Vertically Coupled Partially Tapered Ridge Waveguide Semiconductor FP Laser With Improved Divergence Angles
In this work, we present a semiconductor FP laser design with significantly reduced divergence angles particularly in the vertical direction. The laser has a pair of vertically stacked, propagation constant unmatched twin waveguides that is coupled by a tapered ridge at the output end. As such, the...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2020-01-01
|
| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9212553/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | In this work, we present a semiconductor FP laser design with significantly reduced divergence angles particularly in the vertical direction. The laser has a pair of vertically stacked, propagation constant unmatched twin waveguides that is coupled by a tapered ridge at the output end. As such, the laser has a significantly extended mode profile at the output section while the light propagation in the main section is not affected. Our simulation result shows that the divergence angles can be reduced to 13° <inline-formula><tex-math notation="LaTeX">$ \times $</tex-math></inline-formula> 14° (horizontal <inline-formula><tex-math notation="LaTeX">$ \times $</tex-math></inline-formula> vertical), as opposed to typical values of 20° <inline-formula><tex-math notation="LaTeX">$ \times $</tex-math></inline-formula> 29° in conventional ridge waveguide laser structures without a sport size convertor integrated. This design does not need any regrowth, with no appreciable penalty brought to other laser characteristics either. |
|---|---|
| ISSN: | 1943-0655 |