Zhang Lianzhen, Zhang Xuedian, Liu Xuejing, Zhou Jun, Yang Na, Du Jia, Ding Xin
Key Laboratory of Optical Technology and Instrument for Medicine, Ministry of Education, University of Shanghai for Science and Technology, Shanghai 200093, China.
Nanomaterials (Basel). 2021 Nov 30;11(12):3256. doi: 10.3390/nano11123256.
The combination of mode division multiplexing (MDM) based on orbital angular momentum (OAM) modes with wavelength division multiplexing (WDM) has attracted considerable attention due to its ability to increase optical transmission capacity. However, the switching of the multi-wavelength and multi-order OAM mode in an all-fiber structure has always been a challenge. As a solution, a thermally tunable dual-core photonic crystal fiber (DC-PCF) is proposed to achieve multi-order and multi-wavelength switching of the OAM mode. The results show that the OAM mode with topological charge m = ±1 can be excited with the linear polarization fundamental mode (LPFM) and circular polarization fundamental mode (CPFM). In addition, the device can effectively excite a high-purity ±1st order OAM mode with wavelengths ranging from 1520 to 1575 nm by thermal tuning. The purity of the mode is in excess of 99%, and the energy conversion efficiency (ECE) is above 95%. The proposed design is expected to be applied in all-fiber communication systems combined with MDM and WDM.
基于轨道角动量（OAM）模式的模式分割复用（MDM）与波分复用（WDM）相结合，因其能够提高光传输容量而备受关注。然而，在全光纤结构中实现多波长和多阶OAM模式的切换一直是一个挑战。作为一种解决方案，提出了一种热可调谐双芯光子晶体光纤（DC-PCF）来实现OAM模式的多阶和多波长切换。结果表明，拓扑电荷m = ±1的OAM模式可以由线偏振基模（LPFM）和圆偏振基模（CPFM）激发。此外，该器件通过热调谐能够有效地激发波长范围为1520至1575 nm的高纯度±1阶OAM模式。模式纯度超过99%，能量转换效率（ECE）高于95%。所提出的设计有望应用于结合MDM和WDM的全光纤通信系统。
