Sub-hertz-linewidth hybrid-integrated laser for isolator-free silicon photonics
Bibliographic record
Abstract
This work presents a hybrid-integrated external-cavity laser with a 0.45 Hz Lorentzian linewidth and exceptional feedback tolerance of up to −8.1dB, enabling isolator-free photonic integrated circuits. Unlike current high-Q locking configurations, our approach leverages a broadband external cavity, effectively mitigating thermorefractive noise and mode-hopping while ensuring stable operation. Through a detailed analysis of noise suppression in low-Q locking configurations, we demonstrate that extending the external cavity to increase the effective photon lifetime achieves noise suppression comparable to high-Q locking. This relaxes the stringent Q-factor requirements for self-injection locking, enabling chip-scale lasers with coherence surpassing bulky fiber lasers while maintaining compatibility with broadband external cavities. The demonstrated ultra-high coherence and strong feedback insensitivity make this laser an ideal candidate for large-scale heterogeneous photonic integration, with transformative applications in optical and quantum computing, precision sensing, and metrology.
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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".