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Mode Couplers and Converters Based on Dual-Core Hollow-Core Photonic Bandgap Fiber
oleh: Simeng Han, Zhi Wang, Yange Liu, Hongye Li, Hu Liang, Zhenhong Wang
Format: | Article |
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Diterbitkan: | IEEE 2018-01-01 |
Deskripsi
We propose mode couplers and converters based on dual-core hollow-core photonic bandgap fiber (HC-PBGF) structures, which might be potential solutions for integrated all-fiber multiplexers or demultiplexers of a mode-division multiplexed (MDM) transmission system using HC-PBGFs. Coupling properties of LP<sub>01</sub> and LP<sub>11</sub> mode in the mode coupler are investigated and applied to mode separators and polarization separators. Mode transition from LP<sub>01</sub> to LP<sub>11</sub> and LP<sub>21</sub> mode are demonstrated in the mode converter whose smaller core is expected as input end and matched with single-mode fiber. The coupling between fundamental mode and high-order modes is accomplished through the resonant effect, which is fulfilled by modifying the structure parameter of the smaller core. Such mode converters based on dual-core HC-PBGF could be a promising substitute for the free-space coupling device, which is costly and not suitable for integration design in MDM systems and other hollow-core fiber experiments and applications.