A Dual-Polarization Silicon-Photonic Coherent Receiver Front-End Supporting 528 Gb/s/Wavelength
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Bibliographic record
Abstract
Supporting advanced modulation schemes such as 16 quadrature-amplitude modulation (QAM) in a high-speed transimpedance amplifier (TIA) requires minimizing noise and total harmonic distortion (THD) across gain settings and frequency. Accordingly, our automatically reconfigurable TIA reduces base resistor noise, gain peaking, phase margin (PM) degradation, and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$f_{T}$ </tex-math></inline-formula> degradation, operating on a single sense voltage and eliminating the need for multiple control loops. A collaborative offset and dc current cancellation technique is introduced to reduce offset-induced nonlinearity, while protecting the receiver (RX) against current overdrive. A prototype of the RX is fabricated on 130-nm SiGe BiCMOS process and demonstrates a maximum gain of 75.5 dB <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Omega $ </tex-math></inline-formula> with 35.5 dB of dynamic range, 42-GHz bandwidth (BW), and a maximum gain averaged input-referred noise (IRN) of 18.5 pA/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\sqrt {\text {Hz}}$ </tex-math></inline-formula> . The silicon-photonic transceiver assembly incorporating four such RXs achieves 25-dB required optical signal to noise ratio (ROSNR) for received optical power between–22 and 1 dBm at 50 Gbaud, and aggregate data rate of 528 Gb/s/ <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda$ </tex-math></inline-formula> at 66 Gbaud and 25-dB ROSNR.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 it