The stepindex profile corresponds to a powerlaw index profile with the profile parameter approaching infinity. Wave optics software for analyzing micro and nanooptical. Comsol access comsol multiphysics modeling software. Driving illumination function is modified lg mode that approximates a perfect charge 1 vortex matched to this fiber diameter. Supercontinuum generation by intermodal fourwave mixing. Investigating the performance of apodized fiber bragg. Single mode optical fiber smf and multimode optical fiber mmf intensity distributions were presented in 2d design. Multiphysics software models multimaterial optical fibers. How to simulate a mmf fiber in comsol multiphysics. Comsol multiphysics is a crossplatform finite element analysis, solver and multiphysics simulation software. The mode properties are determined by the refractive index profile of the fiber. Em mode analysis for the circular waveguide comsol.
The insets show the electric field amplitudes of the spatial lp modes. The combination of comsol products required to model your application depends on several factors and may include. Semiconductor step index fibers consisting of silicon or germanium core silica cladding have been simulated using comsol software as shown in figure 1. Most electromagnetic components, devices, and products are affected by another branch of physics, whether it be heat transfer, structural mechanics, or. Adding and customizing expressions in the physics interfaces allows for freely coupling them with each. Effective index as a function of the optical wavelength for five main spatial lp modes. The first part of the application computes the modes for a straight step index fiber made of silica glass. It is difficult to find the zero for curves of this type.
The main purpose of this numerical simulation was to obtain insights on the performance of the optical fibre. A new type of fiber acoustooptic device, based on tapered singlemode fiber, is described. For every different value of radius of its core, a range of wavelength, the effective propagating mode area, and the effective. Periodically poled lithium niobate waveguides for quantum. Mar 22, 20 2 responses to modal analysis of stepindex single mode fiber optic using comsol multiphysics 4. How to calculate sbs gain for a step index fibre using comsol. If that is your case, you may put the pmls over the cladding that means the real part of the pmls refractive index shall be that of the silica. By the end you will be well on your way to reaping all. The cad import module addon to comsol multiphysics has two basic functions for assisting your modeling workflow. A simulation was performed using the modal analysis in the electromagnetic wave frequency domain in comsol. Most electromagnetic components, devices, and products are affected by another branch of physics, whether it be heat transfer, structural mechanics, or acoustics, to name a few. Fiber optics revolutionized communication with more applications to come. Akhilesh, in a conventional step index fiber the modes inside the core are so confined that air has a negligible role in the simulations. The rf module optics and photonics in comsol was used to investigate the influence of core radius of the fibre on the effective refractive index, the electric and magnetic field intensities.
Stepindex fiber comsol multiphysics modeling software. Pdf design and simulation of fiber bragg grating by comsol. Semiconductor step index fibers consisting of silicon or germanium core silica cladding have been simulated using comsol software as. The stepindex profile can be used for both singlemode and. Apodization is a process of tapering the strength of the grating at either end so that the apparent refractive index change is gradual rather than abrupt such that. The inner core is made of pure silica glass with refractive index n 1 1. Stepindex fiber simulation comsol blog comsol multiphysics. A stepindex fiber is an optical fiber with a stepindex profile. How to design graded index fiber profile in comsol ndn hub. The informative charts give you an idea of comsols capability by associated files, functions, and builtin options. In the second part, a step index fiber bend with a 3 mm radius of curvature is analyzed with respect to propagating modes and radiation loss. Cad import module import cad files into the comsol software. You can find the number of modes that can be propagated with the lowest attenuation in any type of structure. The comsol multiphysics software offers this level of flexibility with its builtin equation interpreter that can interpret expressions, equations, and other mathematical descriptions on the fly before it generates the numerical model.
Comsol access is a service we provide to our users and prospects. The structure designed in fimmprop is shown below, as well as the modes of the fibre. Analysis of single mode step index fibres using finite. I am a complete newbie to comsol multiphysics, but i have to study and simulate the effects of temperature on multimode optical fibers mmf using comsol multiphysics for my bachelors thesis. Fiber optic based pressure sensor using comsol multiphysics. Rp photonics encyclopedia fiber simulation software. This model is an example of a single step index waveguide made of silica glass. If two fibers with different effective mode areas are spliced together, this will lead to some optical power loss. On effective refractive index the first step is it is assumed that the pcf s are made of silica of background refractive index 1. Unlike earlier designs, the overlap between the acoustic and optical waves is complete, so very little. International journal of science and research ijsr is published as a monthly journal with 12 issues per year. Properties of interest can be, for example, the shapes of the amplitude or intensity distribution of modes. The effective index can be controlled with the size of air holes in the first ring of a fiber. These values are valid for freespace wavelengths of 1.
Study of bending losses in optical fibers using comsol. The oam transmission fiber based on stepindex and gradedindex. The mathematical modeling of the stepindex optical fiber was performed in the comsol multiphysics software. Fiber bragg grating model simulation with fimmprop software. The step index profile corresponds to a powerlaw index profile with the profile parameter approaching infinity. With more than 30 addon products to choose from, you can further expand the simulation platform with dedicated physics interfaces and tools for. Design and simulation of fiber bragg grating by comsol. All of the features listed below are implemented through associated physics interfaces.
In what follows, we design a step index mo fiber capable of supporting multiple lp mgs, and calculate the intramg mo coupling coefficients, by comparison with the simulated data obtained by comsol software. Oct 14, 2017 blog step index fiber simulation knowledge base running parametric sweeps, batch sweeps, and cluster sweeps from the command line blog top papers and posters from the comsol conference 2017 rotterdam. The transmission speed of optical waveguides is superior to microwave waveguides, because optical devices. Comsol multiphysics is compatible with windows xp7810 environment, 32 and 64bit versions. It allows conventional physicsbased user interfaces and coupled systems of partial differential equations pdes. The optical fiber design is simulated to produce multi. By submitting this form you agree to have your information shared with, and be contacted by, addlink software cientifico.
In addition to using multiphysics modeling for your own projects, you can also turn your models into simulation applications and digital twins for use by other design teams. When defining and solving these problems, the fluid is modeled as incompressible by default but can. Design and characterization study of endless single mode esm. The step index profile is used in most singlemode fibers and some multimode fibers. For a comprehensive analysis, use the comsol multiphysics software and the acdc module to see how multiple physics affect your design. Comsol provides an ide and unified workflow for electrical, mechanical, fluid, acoustics and chemical applications. Rp photonics encyclopedia effective mode area, fiber, waveguide. For an optical fiber, a stepindex profile is a refractive index profile characterized by a uniform refractive index within the core and a sharp decrease in refractive index at the corecladding interface so that the cladding is of a lower refractive index. First, for importing geometries created in cad software, the cad import module supports the import of a variety of different file formats, including the parasolid and acis formats, standard formats like step and iges, and native file formats of various cad systems. The stepindex fiber has a high refractive index ring which.
After a general introduction to the user interface, several tutorials will take you step by step through sample models that highlight important features. Oct 27, 2017 comsol multiphysics software video for single mode fiber, creating by kangkan vokto from electronics and communication engineering ece discipline of khulna university in bangladesh. The most popular versions among comsol multiphysics users are 4. Easily couple different physical effects in one analysis with the comsol multiphysics software and the wave optics module. Comsol multiphysics software video for single mode fiber. Many wave optics applications involve multiple physics, including heat transfer in laser heating, structural mechanics in stress optics, and semiconductor lasers, to name a few. Results for effective index, effective area, nonlinear coefficient and the dispersion are presented. Using high pressure chemical vapor deposition to make. As an example, figure 7 shows how the optical spectrum of the output pulse of a similaritontype modelocked fiber laser converges to a nearly rectangular shape within 100 resonator roundtrips. Due to the strain variations we can calculate the change in length of fiber. Supercontinuum generation by intermodal fourwave mixing in a. This software was originally produced by comsol ab. With comsol multiphysics, you will be able to account for coupled or multiphysics phenomena. I am construing an optical fiber like step index fiber in comsol.
Fem based commercial comsol software and shown in fig. Mode analysis of different step index optical fibers at. If you do not yet have a comsol access account, please create one now. The sidelobes of the fbg may be removed by apodizing the grating. This model is an example of a single stepindex waveguide made of silica glass. Intensity distributions of linearly polarized modes 12. Wave optics module application gallery examples comsol. How to calculate sbs gain for a step index fibre using comsol multiphysics. In this paper, we demonstrate the use of the commercial fem software, comsol, in studying the behaviour of single mode step index fibres. Multiphysics software models multimaterial optical. Notably, it is a referred, highly indexed, online international journal with high impact factor. Cfd software for simulating fluid flow applications. I am construing an optical fiber like stepindex fiber in comsol. In this research, new software comsol multiphysics v.
The fiber mode can be taken as a gaussian, so that the coupling efficiency as a function of vertical offset, y0, can be calculated as. This structure was solved in cylindrical coordinates using the fdm fibre solver. Then, a 3d model of fbg was built on smf with the same parameters of core and clad radius. The application gallery features comsol multiphysics tutorial and demo. How to design a rectangular stepindex optical fiber using comsol. I am looking for a free not only as in freedom alternative to comsol multiphysics. However, our main objective is to simulate and design graded.
As fimmprop is a frequencydomain tool, the wavelength was varied using the fimmprop scanner, an automated tool allowing to perform parametric scans. The design and physically analysis of optical fiber was performed using the comsol multiphysics software package v. Aug, 2018 in this video, we will learn how to perform the mode analysis. Comsol multiphysics software understand, predict, and optimize. Comsol multiphysics is a generalpurpose software platform, based on advanced numerical methods, for modeling and simulating physicsbased problems. Design and characterization study of endless single mode. Note that the article on mode radius contains an equation that can be used for calculating the mode radius and thus the effective mode area for a step index fiber.
Rp photonics encyclopedia fiber simulation software, mode. Pdf simulations of steplike bragg gratings in silica. How to design a rectangular stepindex optical fiber using. The scanner was used to calculate the transmission and reflection spectra into various mode orders. A stepindex fiber is an optical fiber that exhibits a stepindex profile. This might be a question better suited for the software recommendations side of s. A step index fiber is characterized by the core and cladding refractive indices n 1 and n 2 and the core and cladding radii a and b. Modal analysis of stepindex single mode fiber optic using. Study on mode coupling characteristics of multimode magneto.
Modelling of optical waveguide using comsol multiphysics. With such features, a fiber simulation software also becomes usable for many bulkoptical devices. Commercial solid core photonic crystal fibers for sensing. I have used the given tutorial of step index fiber. Analyze stepindex and gradedindex fibers with an app to perform mode analyses on the dielectric layer structures. I am a complete newbie to comsol multiphysics, but i have to study and simulate the effects of temperature on multimode optical fibers mmf. Can someone help me with constructing an optical fiber in comsol. Of the many modes of fibers, the guided modes are of particular interest, as they are important e. And we calculate the existing vector modes in fiber through the software comsol multiphysics. In this study numerical mode analysis techniques were applied to single mode step index fibres. Apr 23, 20 a stepindex fiber is an optical fiber that exhibits a stepindex profile.
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