期刊
OPTICS EXPRESS
卷 27, 期 26, 页码 38049-38060出版社
Optica Publishing Group
DOI: 10.1364/OE.27.038049
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资金
- National Key RAMP
- D Program of China [2018YFB1801803]
- National Natural Science Foundation of China [61761130082, 11574001, 11774116]
- Royal Society-Newton Advanced Fellowship
- National Program for Support of Top-notch Young Professionals
- Yangtze River Excellent Young Scholars Program
- Natural Science Foundation of Hubei Province [2018CFA048]
- Key RAMP
- D Program of Guangdong Province [2018B030325002]
- Open Fund of IPOC Beijing University of Posts and Telecommunications [IPOC2018A002]
- Program for Huazhong University of Science and Technology Academic Frontier Youth Team [2016QYTD05]
- Fundamental Research Funds for the Central Universities [2019kfyRCPY037]
We present a low-loss weakly guiding ring-core fiber for orbital angular momentum (OAM) mode group multiplexing (MGM) transmission. This special fiber design supports 50 radially fundamental modes divided into 13 mode groups with only 0.7% relative refractive index difference between the fiber ring core and cladding. Except the first two groups with 10(-5) mode spacing, the other mode groups are separated with each other with effective refractive index difference (Delta n(eff)) larger than 10(-4), indicating relatively low-level inter-group crosstalk. One can directly use different OAM mode groups for MGM communications without multiple-input multiple-output digital signal processing (MIMO-DSP) technique. Besides, one can employ different OAM modes among the same mode group to carry different data information assisted by small-scale MIMO technique. The target fiber exhibits small and flat dispersion within (14.3, 39.7) ps/nm/km which is comparable to that in the standard single-mode fiber (SMF), and extremely large mode area within (787.9, 841.2) mu m(2) over the whole C + L band. MIMO equalization complexities for modified small-scale MIMO-DSP assisted intra-group modes multiplexing combined with MIMO-free inter-group modes multiplexing method in both time and frequency domain are much simpler compared to traditional 50x50 MIMO equalization.
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