Frequency- and Notch-Depth-Tunable Single-Notch Microwave Photonic Filter
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
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.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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