Stepped-Frequency Microwave Waveform Generation Based on a Fourier Domain Mode-Locked Optoelectronic Oscillator
Bibliographic record
Abstract
We propose and experimentally demonstrate an approach to generating a stepped-frequency microwave waveform (SFMW) with a large time-bandwidth product (TBWP) based on a modified Fourier domain mode-locked optoelectronic oscillator (FDML-OEO). A uniformly stepped-frequency optical carrier is generated by an optical frequency-shifting loop (FSL), which is used as a light source of the FDML-OEO. The joint operation of the stepped-frequency optical carrier generator, a phase modulator (PM), a phase-shifted fiber Bragg grating (PS-FBG), and a photodetector (PD) in the FDML-OEO forms a tunable microwave photonic filter (MPF), with the tuning interval being identical to the step duration of the stepped-frequency optical carrier. When the round-trip time of the OEO is equal to an integer multiple of the tuning interval of the MPF, Fourier domain mode-locking is achieved, and an SFMW is generated. The operation of the proposed SFMW generator is experimentally evaluated. An SFMW with a large TBWP of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$3.25\times 10 ^{5}$ </tex-math></inline-formula> is generated.
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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 | 0.001 | 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 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".