Story perspectives

Breakthrough Cryogenic Modulator Achieves 10.35 Gb/s Switching

10/23/2025

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Summary

Story summary

Researchers demonstrated a cryogenic optical modulator based on a micro-ring resonator with a phase-change material (GST) achieving 10.35 Gb/s modulation and resonance tuning via non-volatile GST switching.
Despite slight degradation after cooling cycles, the device remains a binary switch and maintains a Q-factor.
The study also demonstrated multilevel switching, which enhances resonance tuning capabilities.
Future work may significantly improve modulation efficiency by leveraging highly doped PN junctions in silicon photonics.

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Story summary

Researchers demonstrated a cryogenic optical modulator based on a micro-ring resonator with a phase-change material (GST) achieving 10.35 Gb/s modulation and resonance tuning via non-volatile GST switching.
Despite slight degradation after cooling cycles, the device remains a binary switch and maintains a Q-factor.
The study also demonstrated multilevel switching, which enhances resonance tuning capabilities.
Future work may significantly improve modulation efficiency by leveraging highly doped PN junctions in silicon photonics.