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Hybrid spiral-ring microlaser vertically coupled to silicon waveguide for stable and unidirectional output
Optics Letters
|October 30, 2015
Summary
This study demonstrates a hybrid spiral-ring laser coupled to a silicon waveguide, achieving stable, unidirectional output by eliminating mode competition. This innovation enhances laser performance and power efficiency.
Area of Science:
- Optoelectronics
- Photonics
- Semiconductor Lasers
Background:
- Mode competition in traditional ring lasers leads to output instability.
- Unidirectional light output is crucial for integrated photonic devices.
Purpose of the Study:
- To demonstrate a hybrid spiral-ring laser with stable and unidirectional output.
- To eliminate mode competition between clockwise (CW) and counter-clockwise (CCW) modes.
- To integrate the laser with a silicon waveguide.
Main Methods:
- Theoretical simulation and experimental fabrication of a hybrid AlGaInAs/Si spiral-ring laser.
- Vertical coupling of the spiral-ring laser to a silicon waveguide.
- Analysis of mode coupling in the spiral resonator to suppress mode competition.
Main Results:
- Stable and unidirectional laser output achieved.
- Elimination of output power fluctuations caused by mode competition.
- A spiral-ring laser (30 μm radius, 5 μm width) showed a continuous-wave lasing threshold of 9.5 mA (1.1 kA/cm²).
- CCW output power was five times greater than CW output power.
Conclusions:
- The hybrid spiral-ring laser design effectively suppresses mode competition, enabling stable, unidirectional operation.
- Vertical integration with silicon waveguides is feasible, paving the way for advanced photonic circuits.
- The demonstrated device offers enhanced performance for integrated optoelectronic applications.
