Phase-change material-based external cavity lasers for optical communications

Area of Science:

• Photonics and Optical Engineering
• Materials Science
• Telecommunications

Background:

• External-cavity lasers are crucial for tunable optical systems.
• Phase-change materials offer unique optical properties for device applications.
• Silicon nitride waveguides provide a robust platform for integrated photonics.

Purpose of the Study:

• To propose and simulate a novel external-cavity laser architecture.
• To leverage the phase-change properties of antimony trisulfide (Sb2S3) for tunable lasing.
• To achieve broad wavelength tuning across the C-band with high channel selectivity.

Main Methods:

• Integration of a silicon nitride (Si3N4) waveguide Bragg grating with antimony trisulfide (Sb2S3).
• Utilizing the refractive index contrast between amorphous and crystalline states of Sb2S3.
• Simulating the laser architecture for wavelength tuning range and channel spacing.

Main Results:

• Demonstrated stable and selective lasing at target wavelengths.
• Achieved a broad wavelength tuning range covering the entire C-band.
• Simulated channel spacing of approximately 0.8 nm between adjacent wavelengths.

Conclusions:

• The proposed external-cavity laser architecture enables efficient and precise wavelength tuning.
• The design shows significant potential for improving optical communication systems.
• Offers enhanced network flexibility and resource utilization efficiency.