Abstract
We analyze the inter-core crosstalk in homogeneous multi-core two-mode fibers (MC-TMFs) under bent condition by using the coupled-mode equations. In particular, we investigate the effects of the intra-core mode coupling on the inter-core crosstalk for two different types of MC-TMFs at various bending radii. The results show that the inter-core homo-mode crosstalk of LP(11) mode is dominant under the gentle fiber bending condition due to its large effective area. However, as the fiber bending becomes tight, the intra-core mode coupling is significantly enhanced and consequently makes all the inter-core crosstalk levels comparable to each other regardless of the mode. A similar tendency is observed at a reduced bending radius when the difference in the propagation constants between modes is large and core pitch is small.
Highlights
The space-division-multiplexing (SDM) technology has attracted a great deal of attention as a viable solution to overcome the fundamental capacity limit of the conventional single-mode fiber
For the SDM system utilizing multi-mode fibers (MMFs), it is necessary to compensate for the mode coupling among the spatial modes by utilizing the multiple-input multiple-output (MIMO) processing technique at the coherent receiver
There have been some efforts to scale up the transmission capacity of an optical fiber with a manageable implementation complexity by utilizing multi-core few-mode fibers (MC-FMFs) [3,4,5,6,7]
Summary
The space-division-multiplexing (SDM) technology has attracted a great deal of attention as a viable solution to overcome the fundamental capacity limit of the conventional single-mode fiber. For the SDM system utilizing MMFs, it is necessary to compensate for the mode coupling among the spatial modes by utilizing the multiple-input multiple-output (MIMO) processing technique at the coherent receiver. It is difficult to utilize a large number of spatial modes in the MMF-based SDM system due to the increased complexity of the coherent receiver. There have been some efforts to scale up the transmission capacity of an optical fiber with a manageable implementation complexity by utilizing multi-core few-mode fibers (MC-FMFs) [3,4,5,6,7]. We analyze the crosstalk occurring in two different types of multi-core two-mode fibers (MC-TMFs) by using the coupled-mode equations. We investigate the accumulation of the inter-core crosstalk occurring in these MC-TMFs for various transmission distances
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