This material may be skipped initially, however it introduces terminology and notation which is important for understanding other discussions in the manual. Larger step size improves rate of convergence, but too large a step size causes convergence to unwanted modes. The mode spectrum represents the FFT of the correlation function, as described in the above reference. The Launch Field One must launch a field which excites all the possible modes.
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Numerical Solution and Boundary Conditions Note that to save the simulation results, simply enter a prefix in the Output File Prefix field of the simulation parameters dialog, and select the desired data files via the Output… button.
BeamPROP for Windows Demo
These options are discussed in Section 7. The BeamPROP directory also contains a subdirectory called router which contains documentation and several example files for designing arrayed-waveguide-grating WDM routers.
Waveguides integrated on a substrate: There are several additional options which control the far field calculations. Beamprpo this case, extend the domain to encompass the important fields. These conventions, along with Maxwell's equations, imply that TE polarization is along y and TM polarization is along x.
beamrpop OptiBPM is a comprehensive Bfamprop environment based on the beam propagation method used for the design of complex optical waveguides.
Display Options The Display Mode field in the Simulation Parameters window which controls one display related option; the rest of the display options are contained in the Display Options dialog box which can be accessed via the Display… button.
To set the offset, which is the length in this case, set the Parameter Value equal to the variable Length we previously defined.
A full vectorial generalized discontinuous Galerkin beam prop..|INIS
A diagram showing a portion of an optical beampprop line circuit which is designed to tap light from an input waveguide at different positions in order to create different optical path delays. A continuous version of this option is used in displaying baemprop fields. At this point, a layout window is created within the main program window, as shown in Fig.
At the end of the first field computation the mode spectrum display flashes on screen, and a second field computation begins.
To first order this leads to the standard paraxial BPM, and to higher order it becomes more accurate and represents one approach to achieving a wide-angle scheme. Beamprkp first section will discuss the program operation, and the rest of the chapter will discuss in detail the basic simulation options.
BeamPROP for Windows Demo
Its default behavior is Rectangular for channel structure types, and Elliptical for fiber structure types. Hooker, "Tapered polymer single-mode waveguides for mode transformation," J. The monitors dialog which allows various quantities to be monitored along optical pathways during the simulation. Mode Solving 59 6. All other product names referred to in this document are trademarks or registered trademarks of their respective manufacturers.
For the purposes of this example, we will not explore each the use of all the fields in this dialog. Background N This numeric input field selects the background index for the slab waveguide mode s to be launched. Geometry and Orientation The index gradient is along both x and y, thus no particular orientation is necessarily selected out. The graphical display shows a top view of the circuit being modeled in redand plots the transverse profile of the field amplitude at several positions along the device in blue.
Thus, the vector modes are as follows: For semi-vectorial simulations, the polarization of the launch is set equal to the Polarization set in the Global Settings, and for scalar simulations, the polarization does not need to be defined. Note that for this option to work properly, the waveguide used in calculating the mode must have its X and Y position set equal to 0. Modes which have an effective index smaller than this value will not be solved for.
The Launch Condition The launch field, or excitation, is the initial condition for the simulation, and is set via the Launch Parameters dialog shown in Fig. Index Max This field sets the maximum index used when calculating an index profile.
The final layout of the example circuit illustrated in Fig. The main CAD program window, showing the menubar at the top, the top and left toolbars, and the status line at the bottom. None No graphical display. It is now assumed that the variation of u with z is sufficiently slow so that the first term above can be neglected with respect to the second; this is the familiar slowly varying envelope beakprop and in this context it is also referred to as the paraxial or parabolic approximation.