Transmission efficiency improvement in microwave fiber-optic link using sub-picometer optic bandpass filter
Why this work is in the frame
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Bibliographic record
Abstract
In a microwave fiber wireless communication system, reducing optical carrier-to-sideband ratio can improve the receiving sensitivity and dynamic range of the system. However, at lower modulation frequencies corresponding to cellular radio (900 MHz), personal communication system (1.8 GHz) and IEEE 802.11g (2.4 GHz), separating the signals from the carrier and reducing carrier power in optic domain is a rather challenging task. In this paper, we have presented a new method to improve the transmission efficiency in microwave fiber-optic link by suppressing the optical carrier using a sub-picometer bandpass filter. The filter we designed and fabricated has a −3dB bandwidth of 120 MHz, capable of even filtering out a microwave signal as low as 900 MHz. We compared the transmission performance between filtered signals and unfiltered signals. The experimental results showed that the receiver sensitivity was improved significantly, 4.4dB for the 900MHz signal, and up to 8.7dB for the 1.8GHz at bit-error-rate of 10<sup>-9</sup>, by optical carrier suppression.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 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