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GratingMOD 3.1 User Guide RSoft Design Group, Inc. 400 Executive Blvd. ã Suite 100 Ossining, NY 10562 Phone: 1ã914ã923ã2164 Fax: 1ã914ã923ã2169 info@rsoftdesign.com www.rsoftdesign.com Copyright © 2001-2008 All Rights Reserved. Contents Preface 1 Notices ....................................................................................................................................... 2 Limited Warranty ......................................................................................
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  GratingMOD 3.1 User Guide  RSoft Design Group, Inc.400 Executive Blvd. ã Suite 100Ossining, NY 10562Phone: 1ã914ã923ã2164Fax: 1ã914ã923ã2169info@rsoftdesign.comwww.rsoftdesign.com  Copyright © 2001-2008 All Rights Reserved.     GratingMOD 3.1 User Guide  Contents ã iii Contents Preface1    Notices.......................................................................................................................................2   Limited Warranty........................................................................................................2   Copyright Notice.........................................................................................................2   RSoft Design Group™ Trademarks............................................................................2   Acknowledgments.......................................................................................................2   System Requirements................................................................................................................2   How to read this manual............................................................................................................2   What should I read and when?....................................................................................2   Conventions...............................................................................................................................3   Physics Conventions....................................................................................................3   Manual Conventions....................................................................................................3   Product Name Conventions.........................................................................................3   Chapter 1: Introduction5   1.A. Overview of Capabilities and Features..............................................................................5   1.B. Technical Background.......................................................................................................6   1.B.1. Coupled-Mode Theory......................................................................................6   1.B.2. Transfer Matrix.................................................................................................7   1.B.3. Continuous Layer Peeling Technique...............................................................7   Chapter 2: Installation9   2.A. Main Program Installation.................................................................................................9   Existing RSoft users....................................................................................................9   First-time RSoft users..................................................................................................9   Backing up the Examples............................................................................................9   2.B. Testing the GratingMOD installation.................................................................................9   2.C. What Next?.....................................................................................................................11   README File...........................................................................................................11   Technical Support & Software Upgrades..................................................................11   Chapter 3: Grating Analysis13   3.A. Getting Started.................................................................................................................13   Step 1: Creating a new GratingMOD design file......................................................14   Step 2: Laying out the waveguide(s) and defining waveguide parameters................15   Step 3: Defining the Grating Perturbation.................................................................15   Step 4: Checking the Index Profile............................................................................16   Step 5: Defining the Analysis Parameters.................................................................17   Step 6: Defining the Modes to be Used.....................................................................18   Step 7: Setting Output Options..................................................................................18   Step 8: Starting the Simulation..................................................................................18   3.B. Grating Structure Layout..................................................................................................18   3.B.1. Defining the Periodicity/Taper of the Segment..............................................18    iv ã Contents GratingMOD 3.1 User Guide 3.B.2. Defining Cross Sections and User Profiles.....................................................20   3.C. Automatic Layout with the Layout Generator.................................................................20   3.D. Grating Analysis Simulation............................................................................................22   3.D.1. GratingMOD Simulation – Grating Analysis Window..................................22   3.D.2. Analysis Parameters Tab................................................................................23   3.D.3. Mode Selection Tab........................................................................................25   3.D.4. Spectral Characteristics Tab...........................................................................27   3.E. Performing the Analysis..................................................................................................29   3.E.1. Analysis Output Options.................................................................................29   3.E.2. Analysis Output File Formats.........................................................................30   3.F. Parameter Scans................................................................................................................30   Chapter 4: Grating Synthesis31   4.A. Getting Started.................................................................................................................31   Step 1: Creating a new GratingMOD design file......................................................31   Step 2: Choosing a Grating Synthesis Calculation Type...........................................32   Step 3: Defining the Input Spectrum.........................................................................33   Step 4: Defining the Target Spectrum.......................................................................34   Step 5: Defining the Synthesis Parameters................................................................34   Step 6: Setting Output Options..................................................................................35   Step 7: Starting the Simulation.................................................................................35   4.B. Synthesis Basics...............................................................................................................35   4.B.1. GratingMOD Simulation – Grating Synthesis Window.................................35   4.B.2. The Input Spectrum Tab.................................................................................36   4.B.3. Creating a Realizable Spectrum......................................................................38   4.B.4. The Target Spectrum Tab...............................................................................39   4.B.5. The Synthesis Parameters Tab........................................................................40   4.C. Performing the Synthesis.................................................................................................42   4.C.1. Synthesis Output Options...............................................................................42   4.C.2. Synthesis Output File Formats........................................................................43   Chapter 5: Analysis Tutorials45   Tutorial A1: 2D Grating with Width Modulation....................................................................45   Using the Grating Layout Utility...............................................................................45   Editing Grating Parameters.......................................................................................45   Performing a Simulation............................................................................................48   Tutorial A2: 2D Slab Grating with Index Modulation.............................................................51   Creating the Grating Structure...................................................................................51   Performing the Simulation........................................................................................52   Tutorial A3: Fiber Bragg Grating...........................................................................................53   Setting up the Fiber...................................................................................................53   Calculating Reflection Spectra & Delay....................................................................54   Decorating the Plots (Optional).................................................................................56   Tutorial A4: Grating with Apodization....................................................................................61   Adding Apodization..................................................................................................61   Performing the Simulation........................................................................................61   Tutorial A5: Grating with Chirp..............................................................................................63   Adding Chirp.............................................................................................................63   Viewing Apodization and Chirp................................................................................64   Tutorial A6: Grating with Multiple Sections...........................................................................65   Creating Another Segment........................................................................................65   Performing the Simulation........................................................................................66   Tutorial A7: Using Non-Analytic Modes................................................................................67   Creating the Grating Structure...................................................................................67  
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