Optical phase and amplitude control for beamforming with multiwavelength Gires-Tournois Bragg grating cavities
Bibliographic record
Abstract
We present a novel optical beamformer based on Gires-Tournois fibre Bragg grating coupled cavities (GT-BF). This beamformer allows for independent control of both amplitude and phase of each antenna in an 8 elements array. It is designed to be used in radio-over-fibre (ROF) dense wavelength division multiplexed antenna remoting links with 25 GHz wavelength spacing, and allows for remote centralized array control. The GT-BF is optimized for 802.11a/g/n 5GHz signals with 20 MHz bandwidth, but we explore its performances up to 100 Mhz bandwidth. This is not a true time delay beamformer so the bandwidth is limited by the beam squint effect. The GT-BF is designed for the double sideband (DSB) optical modulation format, which is simple and allow for the use of low cost modulators. Finally, this beamformer can compensate for dispersion of the ROF link, which otherwise would cause DSB signal attenuation. The GT-BF is controlled by stretching or by adjusting the temperature of the Gires-Tournois fibre Bragg grating coupled cavities. The former method allows for faster adjustment of the array radiation diagram.
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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) | 0.002 | 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".