Numerical Study of a DFB Semiconductor Laser and Laser Array With Chirped Structure Based on the Equivalent Chirp Technology
Bibliographic record
Abstract
We propose that a Bragg grating with a chirp profile in a semiconductor distributed feedback (DFB) laser can be designed and fabricated through nonuniform sampling of a uniform grating based on the equivalent chirp technology (ECT). The characteristics, including the relationship between the input current and output power, the light distribution within the laser cavity, the lasing spectrum, and the linewidth, are numerically analyzed and compared with a DFB laser with a true chirped grating. The study shows that the proposed DFB laser with an equivalent chirp provides an identical performance to that of a conventional DFB laser. Based on the ECT, different chirp gratings in a DFB laser array can also be fabricated by simply using different sampling functions, with the grating period in all gratings kept constant. The key advantage of the proposed technique is that a DFB laser or laser array can be fabricated based on the conventional holography technology, which would simplify the fabrication.
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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 | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".