Investigating Power Multiplexing for Coherent Microwave Photonic Links
Bibliographic record
Abstract
We propose a new technique to use power multiplexing in a coherent radio-over-fiber (RoF) link to increase the data rate without using additional optical wavelengths. At the transmitter, a continuous-wave (CW) light wave from a laser diode (LD) is modulated by two pairs of power-multiplexed microwave vector signals using a dual-drive Mach-Zehnder modulator (DD-MZM). The optical signal at the output of the DD-MZM is transmitted over a single-mode fiber (SMF) to a coherent receiver, where coherent detection is performed. A digital signal processing (DSP) algorithm is developed to mitigate the phase noise and unstable offset frequency between the transmitter and local oscillator light sources and to de-multiplex the power-multiplexed signals. An experiment is performed. For the transmission of four power-multiplexed vector signals over 10 km of SMF with two 16QAM lower-power signals and two QPSK higher-power signals, all at a carrier frequency of 4 GHz and a baud rate of 0.5 GSym/s, 3.7% error vector magnitudes (EVMs) for the 16QAM signals and 2.5% for the QPSK signals are achieved for a received optical power of -1 dBm. Error-free transmission is achieved.
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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 | 0.000 | 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 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".