COMSOL - Mode Analysis of Optical Fibers

COMSOL – Mode Analysis of Optical Fibers is a complete, hands-on guide to simulating and understanding light propagation in optical fibers using COMSOL Multiphysics.

Designed for students, researchers, and engineers in photonics, this course takes you step-by-step from building simple step-index fibers to advanced microstructured fiber modeling — all within COMSOL’s powerful simulation environment.

You’ll begin with the fundamentals of the COMSOL interface, parameter definition, geometry creation, and meshing. Then, through structured projects, you’ll explore how to model, analyze, and visualize fiber modes, including single-mode, multi-mode, double-cladding, and bent fibers, as well as microstructured photonic crystal fibers.

What You’ll Learn

• Master COMSOL basics - Interface, parameters, geometry, materials, and meshing

• Perform optical mode analysis to find TE and TM modes and compute effective indices

• Visualize vector fields (Ez, Hz, normE, normH) using gradient and contour plots

• Model advanced fiber designs - Double-cladding, bent, and microstructured fibers

• Use PML and Scattering Boundaries (SBC) to analyze guided and leaky modes

• Compute optical properties such as power confinement and overlap factor

• Apply Parametric Sweep to study bending effects and mode variations

• Integrate Python tools (Fiber Parameter Calculator) for analytical fiber calculations

Key Features

• Step-by-step modeling demonstrations in COMSOL Multiphysics

• 15 structured lectures covering basic theory + simulation practice

• Downloadable Python script, parameter file

• Concept-reinforcing quizzes after every lecture

• Clear distinction between guided vs. leaky modes and TE/TM field visualization

• Covers PML vs. SBC boundaries, bending losses, and mode confinement trends

• Designed for beginners to intermediate users in photonics and fiber optics simulation

Projects Covered

1. Project 1: Step-Index Fiber – SMF vs. MMF
   Mode analysis, V-number calculation, and Python-based fiber parameter tool.

2. Project 2: Double-Cladding Fiber
   Power confinement and overlap factor computation.

3. Project 3: Fiber Bending Study
   2D axisymmetric model with parametric sweep for bending radius.

4. Project 4: Microstructured Fibers
   Modeling, mode analysis with PML and SBC, and visualization of leaky modes.

Disclaimer

This course is not affiliated with, endorsed by, or sponsored by COMSOL AB. COMSOL Multiphysics® is a registered trademark of COMSOL AB. All references to COMSOL Multiphysics® software in this course are made solely for educational and instructional purposes. For official COMSOL support, training, or licensing, please visit the official COMSOL website.