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Updated: Jun 11, 2025

Writing Bragg Gratings in Multicore Fibers
Published on: April 20, 2016
Inter-Mode Crosstalk Estimation between Cores for LP Modes in Weakly Coupled Few-Mode Multicore Fiber with
Shuangmeng Liu1, Lian Xiang1,2
1School of Electronic and Information Engineering, Soochow University, Suzhou 215006, China.
Abstract:
A novel inter-mode crosstalk (IMXT) model of LPmn mode for weakly coupled few-mode multicore fiber is proposed based on the coupled mode theory (CMT) with bending and twisting perturbations. A universal expression of the mode coupling coefficient (MCC) between LPmn modes is derived. By employing this MCC, the universal semi-analytical model (USAM) of inter-core crosstalk (ICXT) can be applied to calculate the IMXT. Simulation results show that our model is generally consistent with previous theories when stochastic perturbations are absent. Moreover, our model can work effectively when stochastic perturbations are present, where former theories are not able to work properly. It has been theoretically found that the MCC has an intimate relationship with core pitch. Our model, based on the CMT, can provide physical characteristics in detail, which has not been reported clearly by former theories. In addition, our model is applicable to phase-matching and non-phase-matching regions of both real homogeneous and heterogeneous few-mode multicore fibers (FM-MCFs) with a wider range of applications.
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