A 1x2 strip waveguide MMI model described by fixed s-parameters. This models supports TE mode in c-band.
Note: For legacy data format (2022 R2.4 and older) please visit following link:
MMI (Fixed) - Lumfoundry Template (Legacy)
Template: mmi_1x2_strip_te_c
Photonic Model: spar_fixed
Quality Assurance Test: spar_fixed QA
Parameters: None.
Interoperability with Cadence Virtuoso:
- Circuit design flows using INTERCONNECT model: Yes.
- Circuit design flow using photonic Verilog-A model: Yes.
Application Gallery Example: MMI Coupler
Modeling Data
The source data template for a spar-fixed element can divided into two sections.
- For new users (continue with following section: Basic data requirement section)
- Advanced users ( continue with section: Complete Data Requirement )
In order to get started and add a custom MMI spar-fixed element into the compact model library (CML), a user only needs to edit the data listed in the ‘basic data requirement section’ below, while all other data (i.e. the advanced element data) can be left as is.
Note: Advanced users please jump start with Complete Data Requirement (for advanced users) section.
Basic data requirement section (for new users)
The basic or minimum data required to build the MMI s-parameter model is described below.
general
"general" is a struct with following fields:
Field |
Type |
Description |
description | string | A string containing a brief description of the model, which will be displayed to the end user. |
notes | cell |
A cell array that provides model notes which will be displayed to the end user. Each element of the cell is a struct with the fields:
|
ports
"ports" is a struct with following fields:
Field |
Type |
Description |
opt_X | struct with fields described in table below | Port definition corresponding to the X th optical port. |
Each struct above consists of following fields:
Field |
Type |
Description |
name | string | The name of the port, which will be visible to the end user. This name should be consistent with the name that will be used for netlisting. |
dir | string | The directionality of the port, either "Input", "Output", or "Bidirectional" |
pos | string | The side of the model which the port will be displayed on, either "Left", "Right", "Top", or "Bottom" |
order | number | The order at which the port is listed in a netlist. |
model_data
"model_data" is a struct with following fields:
Field |
Type |
Description |
mode_data |
Cell | n x 1 cell array (n number of modes). Each element of the cell is a struct with fields:
|
spar_filename | String | A string containing the filename of the s-parameter data file for this element. This must include the extension of the file (.txt) |
S_parameters file | File |
A text file containing directional coupler's s-parameters in Optical N Port S-Parameter format. The s-parameters must be defined for at least two frequency points. Note:
|
Complete data requirement (for advanced users)
The advanced data section provides a complete reference of data supported by the spar-fixed model including the basic required data described in the previous section.
The description of all the fields in the source data template are described below.
general
"general" is a struct with following fields:
[[snippet||11549514081811]]
ports
"ports" is a struct with following fields:
[[snippet||12147423089811]]
Each field above consists of following fields:
[[snippet||11549759363603]]
model_data
"model_data" is a struct with following fields:
[[snippet||12147882417043]]
S_parameters file | File |
A text file containing waveguide MMI s-parameters in Optical N Port S-Parameter format. The s-parameters must be defined for at least two frequency points. Note:
|
QA
"QA" is a struct with following fields:
[[snippet||12148587970835]]