期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 39, 期 20, 页码 6479-6486出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2021.3101674
关键词
Couplings; Power measurement; Optical fibers; Extraterrestrial measurements; Crosstalk; Optical fiber networks; Optical fiber cables; Impulse response; integral calculation; power coupling coefficient; ring-core fiber (RCF); swept-wavelength interferometry (SWI)
资金
- National Key R&D Program of China [2018YFB1801800]
- NSFC Guangdong joint program [U2001601]
- National Natural Science Foundation of China [61875233]
- Key R&D Program of Guangdong Province [2018B030329001]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01X121]
This paper proposes a modified inter-mode coupling characterization method based on swept-wavelength interferometry measurement to accurately characterize the low inter-mode coupling of weakly-coupled few mode fibers. Experimental results show that the proposed method has feasibility and reliability in measuring low-coupling characteristics between modes.
In this paper, to accurately characterize the low inter-mode coupling of the weakly-coupled few mode fibers (FMFs), we propose a modified inter-mode coupling characterization method based on swept-wavelength interferometry measurement, in which an integral calculation approach is used to eliminate significant sources of error that may lead to underestimation of the power coupling coefficient. Using the proposed characterization method, a low-crosstalk ring-core fiber (RCF) with low mode dependent loss (MDL) and with single span length up to 100 km is experimentally measured to have low power coupling coefficients between high-order orbital angular momentum (OAM) mode groups of below -30 dB/km over C band. The measured low coupling coefficients based on the proposed method are verified by the direct system power measurements, proving the feasibility and reliability of the proposed inter-mode coupling characterization method.
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