Chip Scale Atomic Resonator Frequency Stabilization System With Ultra-Low Power Consumption for Optoelectronic...

Area of Science:

• Physics
• Atomic Physics
• Optoelectronics

Background:

• Optoelectronic oscillators (OEOs) are crucial for precise frequency generation.
• Existing stabilization methods often lack portability and consume significant power.
• Chip-scale integration of frequency standards remains a challenge.

Purpose of the Study:

• To present a long-term, chip-scale frequency stabilization scheme for OEOs.
• To demonstrate a portable and ultra-low power solution for OEO stabilization.
• To improve the fractional frequency stability of OEOs.

Main Methods:

• Utilizing a rubidium coherent population trapping (CPT) atomic resonator.
• Locking a single OEO mode to the (85)Rb 3.035-GHz CPT resonance.
• Employing an improved phase-locked loop (PLL) with a PID regulator for stabilization.

Main Results:

• Achieved a chip-scale frequency stabilization system for OEOs.
• Demonstrated fractional frequency stability of 6.2 ×10⁻¹¹ (1 s) and ~1.45 ×10⁻¹¹ (1000 s).
• The system has a compact physical package and low power consumption (400 mW).

Conclusions:

• The presented scheme offers a chip-scale, portable, and ultra-low power frequency stabilization approach for OEOs.
• This method avoids phase noise degradation common in injection-locking schemes.
• The rubidium CPT resonator provides a robust and stable reference for OEO frequency control.