Twin-mirror membrane distributed-reflector lasers using 20-μm-long active region on Si substrates
Optics Express
|February 7, 2018
Summary
We developed compact 20-μm twin-mirror membrane distributed-reflector (DR) lasers for optical interconnects. These lasers achieve low threshold current and high-speed modulation, enabling efficient chip-to-chip communication.
Area of Science:
- Photonics
- Optoelectronics
- Integrated Optics
Background:
- Chip-to-chip optical interconnects are crucial for high-performance computing.
- Miniaturized lasers with low power consumption are needed for dense integration.
Purpose of the Study:
- To demonstrate novel 20-μm-long twin-mirror membrane distributed-reflector (DR) lasers.
- To evaluate their performance for optical interconnect applications.
Main Methods:
- Fabrication of 20-μm-long DR lasers with distributed Bragg reflectors (DBRs).
- Utilizing a λ/4-phase shifted distributed feedback (DFB) section.
- Characterization of lasing properties and modulation performance.
Main Results:
- Achieved single-mode lasing at room temperature with a low threshold current of 0.39 mA.
- Demonstrated stable lasing wavelength determined by the DFB section.
- Measured a modulation current efficiency of 11.4 GHz/mA1/2.
- Successfully modulated the lasers at 25.8 Gbit/s with an energy cost of 163 fJ/bit.
Conclusions:
- The developed DR lasers are suitable for high-speed, low-energy chip-to-chip optical interconnects.
- The compact size and excellent performance pave the way for advanced optical communication systems.
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