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Heterogeneously integrated single-mode III-V-on-TFLN lasers enabled by narrowband Bragg gratings
Optics Letters
|February 27, 2026
Summary
Researchers developed new electrically pumped lasers on thin-film lithium niobate (TFLN) using III-V materials. This breakthrough enables integrated photonic circuits with tunable laser sources for advanced optical systems.
Area of Science:
- Photonics
- Materials Science
- Integrated Optics
Background:
- Thin-film lithium niobate (TFLN) is a promising platform for integrated photonic circuits.
- Developing on-chip, electrically pumped laser sources for TFLN remains a significant challenge.
Purpose of the Study:
- To demonstrate heterogeneously integrated single-mode III-V-on-TFLN lasers.
- To achieve controlled lasing wavelength selection in the C-band for TFLN-based lasers.
Main Methods:
- Utilized a narrowband Bragg grating and Sagnac loop reflector (SLR) for wavelength-selective feedback.
- Employed precise tailoring of the distributed Bragg reflector (DBR) grating period for wavelength control.
Main Results:
- Achieved on-chip output power of approximately 1.15 mW.
- Maintained single-mode emission with a side-mode suppression ratio exceeding 35 dB.
- Demonstrated controlled lasing wavelength selection in the C-band.
Conclusions:
- Established the feasibility of electrically pumped laser sources on the TFLN platform.
- Provided a scalable pathway for fully integrated TFLN-based transmitters and reconfigurable photonic systems.
