Fiber Bragg gratings

In this topic, we demonstrate how to simulate fiber Bragg grating (FBGs) using MODE’ eigenmode expansion (EME) solver. Simulation setup The FBG is constructed with an effective index of 1.5, and a periodic variation of 1e-3 in the refractive index of the core of a step index fiber.  The refractive Więcej…

Chirally coupled core fiber

Conventional fibers are known to be great light guides that can provide almost lossless transmissions for long distance propagation. However, these fibers are usually not flexible to control the fiber modal properties other than customizing the light confinement. Research work has demonstrated that some fiber modal properties of an optical Więcej…

Modes of a Bragg fiber

This example file shows how to setup and calculate the modes of a simple Bragg fiber. Simulation setup Ring structures are used to create the layers with alternating indices. Two dielectric materials have been created, one for the high index layers and another for the low index layers. These materials Więcej…

Step-index and graded-index fiber (FDE)

This topic compares analytical solutions and results simulated with the FDE solver for step-index and graded-index optical fibers. Simulation setup The figure above shows the step-index (left) and graded-index (right) fiber geometries and index profiles. The step-index fiber was tested at a wavelength of 1.55 µm, while the graded-index fiber Więcej…

SMF-28 fiber mode calculation

In this example, we study a simple Corning® SMF-28 fiber.   First, we run the eigensolver at 1.55um to obtain the mode profile. The first mode is obviously the fundamental mode.   Notice that we have used symmetry boundary conditions in the X and Y directions.  Without using symmetry BC’s, Więcej…

Graded-index fiber with FEEM

This example shows how to use the FEEM to calculate the characteristic modes of a graded-index fiber. A spatially varying refractive index profile is generated using the (n, k) material attribute tool. The field distributions and effective indices of the lower order modes are calculated and compared with analytical results. Więcej…