Fiber optic based pressure sensor using comsol multiphysics. Rp photonics encyclopedia fiber simulation software, mode. Modelling of optical waveguide using comsol multiphysics. The mode properties are determined by the refractive index profile of the fiber. Notably, it is a referred, highly indexed, online international journal with high impact factor. The oam transmission fiber based on stepindex and gradedindex. Analysis of single mode step index fibres using finite. How to design a rectangular stepindex optical fiber using. The main purpose of this numerical simulation was to obtain insights on the performance of the optical fibre. How to calculate sbs gain for a step index fibre using comsol multiphysics. With comsol multiphysics, you will be able to account for coupled or multiphysics phenomena. For every different value of radius of its core, a range of wavelength, the effective propagating mode area, and the effective. The most popular versions among comsol multiphysics users are 4.
This model is an example of a single step index waveguide made of silica glass. With such features, a fiber simulation software also becomes usable for many bulkoptical devices. Apr 23, 20 a stepindex fiber is an optical fiber that exhibits a stepindex profile. This software was originally produced by comsol ab. 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. 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 shown in figure 1. This structure was solved in cylindrical coordinates using the fdm fibre solver. Analyze stepindex and gradedindex fibers with an app to perform mode analyses on the dielectric layer structures. Easily couple different physical effects in one analysis with the comsol multiphysics software and the wave optics module. Due to the strain variations we can calculate the change in length of fiber. Comsol access comsol multiphysics modeling software. 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 esm.
Supercontinuum generation by intermodal fourwave mixing. Multiphysics software models multimaterial optical. Modelling of optical waveguide using comsol multiphysics ijert. Mode analysis of different step index optical fibers at. A simulation was performed using the modal analysis in the electromagnetic wave frequency domain in comsol. A new type of fiber acoustooptic device, based on tapered singlemode fiber, is described. Rp photonics encyclopedia effective mode area, fiber, waveguide.
Single mode optical fiber smf and multimode optical fiber mmf intensity distributions were presented in 2d design. As fimmprop is a frequencydomain tool, the wavelength was varied using the fimmprop scanner, an automated tool allowing to perform parametric scans. In this research, new software comsol multiphysics v. When defining and solving these problems, the fluid is modeled as incompressible by default but can. 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. Fiber optics revolutionized communication with more applications to come. By submitting this form you agree to have your information shared with, and be contacted by, addlink software cientifico. Aug, 2018 in this video, we will learn how to perform the mode analysis. International journal of science and research ijsr is published as a monthly journal with 12 issues per year.
The application gallery features comsol multiphysics tutorial and demo. 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. Can someone help me with constructing an optical fiber in comsol. A stepindex fiber is an optical fiber that exhibits a stepindex profile.
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. 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. I am construing an optical fiber like stepindex fiber in comsol. If you do not yet have a comsol access account, please create one now. Pdf simulations of steplike bragg gratings in silica. How to design a rectangular stepindex optical fiber using comsol. 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. Then, a 3d model of fbg was built on smf with the same parameters of core and clad radius. 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. Most electromagnetic components, devices, and products are affected by another branch of physics, whether it be heat transfer, structural mechanics, or. The effective index can be controlled with the size of air holes in the first ring of a fiber. Stepindex fiber simulation comsol blog comsol multiphysics. Comsol multiphysics software video for single mode fiber. For a comprehensive analysis, use the comsol multiphysics software and the acdc module to see how multiple physics affect your design.
A stepindex fiber is an optical fiber with a stepindex profile. The stepindex fiber has a high refractive index ring which. In this study numerical mode analysis techniques were applied to single mode step index fibres. Properties of interest can be, for example, the shapes of the amplitude or intensity distribution of modes. Study of bending losses in optical fibers using comsol.
It is difficult to find the zero for curves of this type. 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. I am construing an optical fiber like step index fiber in comsol. Wave optics software for analyzing micro and nanooptical. Stepindex fiber comsol multiphysics modeling software.
Multiphysics software models multimaterial optical fibers. Fem based commercial comsol software and shown in fig. These values are valid for freespace wavelengths of 1. Em mode analysis for the circular waveguide comsol.
Driving illumination function is modified lg mode that approximates a perfect charge 1 vortex matched to this fiber diameter. After a general introduction to the user interface, several tutorials will take you step by step through sample models that highlight important features. Of the many modes of fibers, the guided modes are of particular interest, as they are important e. Wave optics module application gallery examples comsol. 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. It allows conventional physicsbased user interfaces and coupled systems of partial differential equations pdes. Using high pressure chemical vapor deposition to make.
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. The informative charts give you an idea of comsols capability by associated files, functions, and builtin options. You can find the number of modes that can be propagated with the lowest attenuation in any type of structure. The mathematical modeling of the stepindex optical fiber was performed in the comsol multiphysics software. The design and physically analysis of optical fiber was performed using the comsol multiphysics software package v.
The sidelobes of the fbg may be removed by apodizing the grating. Commercial solid core photonic crystal fibers for sensing. Akhilesh, in a conventional step index fiber the modes inside the core are so confined that air has a negligible role in the simulations. Results for effective index, effective area, nonlinear coefficient and the dispersion are presented. 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. Adding and customizing expressions in the physics interfaces allows for freely coupling them with each. By the end you will be well on your way to reaping all. However, our main objective is to simulate and design graded.
This might be a question better suited for the software recommendations side of s. Comsol multiphysics is a crossplatform finite element analysis, solver and multiphysics simulation software. Unlike earlier designs, the overlap between the acoustic and optical waves is complete, so very little. I have used the given tutorial of step index fiber. 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 first part of the application computes the modes for a straight step index fiber made of silica glass.
Intensity distributions of linearly polarized modes 12. The insets show the electric field amplitudes of the spatial lp modes. Supercontinuum generation by intermodal fourwave mixing in a. Design and simulation of fiber bragg grating by comsol. Cad import module import cad files into the comsol software. All of the features listed below are implemented through associated physics interfaces.
Design and characterization study of endless single mode. And we calculate the existing vector modes in fiber through the software comsol multiphysics. Simulation of vector mode grating coupler interfaces for. Modal analysis of stepindex single mode fiber optic using. 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. Fiber bragg grating model simulation with fimmprop software. I am looking for a free not only as in freedom alternative to comsol multiphysics. 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. The step index profile corresponds to a powerlaw index profile with the profile parameter approaching infinity. Investigating the performance of apodized fiber bragg. Cfd software for simulating fluid flow applications. 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.
Mar 22, 20 2 responses to modal analysis of stepindex single mode fiber optic using comsol multiphysics 4. The stepindex profile can be used for both singlemode and. 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. How to design graded index fiber profile in comsol ndn hub. The cad import module addon to comsol multiphysics has two basic functions for assisting your modeling workflow. Periodically poled lithium niobate waveguides for quantum. The step index profile is used in most singlemode fibers and some multimode fibers. Semiconductor step index fibers consisting of silicon or germanium core silica cladding have been simulated using comsol software as. This model is an example of a single stepindex waveguide made of silica glass. Study on mode coupling characteristics of multimode magneto.
The scanner was used to calculate the transmission and reflection spectra into various mode orders. Comsol multiphysics is compatible with windows xp7810 environment, 32 and 64bit versions. In this paper, we demonstrate the use of the commercial fem software, comsol, in studying the behaviour of single mode step index fibres. On effective refractive index the first step is it is assumed that the pcf s are made of silica of background refractive index 1. How to simulate a mmf fiber in comsol multiphysics. If two fibers with different effective mode areas are spliced together, this will lead to some optical power loss. The transmission speed of optical waveguides is superior to microwave waveguides, because optical devices. The combination of comsol products required to model your application depends on several factors and may include.
The structure designed in fimmprop is shown below, as well as the modes of the fibre. I am a complete newbie to comsol multiphysics, but i have to study and simulate the effects of temperature on multimode optical fibers mmf. Comsol provides an ide and unified workflow for electrical, mechanical, fluid, acoustics and chemical applications. The optical fiber design is simulated to produce multi. 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. Comsol multiphysics software understand, predict, and optimize. 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. With more than 30 addon products to choose from, you can further expand the simulation platform with dedicated physics interfaces and tools for. The stepindex profile corresponds to a powerlaw index profile with the profile parameter approaching infinity. Effective index as a function of the optical wavelength for five main spatial lp modes. Rp photonics encyclopedia fiber simulation software. Comsol access is a service we provide to our users and prospects. The inner core is made of pure silica glass with refractive index n 1 1. How to calculate sbs gain for a step index fibre using comsol.
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