Ultrabroadband fiber Bragg gratings written with a highly chirped phase mask and infrared femtosecond pulses
Bibliographic record
Abstract
The writing of ultrabroadband Fiber Bragg Gratings (FBGs) is demonstrated in both hydrogen-free and hydrogen-loaded standard telecom fibers by the use of IR femtosecond pulses and a highly chirped first-order phase-mask. A high reflectivity filter providing a wavelength coverage of five telecom bands (E+S+C+L+U) is demonstrated over a single 35mm long grating inscribed in only 30s in H(2)-loaded SMF-28 fiber. Refractive index modulation of about 2.5x10(-3) and 5x10(-3) are obtained after a few second exposure time in both hydrogen-free and hydrogen-loaded SMF28 fibers. This report paves the way to the development of new broadband fiber-based optical components such as multi-wavelengths filters and sources.
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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) | 0.000 | 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".