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 distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".