201.6-Bit/s/Hz Spectral-Efficiency Transmission Over a 180-μm Cladding-Diameter Seven Ring Core Fiber Using Low-Complexity 4×4 MIMO Equalization

Space-division multiplexing (SDM) has been widely studied to increase the per-fiber capacity/spectral efficiency (SE) and break the nonlinear Shannon limit of the single-mode fiber (SMF). In spite of the achieved dramatic progress, the high SE of reported SDM systems is realized generally at the cos...

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Published inJournal of lightwave technology Vol. 42; no. 4; pp. 1296 - 1303
Main Authors Liu, Junyi, Xu, Zengquan, Liu, Jie, Lin, Zhenrui, Zhang, Junwei, Li, Zhenhua, Zhang, Jingxing, Shen, Lei, Yu, Siyuan
Format Journal Article
LanguageEnglish
Published New York IEEE 15.02.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Angular momentum
Bit error rate
Channels
Cladding
Claddings
Complexity
Diameters
Efficiency
Equalization
Error correction
Fiber-optic communications
high spectral efficiency
MIMO communication
Multiplexing
Optical fiber communication
Optical fiber devices
Optical fiber polarization
Optical transmitters
orbital angular momentum
Quadratures
ring-core fiber
space-division multiplexing
Wavelength division multiplexing
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Summary:Space-division multiplexing (SDM) has been widely studied to increase the per-fiber capacity/spectral efficiency (SE) and break the nonlinear Shannon limit of the single-mode fiber (SMF). In spite of the achieved dramatic progress, the high SE of reported SDM systems is realized generally at the cost of a large fiber cladding diameter or high-complexity multiple-input multiple-output (MIMO) processing. In this paper, SDM transmission with a net spectral efficiency over 200 bit/s/Hz is experimentally demonstrated utilizing a low-complexity modular MIMO equalization with a dimension of 4×4 and a time-domain length of 15. A 14-km seven ring-core fiber (SRCF) is employed in the SDM systems, supporting 84 orbital angular momentum (OAM) mode channels (7 cores × 6 OAM modes × 2 polarizations) within a cladding diameter of 180 μm, each of which carries 40 wavelengths. With a 12-Gbaud 8-quadrature amplitude modulated (8QAM) signal carried in each data channel, a raw (net) SE of 241.92 (201.6) bit/s/Hz and capacity of 120.96 (100.8) Tbit/s can be achieved, where the bit-error rate (BER) of all channels is below the 20% soft-decision forward error correction (FEC) threshold of 2.4×10 −2 .
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2024.3350655