Hybrid numerical technique combining the finite-difference beam-propagation method and the finite-difference...

Area of Science:

• Optics and Photonics
• Computational Electromagnetics

Background:

• Optical fibers are essential components in modern communication and sensing technologies.
• Accurate simulation of light propagation in optical fibers, especially those with complex structures like lenses, is critical for device optimization.

Purpose of the Study:

• To propose and validate a new numerical technique for simulating electromagnetic wave propagation.
• To investigate the influence of a lens on the light field within a coreless fiber and its far-field characteristics.

Main Methods:

• A hybrid simulation approach combining the scalar wide-angle finite-difference beam-propagation method (FD-BPM) and the scalar finite-difference time-domain (FD-TD) method.
• Implementation of the technique in cylindrical coordinates for efficient modeling of fiber structures.
• Simulation of the propagating optical field within a lensed coreless fiber.

Main Results:

• The study successfully simulated the light propagation dynamics in a lensed coreless fiber.
• The effect of the integrated lens on the generated far-field pattern was quantitatively evaluated.
• The proposed hybrid method demonstrated its capability for analyzing complex optical fiber scenarios.

Conclusions:

• The combined FD-BPM and FD-TD method provides an effective tool for simulating light propagation in optical fibers with integrated lenses.
• Understanding the lens's impact on the far-field pattern is vital for designing and improving fiber optic components and systems.