Narrow linewidth 1.52 µm InAs/InP quantum dot DFB lasers
Bibliographic record
Abstract
We have grown, fabricated, and tested single mode ridge-waveguide distributed feedback lasers utilising InAs/InP quantum dots as the gain medium. The growth of quantum dots on InP substrates allows us to reach the important 1.55 µm telecommunications wavelength range, in this case lasing at 1.52 µm. The quantum dot gain medium was grown using chemical beam epitaxy, and the top cladding regrown after grating patterning using metal-organic-chemical vapour-deposition. No shift in the photoluminescence peak wavelength of the dots was observed following top cladding regrowth. Ridge waveguide lasers were fabricated with ridge widths of 3 µm and cleaved to 500 µm and 1 mm cavity lengths. The facets were coated to provide reflectivities of 65% and 2%. In continuous wave (cw) operation single-mode output was observed with a side mode suppression ratio greater than 61 dB, and an output power of 9.7 mW at an injection current of 150 mA. Operation up to 80°C was achieved. The relative intensity noise was measured to be less than −154 dB/Hz from 10 MHz to 10 GHz, and the optical linewidth to be less than 150 KHz for the best devices.
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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 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.017 | 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".