Photonic generation of linearly chirped microwave waveform with a large time-bandwidth product using a silicon-based on-chip spectral shaper
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Bibliographic record
Abstract
Photonic generation of a linearly chirped microwave waveform with a large time-bandwidth product (TBWP) using a silicon-based on-chip spectral shaper is reported. The on-chip optical spectral shaper has a Mach-Zehnder interferometer (MZI) structure in which two linearly chirped waveguide gratings (LC-WBGs) with opposite chirp rates are incorporated into the two arms. The LC-WBGs are fabricated on two rib waveguides by linearly varying the rib widths along the gratings to generate linear chirps. By controlling the length difference between the two arms in the MZI, the spectral response of the shaper can be controlled to have a symmetrical, linearly increasing or linearly decreasing free spectral range (FSR), which is needed for the generation of a linearly chirped microwave waveform based on spectral-shaping and wavelength-to-time (SS-WTT) mapping. The proposed device is fabricated using a CMOS compatible process with 193-nm deep ultraviolet lithography. The use of the spectral shaper to generate a linearly chirped microwave waveform with a chirp rate of 1.54 GHz/ns and a TBWP of 615 is demonstrated.
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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 | 0.000 | 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) | 0.000 | 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