Butterworth optical filter
Keywords
optical, unidirectional
Ports
Name | Type |
---|---|
input | Optical Signal |
output | Optical Signal |
Properties
General Properties
Name | Default value | Default unit | Range |
---|---|---|---|
name Defines the name of the element. |
Butterworth Optical Filter | - | - |
annotate Defines whether or not to display annotations on the schematic editor. |
true | - | [true, false] |
enabled Defines whether or not the element is enabled. |
true | - | [true, false] |
type Defines the element unique type (read only). |
Butterworth Optical Filter | - | - |
description A brief description of the elements functionality. |
Butterworth optical filter | - | - |
prefix Defines the element name prefix. |
OBP | - | - |
model Defines the element model name. |
- | - | - |
library Defines the element location or source in the library (custom or design kit). |
- | - | - |
local path Defines the local path or working folder $LOCAL for the element. |
- | - | - |
url An optional URL address pointing to the element online help. |
- | - | - |
Standard Properties
Name | Default value | Default unit | Range |
---|---|---|---|
frequency Central frequency of operation. |
193.1 |
THz* *std. unit is Hz |
(0, +∞) |
bandwidth The 3-dB bandwidth of the filter (full with at half maximum, FWHM). |
10 |
GHz* *std. unit is Hz |
[0, +∞) |
order Defines the filter order. |
4 | - | [1, 10] |
insertion loss Defines the insertion loss (attenuation). |
0 | dB | [0, +∞) |
Waveguide Properties
Name | Default value | Default unit | Range |
---|---|---|---|
modes List of optical mode labels supported by the element. |
TE,TM | - | - |
Numerical/Digital Filter Properties
Name | Default value | Default unit | Range |
---|---|---|---|
initialize filter taps Defines whether to use the initial input signal to initialize filter state values or to set them to zero values. |
false | - | [true, false] |
Diagnostic Properties
Name | Default value | Default unit | Range |
---|---|---|---|
run diagnostic Enables the frequency response of the designed filter implementation and the ideal frequency response to be generated as results. |
false | - | [true, false] |
diagnostic size The number of frequency points used when calculating the filter frequency response. |
1024 | - | [2, +∞) |
Results
Name | Description |
---|---|
diagnostic/response #/transmission | The complex transmission vs. frequency corresponding to the ideal and designed filter. |
diagnostic/response #/gain | The gain vs. frequency corresponding to the ideal and designed filter. |
diagnostic/response #/error | Mean square error comparing the frequency response of the designed filter implementation with the ideal frequency response. |
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Implementation Details
Following is an example and implementation details of how the optical Butterworth filter works, please see the example file: Butterworth_Optical_Filter.icp
The key features for this element are the filter's order and bandwidth. Following figures show how the bandwidth and order affect the filter's performances.
Fig. 1 Butterworth Optical Filter Transmission Plot |
Fig. 2 Butterworth Optical Filter Gain Plot |