Real-time fiber sensing over 4,400 km subsea cable: dual OFDR fused via RDMA
jwt0625 · x · 2026-11-16
Nokia Bell Labs researchers led by Mikael Mazur demonstrate the first real-time, network-integrated bidirectional fiber sensing over a commercial subsea cable.
- Two OFDR instruments (Hawaii and California) each stream 80 Gbit/s of raw sensor data via RDMA over RoCEv2 onto 100 Gbit/s Ethernet, carried live in a 130 Gbaud, 400 Gbit/s coherent channel (Nokia PSE-6) on the same 4,400 km cable
- A GPU edge server fuses both directions in real time, compressing the >160 Gbit/s combined stream by >100x to reach 10 m resolution — over 200,000 sensor points, doubling their previous demo
- Coherent full-waveform processing generates multiple gauge lengths and sampling spacings in parallel, capturing weak seismic events alongside strong-motion signals without clipping — key for earthquake early warning
The author notes the sensing industry remains primitive at orchestrating sensor clusters, and hopes coherent-lite tech reaches datacenters to enable DAS inside them.
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