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Compact narrow-linewidth integrated laser based on a low-loss silicon nitride ring resonator
Optics Letters
|November 1, 2017
Summary
We developed a compact integrated laser using silicon nitride waveguides and a III-V gain chip. This laser achieves a narrow 13 kHz linewidth with low output power, ideal for integrated photonics.
Area of Science:
- Photonics
- Materials Science
- Electrical Engineering
Background:
- Integrated lasers are crucial for optical communication and sensing.
- Achieving narrow linewidths in compact laser designs remains a challenge.
- Silicon nitride waveguides offer low loss and high confinement for integrated photonic devices.
Purpose of the Study:
- To design and demonstrate a compact, narrow-linewidth integrated laser.
- To leverage silicon nitride waveguides and microring resonators for enhanced laser performance.
- To achieve a sub-millimeter laser cavity with a narrow linewidth.
Main Methods:
- Coupling a III-V gain chip to low-loss silicon nitride waveguides.
- Utilizing a high-Q microring resonator as a cavity output mirror, filter, and delay element.
- Employing a highly confined optical mode for compact bends and low loss.
Main Results:
- Demonstrated a compact, sub-millimeter silicon nitride laser cavity.
- Achieved a narrow laser linewidth of 13 kHz.
- Obtained 1.7 mW output power at approximately 1550 nm wavelength.
Conclusions:
- The integrated laser design successfully combines compact size with narrow linewidth.
- The use of silicon nitride waveguides and microring resonators is effective for high-performance integrated lasers.
- This work paves the way for advanced integrated photonic systems requiring stable, narrow-linewidth light sources.
