Abstract
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.
Highlights
In 1992, Allen first discovered the orbital angular momentum (OAM) of light [1], and a large number of applied studies on OAM continued to deepen and expand our understanding of this topic [2,3,4,5]
We propose an OAM mode generator based on asymmetric dual-core
The results indicate that the input of linear polarization fundamental mode (LPFM) or circular polarization fundamental mode (CPFM) has little effect on the coupling efficiency and purity, the LPFM
Summary
In 1992, Allen first discovered the orbital angular momentum (OAM) of light [1], and a large number of applied studies on OAM continued to deepen and expand our understanding of this topic [2,3,4,5]. In 2013, Bozinovic was the first to verify that OAM mode multiplexing can be used for information transmission [11]. This provides a new solution for solving the capacity shortage crisis in optical fiber communication systems. The use of OAM mode multiplexing technology continues to enhance the capacity of optical fiber communication, and the transmission distance continues to increase. The communication distance has reached 100 km without optical amplification and the communication capacity has increased to 256 (Tbit/s)·km [12]
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