Mode conversion between fibers with different refraction index distribution based on adiabatically tapered structures

Area of Science:

• Optical Engineering
• Photonics
• Fiber Optics

Background:

• Optical fibers with varying refractive index distributions necessitate mode conversion for practical applications.
• Connecting different fiber types requires understanding mode characteristics and conversion feasibility.

Purpose of the Study:

• To theoretically analyze the feasibility of mode conversion between fibers with dissimilar refractive index profiles.
• To investigate the effectiveness of adiabatically tapered structures for mode conversion.

Main Methods:

• Theoretical analysis of mode conversion using adiabatically tapered structures.
• Investigation of three common tapered structures: tapered core, diffused core, and tapered cladding.
• Evaluation of mode conversion for ring core, convex core, multicore, and single-core fibers.

Main Results:

• Adiabatically tapered structures are not universally suitable for all modes in ring core and convex core fibers.
• Mode conversion is feasible between multicore fiber and single-core fiber using tapered structures.
• The effectiveness of mode conversion depends on the fiber type and the specific tapered structure employed.

Conclusions:

• Adiabatically tapered structures offer a viable method for mode conversion between specific fiber types, notably multicore and single-core fibers.
• The limitations of mode conversion for ring and convex core fibers highlight the need for tailored approaches.
• Further research may explore optimized tapered structures for broader mode conversion applications.