Adiabatic Coupler With Nonlinearly Tapered Mode-Evolution Region
Bibliographic record
Abstract
In this work, we propose a time-efficient method to analyze and design the adiabatic couplers (ACs) on the silicon-on-insulator platform. By analyzing the mode-evolution region of ACs, we derive the boundary conditions and necessary constraints on the tapering functions to achieve optimized performance. Taking these conditions into consideration, we choose three common types of functions for the mode-evolution region. Based on the width and separation of the constituent waveguide pair, the performance of ACs with different tapering functions is compared. The compared ACs were fabricated and measured. The splitting ratios (SRs) of the fabricated devices are characterized using unbalanced Mach-Zehnder interferometers. We analytically and experimentally prove that, for a designed 3-dB AC, a quadratic separation and exponentially varying width provides the least SR imbalance with the smallest footprint among the compared tapering methods. The extracted SRs of the designed 3-dB AC using such tapering method are between 47%/53% from 1500 nm to 1600 nm with a mode evolution length of 110 μm. Using this tapering method, we also experimentally demonstrate imbalanced ACs with SRs of 8%/92%, 12%/88%, 15%/85%, 23%/77%, 30%/70%, and 42%/58% measured at 1550 nm.
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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 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".