Femtosecond pulse generation in a C-band quantum dot laser
Bibliographic record
Abstract
We have demonstrated femtosecond pulses from a passive single-section monolithic InAs/InP quantum-dot (QD) semiconductor laser with the active length of 456 µm and the ridge width of 2.5 µm in the C-band wavelength range from 1528 nm to 1565 nm. The transform-limited Gaussian-pulses are generated at the 92-GHz repetition rate with the 312-fs pulse duration without any pulse compression scheme. The average output power is larger than 13.2 mW for the injection current of 60 mA. And the lasing threshold current and external differential quantum efficiency are 17.2 mA and 38%, respectively. The mode-beating linewidth of the proposed QD mode-locked laser (MLL) was measured less than 20 KHz. We have interpreted that four-wave-mixing (FWM) process and other nonlinear effects within the QD waveguide gain materials make the major contributions to lock the phase the longitudinal modes of the QD Fabry-Perot cavity together to achieve this strong self-pulsation process.
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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 | 0.000 | 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 | 0.001 |
| 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".