Crosstalk analysis in homogeneous multi-core two-mode fiber under bent condition

Area of Science:

• Optical Fiber Communications
• Photonics
• Waveguide Theory

Background:

• Multi-core two-mode fibers (MC-TMFs) offer increased transmission capacity.
• Understanding inter-core crosstalk is crucial for MC-TMF performance.
• Fiber bending can significantly impact signal integrity in MC-TMFs.

Purpose of the Study:

• To analyze inter-core crosstalk in homogeneous MC-TMFs under bent conditions.
• To investigate the influence of intra-core mode coupling on crosstalk.
• To compare crosstalk behavior for different MC-TMF types and bending radii.

Main Methods:

• Coupled-mode equations were employed for theoretical analysis.
• Simulations were performed for two types of homogeneous MC-TMFs.
• Analysis covered various bending radii and intra-core coupling effects.

Main Results:

• Homo-mode crosstalk (LP(11)) dominates under gentle bending due to larger effective area.
• Tight bending enhances intra-core mode coupling, equalizing crosstalk across modes.
• Reduced bending radius with large propagation constant differences and small core pitch shows similar crosstalk tendencies.

Conclusions:

• Intra-core mode coupling plays a significant role in dictating inter-core crosstalk in bent MC-TMFs.
• Fiber bending conditions critically influence the dominant crosstalk mechanisms.
• MC-TMF design and deployment must consider bending effects for optimal performance.