Radio over multimode fiber for wireless access
Bibliographic record
Abstract
A radio over fiber link is a promising technology for antenna remoting applications. Typically, the radio over fiber link employs a single mode fiber. However, the signal power at the remote antenna is very small. The main reason is large power loss in the E/O and O/E convertor, but the coupling efficiency of a E/O convertor can be improved with multimode fiber (MMF), so we propose to use a ROF link with a vertical-cavity surface-emitting laser with a graded index MMF to transport optical signals. A multimode fiber has a larger core radius compared to a SMF. A larger core radius allows more optical power coupled into a fiber. With simple butt-coupling techniques, the coupling efficiency can be 90% and simplicity leads to reduction in cost of the link. Normally, the MMF is used in short distance digital applications with a bandwidth distance product of about 500 MHz.km, so it is good for local area picocells. Our approach is to transmit passband signals such as QPSK and FSK through the ROF link. Our simulation shows that a 900 MHz carrier can transport through a link of 1.22 km long. In this paper, we investigate the feasibility of using a MMF for antenna remoting in local area picocells and compare the tradeoff between coupling efficiency and bandwidth.
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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 | 0.000 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.024 | 0.007 |
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".