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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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Modulation-free laser stabilization with aided acquisition for extended locking range.

Mohamad Hossein Idjadi, Farshid Ashtiani, Kwangwoong Kim

|April 12, 2025

Summary

This summary is machine-generated.

We developed a modulation-free laser stabilization system using a cavity-coupled Mach-Zehnder interferometer and aided acquisition. This integrated photonic chip significantly suppresses laser frequency noise and broadens the locking range for precision optical systems.

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Area of Science:

Photonics
Optical Engineering
Laser Physics

Background:

Stable lasers are crucial for precision optical systems, but conventional stabilization methods face limitations in noise suppression, scalability, and locking range.
Achieving long-term stability in lasers requires advanced techniques to manage phase noise and maintain consistent operation.

Purpose of the Study:

To propose and demonstrate a novel modulation-free laser stabilization system.
To improve laser frequency noise suppression and extend the locking range using integrated photonics.
To offer a compact and scalable solution for low-noise lasers.

Main Methods:

Integration of a cavity-coupled Mach-Zehnder interferometer (CCMZI) with an aided acquisition (AAQ) system.
Fabrication of the CCMZI-AAQ system on a low-loss silicon nitride (SiN) photonic integrated chip.
Experimental validation of the system's performance in noise suppression and locking range.

Main Results:

Achieved over 36 dB of laser frequency noise suppression at a 1 kHz offset frequency.
Extended the locking range to the full free spectral range (FSR) of 3.95 GHz, an order-of-magnitude improvement.
Demonstrated a compact (5.43 mm²) and scalable photonic chip solution.

Conclusions:

The developed CCMZI-AAQ system offers a significant advancement in laser stabilization technology.
The system provides a compact, scalable, and high-performance solution for integrated low-noise lasers.
Potential applications include fiber sensing, optical communication, and other precision optical systems.