Novel large cross-section single-mode AlGaAs/GaAs asymmetric optical switch based on carrier injection effect
Bibliographic record
Abstract
A novel AlGaAs/GaAs asymmetric Y-junction optical switch, with 1.7um-thick core layer for single-mode operation at 1.55um, has been designed and fabricated. The switch is based on total internal reflection (TIR) from a carrier-induced index barrier. At the TIR interface inside the Y-junction, a small tapered gap is introduced to obtain a sharp carrier gradient profile for improved switching efficiency. A double masking technique, suitable for monolithic circuit integration, is used to achieve a nearly perfect gap vertex. The switch's strip-loaded waveguide design has a five-layer-heterostructure with a W-shaped index profile, and can provide high coupling efficiency to a single-mode fiber. We have obtained a low optical loss of 1.0dB/cm on 5um-wide waveguides. The asymmetric Y-junction design is carried out by simulating two-dimensional carrier-induced index change based on the calculated carrier concentration and self-heating temperature profile using finite element method (FEM). Preliminary experimental results indicate that optical switches with small size, low loss, fast switching speed and high extinction ratio can be obtained. Switching times of a few nanoseconds have been obtained.
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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 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 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".