An Ultra-Wideband Microwave Photonic Phase Shifter With a Full 360$^{\circ}$ Phase Tunable Range
Bibliographic record
Abstract
A novel photonic approach to the implementation of an ultra-wideband microwave phase shifter is proposed and experimentally demonstrated. In the proposed system, a single-sideband (SSB) signal is sent to a polarization-maintaining fiber Bragg grating (PM-FBG), which has two spectrally separated transmission notches along the fast and the slow axes. By locating the optical carrier along the fast axis at the transmission notch, the optical carrier in the SSB signal is removed. At the output of the PM-FBG, two orthogonally polarized optical signals, one with the optical carrier and the sideband, the other with only the sideband, are obtained. The two orthogonal signals are then sent through a variable retardation plate (VRP) to a polarizer and then detected by a photodetector. By controlling the VRP to introduce a tunable phase difference between the two orthogonally polarized SSB signals, a microwave signal with a tunable phase shift is generated. A theoretical analysis is developed, which is validated by an experiment. A microwave phase shifter with a full 360° phase shift over a frequency range from 10 to 40 GHz is demonstrated.
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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 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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".