Optical frequency-dependent opposite effective acoustic velocity dispersion in stimulated Brillouin scattering
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Bibliographic record
Abstract
Optical fibers serve not only as optical waveguides but also as acoustic waveguides, a dual functionality stemming from their structural properties and further enhanced by doping techniques. The effective velocity dispersion refers to the variation of acoustic mode velocity as a function of acoustic wavelength or frequency. In the process of stimulated Brillouin scattering (SBS), it has long been considered that the effective velocity dispersion of all excited acoustic modes follows the same trend as each other in a fiber, primarily determined by acoustic waveguide dispersion. However, our recent study, based on accurate measurements of group/effective refractive indices and acoustic frequencies, reveals that the first two acoustic modes in a dispersion-shifted fiber exhibit opposite dispersion. In particular, over the pump wavelength range from 1535 to 1590 nm, the effective acoustic velocity of the fundamental mode decreases by 1.7 m/s as the acoustic frequency lowers, while the second mode increases by 3.1 m/s. They are in strong agreement with the predictions of our model considering anomalous acoustic dispersion. A similar phenomenon is also observed in highly nonlinear fiber. Our finding highlights the necessity of considering acoustic material dispersion in such dynamic processes, providing a deeper understanding of acoustic wave behavior during the SBS process in optical fibers. This insight can enhance optical fiber-based applications and contribute to the improved design of integrated photonic platforms.
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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) | 0.000 | 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 it