A coherent microwave photonic link With digital phase noise cancellation
Bibliographic record
Abstract
A coherent microwave photonic (MWP) link with digital phase noise cancellation is proposed and experimentally demonstrated. At the transmitter, the optical carrier is phase modulated by a microwave signal via a polarization modulator (PolM). Then, the phase-modulated optical signal is sent to the coherent receiver over a 25-km single mode fiber (SMF). At the receiver, the phase-modulated optical signal is detected by a polarization- and phase-diversity coherent optical receiver, to generate two signals. The phase noise introduced by both the transmitter laser source and the local oscillator (LO) laser source is converted into an amplitude noise at the output of the coherent receiver. Through multiplying the two signals from the coherent receiver, the phase noise can be completely cancelled. Error-free transmission of a 2.5-Gbps 16 quadrature amplitude modulation (QAM) microwave signal over a 25-km SMF is experimentally demonstrated. The error vector magnitude (EVM) of the recovered signal after the DSP-based phase noise cancellation (PNC) module can reach 6.11%.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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".