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Writing Bragg Gratings in Multicore Fibers
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High-capacity optical communication relayed by multi-core amplifier on deployed submarine seven-core fiber cable
Yingyu Chen1, Jinkai Zhou2, Yaolin Wu2
1School of Electronics and Information Technology & Guangdong Provincial Key Laboratory of Optoelectronic Information Processing Chips and Systems & Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou, China.
Communications Engineering
|April 10, 2026
Summary
This study validates space division multiplexing (SDM) using multi-core fiber (MCF) submarine cables. A 7-core fiber link achieved a record 410.5 Tbit/s transmission, proving MCF technology
Area of Science:
- Optical Communications
- Telecommunications Engineering
- Materials Science
Background:
- Space division multiplexing (SDM) using multi-core fiber (MCF) is crucial for high-density cabling in constrained environments like submarine systems.
- While lab tests show MCF feasibility, real-world optical communication validation with amplifiers is needed.
Purpose of the Study:
- To conduct a field validation of a multi-core fiber submarine cable communication system.
- To demonstrate the performance of integrated optical amplifiers within an MCF submarine link.
Main Methods:
- Utilized a field-deployed 7-core fiber submarine cable infrastructure.
- Employed matched C+L Band cladding-pumped 7-core multi-core erbium-doped fiber amplifiers (MC-EDFAs).
- Performed end-to-end system communication validation.
Main Results:
- Achieved a record net transmission rate of 410.5 Tbit/s over a 140 km 7-core fiber link.
- MCF showed robustness to deployment and submarine disturbances with minor attenuation and crosstalk variations.
- Developed 7-core MC-EDFAs provided gains above ~18 dB (C Band) and ~21 dB (L Band), compensating for span losses.
Conclusions:
- This field demonstration is a critical step towards commercializing integrated MC-EDFA SDM submarine optical communication systems.
- The results confirm the viability of MCF technology for practical high-capacity submarine applications.
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