Vertical Coupling Effect on Gain Bandwidth of Chirped InAs/InP Quantum Dot Structures
Bibliographic record
Abstract
Quantum dot (QD) devices are usually desired to have a broadband gain spectrum. An alternative solution to achieve a broadband gain in QD devices is to use multiple layers with different QD heights, which are stacked vertically, i.e. a chirped QD structure in the active region. In the chirped stacked QD structure, the vertical strain and electron coupling effect have a significant impact on the optical transition property and thus optical gain bandwidth. However, previous studies on the vertical coupling effect have mainly focused on uniformly stacked QD structures, and the chirped QD structures have not been investigated carefully. This work presents a detailed analysis of the vertical coupling effect in chirped QD structures (i.e. ascending and descending chirped structure) and its impact on the optical gain bandwidth of the active region. It is found that the descending chirped structure leads to a wider gain bandwidth, in particular at high current injection. A Fabry-Perot mode-locked laser with the descending chirped structure presents a better performance in pulse width and frequency comb lines compared to the ascending chirped structure.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".