18.4 GHz evenly spaced flat multi-wavelength Brillouin–Raman comb fiber laser in the U-band region
Bibliographic record
Abstract
Abstract We report on a double spaced Brillouin–Raman comb fiber laser covering the spectral range of 1654–1677 nm. A 3 W fiber laser source with center wavelength at 1545 nm is used as the Raman pump for a 2.6 km dispersion compensation fiber to generate peak Raman gain at 13.2 THz away from the Brillouin pump (BP) which is around 1655 nm. A 5 mW narrow linewidth laser diode is utilized as the BP to generate multiwavelength Brillouin–Raman comb fiber laser (MBRCFL). A stable MBRCFL is generated with maximum bandwidth of 23 nm which contains 136 Brillouin Stokes with 0.168 nm spacing between BP and first Stoke corresponding to 18.4 GHz frequency spacing, an average power of 340 mW and optical signal to noise ratio of 26 dB. The output power fluctuation of less than 4% is measured over a period of 4 h. Moreover, the slope efficiency of 34% is achieved while the flat-amplitude bandwidth of about 17 nm is observed.
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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 | 0.000 |
| 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) | 0.001 | 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".