A passively heat-sunk 6-W 1064-nm linearly-polarized fiber amplifier with a 100 ˚C operational temperature range for LEO satellite optical communications
Bibliographic record
Abstract
A 6 W fiber optic amplifier at 1064 nm has been designed for LEO satellites. The amplifier is passively cooled and operational for a heat sink plate temperature from -35˚C to +65˚C. It is polarization-maintaining and is designed for a 2.7 Gbps phase-modulated single-frequency (10 kHz) signal at 1064 nm with an input power between 1 and 20 mW. The unit has a set of redundant pump laser diodes and redundant photodiodes (PD) as well as redundant inputs ports but does not contain any electronics and power supply which are provided externally. A qualification module was tested from -35˚C to +65˚C and when though, vibration and shock, and electro-magnetic testing. The unit showed good performance except for the extreme temperatures where the maximum power output of 6 W was not achieved because of the specified current limit. An increase in the current of 4% at +65˚C and 17% at -35˚C was required to reach 6W. The operational 5W specification was achieved at all temperatures. Furthermore, the module was submitted to a 25 krad accelerated non-operational radiation test to measure the effect of photodarkening. A post radiation photobleaching was performed to better estimate the degradation in space during operations. The experimentally estimated loss from the predicted 8 krad exposition during the lifetime of the units is 3%. Four flight modules were built and tested in the operational temperature range of between -30 ˚C and +60˚C as well as in vibration.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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".