Investigation of longitudinal spatial-hole burning in high-order laterally coupled distributed feedback lasers
Bibliographic record
Abstract
In this work, we numerically study the effect of high-orderλ /4 phase-shift grating in laterally-coupled distributed feedback (LC-DFB) lasers performance. It is well known that single-mode operation is improved by introducing λ/4 phase-shift grating in conventional DFB lasers. However, introducing λ/4 phase-shift region increases the optical intensity around this region and results in strong longitudinal spatial-hole burning (LSHB). To flatten the longitudinal carrier density distribution, we have numerically studied the effect of the radiation modes on high-order LC-DFB lasers using a modified time-domain travelling-wave algorithm. It is shown that, the degree of LSHB can be effectively reduced when considering high-order LC-DFB lasers with grating duty-cycle tailored to optimal values. LC-DFB laser cavity with high-order grating shows a strong non-uniformity of the carrier density distribution. However, as we finely engineer grating features, LSHB is highly reduced and high single mode suppression ration can be achieved.
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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 | 0.001 |
| 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 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| 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".