摘要
We experimentally demonstrate mode-division multiplexed(MDM)transmission using eight orbital angular momentum(OAM)modes over a single span of 100-km low-attenuation and low-crosstalk ring-core fiber(RCF).Each OAM mode channel carries 10 wavelength-division multiplexing(WDM)signal channels in the C band,with each WDM channel in turn transmitting 16-GBaud quadrature phase-shift keying signal.An aggregate capacity of 2.56 Tbit/s and an overall spectral efficiency of 10.24 bit/(s·Hz)are realized.The capacity-distance product of 256(Tbit/s)·km is the largest reported so far for OAM fiber communications systems to the best of our knowledge.Exploiting the low crosstalk between the OAM mode groups in the RCF,the scheme only requires the use of modular 4×4 multiple-input multiple-output processing,and it can therefore be scaled up in the number of MDM channels without increasing the complexity of signal processing.
基金
National Key Research and Development Program of China(2018YFB1801800,2019YFA0706300)
NSFC-Guangdong Joint Program(U1701661)
National Natural Science Foundation of China(61875233)
Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(2017BT01X121)
Guangdong Natural Science Foundation(2016A030313289)
Open Projects Foundation of State Key Laboratory of Optical Fiber and Cable Manufacture Technology(YOFC)(SKLD1806)。
