Transmission uniformity of diffractive parallel optical interconnect relays: a numerical analysis based on rigorous coupled wave theory
Bibliographic record
Abstract
Free-space optical interconnects have been proposed as a possible solution to the interconnection bottleneck in high performance electronic systems at the board-to-board and chip-to-chip level. The optical design is shown of a VCSEL-based bi-directional optical interconnect system that has recently been implemented This clustered optical system transmits 256 channels in each direction and is based on a diffractive double minilens relay. The relay lenses have a square aperture of 750 /spl mu/m, a focal length of 8.5 mm, 256 phase levels and operate at a wavelength of 850 nm. Each lens relays a 4 /spl times/ 4 spot array on a 125 /spl mu/m pitch. This system was originally designed using scalar diffraction theory and so it was assumed that the diffraction efficiency is a function only of the number of phase levels in the lenses and is thus identical for all beams in the array. However since each beam within the 4 /spl times/ 4 array passes through a different set of zones in the lenses and since the outer zones of the lenses have smaller local periods than the central zones the diffraction efficiency experienced by each beam will not be identical, leading to transmission non-uniformity. In this paper we will apply rigorous coupled wave analysis (RCWA) to this optical system design in order to accurately determine the efficiency of the minilens as a function of the zone radius and hence calculate the variation in transmission efficiency that will result. We will also extend this analysis to faster diffractive optical systems (f/3.7) that relay larger (16 /spl times/ 16) spot arrays and investigate polarization dependence.
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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 | 0.001 | 0.003 |
| 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 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 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".