Integrated electro-optical phase-locked loop for high resolution optical synthesis.

Area of Science:

• Integrated photonics
• Optical engineering
• Electrical engineering

Background:

• Electrical frequency synthesizers are widely used but optical counterparts face limitations in size, power, and cost.
• Existing optical frequency synthesizers are often bulky, power-hungry, and expensive, hindering broad adoption.

Purpose of the Study:

• To develop a compact, low-cost, and high-resolution optical frequency synthesizer.
• To demonstrate an integrated electro-optical phase locked loop (EOPLL) suitable for large-scale deployment.

Main Methods:

• Integration of photonic and electronic devices using a standard silicon-on-insulator (SOI) process.
• Design of a sophisticated integrated electronic-photonic architecture for optical synthesis.
• Utilizing on-chip optical delay and electronic frequency detection for phase and frequency locking.

Main Results:

• Demonstration of an integrated EOPLL with low power consumption (28.5 mW) and small chip area (2.4 mm²).
• Achieved tunable phase and frequency locking through on-chip optical delay and electronic assistance.
• The device is comparable to electrical synthesizers in terms of size and power.

Conclusions:

• The integrated EOPLL offers a reliable, low-cost solution for optical frequency synthesis.
• This technology enables large-scale deployment of optical synthesizers in various fields.
• Potential applications include low-cost optical spectroscopy, detection, sensing, and optical communication.