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Updated: May 5, 2026

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Quasi-light Storage for Optical Data Packets
Published on: February 6, 2014
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101.47-b/s/Hz spectral efficiency transmission using probabilistic shaping 16-QAM in 7-core 3-mode fiber
Optics Express
|February 20, 2026
Summary
This study demonstrates a novel 7-core, 3-mode optical fiber system using probabilistic shaping 16-quadrature amplitude modulation (PS-16QAM) to boost data capacity. The system achieved high spectral efficiency, paving the way for next-generation ultra-high-capacity optical communications.
Area of Science:
- Optical Communications
- Information Theory
- Materials Science
Background:
- Global data traffic growth strains conventional single-mode fiber systems, nearing the Shannon limit.
- Future communication demands necessitate breakthroughs beyond current optical fiber capacities.
Purpose of the Study:
- To experimentally demonstrate a multi-core, few-mode fiber system utilizing probabilistic shaping for enhanced capacity.
- To validate the integration of advanced modulation and multiplexing techniques for ultra-high-speed data transmission.
Main Methods:
- Employed probabilistic shaping 16-quadrature amplitude modulation (PS-16QAM) with Maxwell-Boltzmann distribution for optimized energy allocation.
- Utilized a 7-core, 3-mode fiber with graded-index profile and trench-assisted structure to minimize inter-core crosstalk.
- Integrated wavelength division multiplexing (WDM), polarization division multiplexing (PDM), and space division multiplexing (SDM) for parallel transmission.
Main Results:
- Achieved parallel transmission of 126 channels over an 80.6-km link with differential group delay compensation.
- Implemented advanced algorithms for frequency offset estimation, synchronization, and MIMO-LMS equalization with maximum likelihood phase recovery.
- Attained a maximum spectral efficiency of 101.47 b/s/Hz under a 25.5% soft-decision forward error correction (FEC) threshold.
Conclusions:
- Validated the effectiveness of probabilistic shaping in multi-core, few-mode fiber systems.
- Demonstrated a feasible pathway towards next-generation ultra-high-capacity optical communication systems.
- Provided critical technical support for advancing future optical network infrastructure.
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