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In this issue:


RSoft Application


Quick Tip: New GDS File Import/Export Approaches with RSoft CAD


Designs for photonic devices such as photonic integrated circuits (PICs) and diffractive optical elements (DOEs) are commonly represented by one or more graphic data system (GDS) mask files. These files contain information about the design such as the layer layout, shapes, and text labels. This tip describes several ways to import and export GDS files within the RSoft CAD Environment™.


1.       Dynamically Import GDS via Hierarchy


The RSoft CAD is a hierarchical design environment where a design can be a combination of items such as native components, other designs, and GDS files. This tip will focus on using GDS files dynamically within the RSoft CAD with a circuit reference (a component that refers to another design). Figure 1 shows a sample Properties for Circuit Reference dialog box in which a GDS file has been selected by the External File option. By default, all layers within the GDS will be imported in the XZ plane. However, a specific layer can be imported using the file:layer# syntax as shown in Figure 1. Alternatively, you can import the layer to the XY plane using the file:layer#,xy syntax. The material, position, thickness, and other properties of each circuit reference component can be separately controlled, allowing complicated designs to be easily built from one or more layers. Furthermore, you can combine GDS-defined structures with native structures to achieve fully custom structures.


Figure 1. CAD hierarchy import dialog


Figure 2 shows a simple vertical grating coupler imported with two layers. Two circuit reference components were used, one for each layer in the GDS file.



Figure 2. A vertical grating coupler GDS import example with multiple layers


Figure 3 shows a Dammann grating mask imported to both the XZ and XY planes. Note that the GDS import is dynamic; if you change or modify the GDS file, the RSoft layout is updated to reflect the changes. If needed, you can also permanently convert the GDS to an RSoft .ind design file with the gds2ind command-line utility.



Figure 3. A Dammann grating mask imported in the XZ and XY planes via hierarchy


2.       Using GDS Export Options


The RSoft CAD supports GDS export, which is a required step before sending a device for verification and fabrication. GDS files can be exported from either the XY, XZ, and YZ planes for all components in the design or at a specific cut position. Figure 4 shows a Dammann grating exported to a mask in a Z cut specified in the Export GDS dialog box (menu CAD File > Export > GDS). The GDS data can be spatially clipped to a range that defaults to the simulation domain. The GDS export process can be automated via script using the using the ind2gds command-line utility.



Figure 4. A Dammann grating exported to a GDS mask via Z cut plane


For more details about importing and exporting GDS files in the RSoft CAD Environment, refer to Section 6.E in the RSoft CAD User Guide.






META 2019

10th International Conference on Metamaterials, Photonic Crystals and Plasmonics

July 23 - 26, 2019

Instituto Superior Tecnico

Lisbon – Portugal



Exhibition 2019

September 23 - 26, 2019

The RDS Venue

Dublin - Ireland


Training RSoft Component Tool

October 1st to 3rd

Hyères - France

Price : 1 200 €


You can see all our events on our website : Agenda


To register to one of these trainings, please send an email to sales@lighttec.eu.com with the desired training and date. 


Kind regards,


Pôle d'Activités Hyérois
1128 Route de Toulon
83400 Hyères - France
Phone: +33 494 12 18 48

Email: sales@lighttec.eu.com
Web site: www.lighttec.fr

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