Gaussian 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. |
Gaussian 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). |
Gaussian Optical Filter | - | - |
|
description A brief description of the elements functionality. |
Gaussian 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. |
1 | - | [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 |
|---|---|---|---|
|
single tap filter Defines whether or not to use a single tap digital filter to represent the element transfer function in time domain. |
false | - | [true, false] |
|
number of taps estimation Defines the method used to estimate the number of taps of the digital filter. |
fit tolerance | - | [disabled, fit tolerance, group delay |
|
filter fit tolerance Defines the mean square error for the fitting function. |
0.001 | - | (0, 1) |
|
window function Defines the window type for the digital filter. |
rectangular | - | [rectangular, hamming, hanning |
|
number of fir taps Defines the number of coefficients for digital filter. |
256 | - | [1, +∞) |
|
maximum number of fir taps Defines the number of coefficients for digital filter. |
4096 | - | [1, +∞) |
|
filter delay Defines the time delay equivalent to a number of coefficients for digital filter. |
0 | s | [0, +∞) |
|
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 Gaussian optical filter works, please see the example file: Gaussian_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.
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Fig. 1 Gaussian Optical Filter Transmission Plot |
Fig. 2 Gaussian Optical Filter Gain Plot |