Dynamic-Range Enhancement for a Microwave Photonic Link Based on a Polarization Modulator
Bibliographic record
Abstract
A microwave photonic link (MPL) with an increased spurious-free dynamic range (SFDR) using a polarization modulator is proposed and experimentally demonstrated. The fundamental concept of the proposed approach to increase the SFDR is to reduce the third-order intermodulation distortion (IMD3) and to improve the modulation efficiency by partial carrier suppression, which is realized here by producing two channels of intensity-modulated signals with one having only the upper sidebands and the other having the optical carrier that is partially suppressed and the upper sidebands using two optical filters. If the optical powers into the two channels are kept identical, the combination of the two signals at a photodetector will fully cancel the IMD3 terms. In addition, the modulation efficiency is optimized due to the partial carrier suppression, which also leads to an increased SFDR. The proposed MPL is theoretically studied and experimentally demonstrated. An SFDR of 123.48 dB·Hz2/3at a noise floor of -166 dBm/Hz is achieved, which is 15 dB higher than that of a regular intensity-modulation and direct-detection MPL.
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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 | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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".