Frequency- and Notch-Depth-Tunable Single-Notch Microwave Photonic Filter
Bibliographic record
Abstract
A single-notch microwave photonic filter with tunable frequency and tunable notch depth is proposed and experimentally demonstrated. In the proposed filter, two phase-modulated optical signals at two different wavelengths are generated at a phase modulator. One phase-modulated signal is filtered by a phase-shifted fiber Bragg grating with an ultra-narrow notch to remove the upper sideband. The other phase-modulated signal is filtered by a wideband optical bandpass filter to remove the lower sideband. Since the remaining lower and upper sidebands in the two optical signals are out of phase, the combination of the beat signals at a photodetector will lead to the cancelation of the detected microwave signals, to generate an ultranarrow notch. An experiment is performed. A single-notch microwave photonic filter with a 3-dB bandwidth of ~180 MHz, a tunable frequency from 1.5 to 6.6 GHz, and a tunable notch depth from 0 to 42 dB is experimentally 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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".