Multiplex or demultiplex light from single/multiple ports to multiple/single ports
Keywords
optical, bidirectional
Ports
| Name | Type |
|---|---|
| port 1 | Optical Signal |
| port 2 | Optical Signal |
| port 3 | Optical Signal |
Properties
General Properties
| Name | Default value | Default unit | Range |
|---|---|---|---|
|
name Defines the name of the element. |
Optical MuxDemux | - | - |
|
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). |
Optical MuxDemux | - | - |
|
description A brief description of the elements functionality. |
Multiplex or demultiplex light from single/multiple ports to multiple/single ports | - | - |
|
prefix Defines the element name prefix. |
MUX | - | - |
|
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 |
|---|---|---|---|
|
configuration Defines the bidirectional or unidirectional element configuration. |
bidirectional | - | [bidirectional, demultiplexer, multiplexer |
|
number of ports Defines the number of output ports for the element. |
2 | - | [1, +∞) |
|
input parameter Defines whether the input parameter is a table with the channel frequencies or the first channel frequency and channel spacing. |
first channel and spacing | - | [first channel and spacing, channel frequencies |
|
first channel frequency The first frequency channel. |
193.1 |
THz* *std. unit is Hz |
(0, +∞) |
|
channel spacing The frequency channel spacing. |
100 |
GHz* *std. unit is Hz |
(0, +∞) |
|
channel frequency A table containing channel frequencies. |
<2> [193.1, 193.2] |
THz* *std. unit is Hz |
- |
|
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
The Optical MuxDemux (MUX) element can be used to combine/multiplex or split/demultiplex optical signals. The “configuration” property determines if the MUX element acts as a “multiplexer”, “demultiplexer”, or both (“bidirectional”).
These configurations are described below:
- Multiplexer: Multiple inputs are combined into a single output.
- Demultiplexer: Single input is separated into different channels at the outputs.
- Bidirectional: A combination of the “multiplexer” and “demultiplexer” configurations. Signals input into port 1 are demultiplexed into the other ports, and signals input into the other ports are multiplexed into the output of port 1.
Bandpass filters are applied to the inputs of the MUX element to isolate the channels. The characteristics of the channels are determined with the following MUX element properties:
- “number of ports”: The number of channels. Corresponds to the number of inputs (outputs) for the multiplexer (demultiplexer) configuration, or the number of ports in addition to port 1 for the bidirectional configuration.
- “input parameter”: The method for selecting the frequencies. The options are:
- “first channel and spacing”: The lowest frequency channel is selected with the “first channel frequency” property, and the other frequencies are spaced by “channel spacing” in ascending order.
- “channel frequencies”: Channels are specified with the “channel frequency” matrix.
- “bandwidth”: 3 dB bandwidth of filter.
- “order”: Order of the filter.
- “insertion loss”: Loss at maximum transmission of the filter.
Here is an example gain spectrum for the outputs of a MUX element in the demultiplexer configuration with the following properties:
- “number of ports”: 3
- “input parameter”: “first channel and spacing”
- “first channel frequency”: 193.1 THz
- “channel spacing”: 100 GHz
- “bandwidth”: 10 GHz
- “order”: 4
- “insertion loss”: 3 dB
In the INTERCONNECT Element library, the “Optical Multiplexer” element is the MUX element in the “multiplexer” configuration, the “Optical Demultiplexer” element is the MUX element in the “demultiplexer” configuration, and the “Optical MuxDemux” element is the MUX element in the “bidirectional” configuration. The configuration of these elements can be changed after adding them to the simulation.
Similar Elements
- Optical Splitter/Coupler: The “Optical Splitter/Coupler” element can also be used to split or combine optical signals, however it does not have channels. In other words, it does not apply filters to the inputs so the gain spectrum for each input/output is constant.
- Optical Add and Drop Multiplexer: The “Optical Add and Drop Multiplexer” element can also be used to split or combine optical signals, but it is used to add or drop individual channels from an optical signal.