliminated the requirement for high-speed electrical components.

Conclusions:

• The proposed photonic frequency divider offers a flexible, cost-efficient, and stable solution for high-frequency signal division.
• Its performance makes it suitable for the remote end of high-precision frequency transfer systems.
• The device overcomes limitations of traditional electronic frequency dividers.