Measure and monitor CWDM channels power and wavelength
Keywords
analyzer, optical, unidirectional, bidirectional
Ports
Name | Type |
---|---|
input | Optical Signal |
Properties
General Properties
Name | Default value | Default unit | Range |
---|---|---|---|
name Defines the name of the element. |
Optical Channel Analyzer | - | - |
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 Channel Analyzer | - | - |
description A brief description of the elements functionality. |
Measure and monitor CWDM channels power and wavelength | - | - |
prefix Defines the element name prefix. |
OCN | - | - |
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. |
- | - | - |
icon type Defines the icon or element symbol view option. |
small | - | [small, medium |
Standard Properties
Name | Default value | Default unit | Range |
---|---|---|---|
signal reference input Defines whether or not to enable the signal reference input port. The reference port allows for measurements of gain and noise figure by comparing input signals from both input ports. |
false | - | [true, false] |
limit frequency range Enables setting the frequency range of the analysis. |
false | - | [true, false] |
start frequency The lower frequency limit of the analysis. |
190 |
THz* *std. unit is Hz |
(0, +∞) |
stop frequency The upper frequency limit of the analysis. |
200 |
THz* *std. unit is Hz |
(0, +∞) |
plot kind This option allow users to choose to plot in units of frequency or wavelength. |
frequency | - | [frequency, wavelength |
power unit Defines the power unit to plot the results. |
dBm | - | [W, dBm |
frequency channels Defines whether the channel frequency values are defined as a table or the values are automatic calculated from peak detection. |
automatic | - | [automatic, user defined |
peak threshold Signal power must be greater than the power established by the peak threshold limit. The peak threshold limit is set by subtracting the peak threshold value from the power of the largest signal peak value. |
10 | dB | [0, +∞) |
peak excursion The peak excursion defines the rise and fall in amplitude that must take place in order for a peak to be recognized. |
6 | dB | [0, +∞) |
pit excursion The pit excursion value is used to determine whether or not a local minimum in the signal is to be considered a pit. |
10 | dB | [0, +∞) |
channels table The table containing the channel frequency values |
<50> [191.2, 191.3, 191.4,...] |
THz* *std. unit is Hz |
- |
load channels from file Defines whether or not to load frequency values from an input file or to use the currently stored values. |
false | - | [true, false] |
channels filename The file containing the channel frequency values. Refer to the Implementation Details section for the format expected. |
- | - | - |
sensitivity The minimum detectable signal power level. |
-100 |
dBm* *std. unit is W |
(-∞, +∞) |
bandwidth Defines the resolution bandwidth. |
12.5 |
GHz* *std. unit is Hz |
[0, +∞) |
interpolation offset Defines the interpolation offset used for determining noise. It is the offset applied on each side of a detected signal peak. |
12.5 |
GHz* *std. unit is Hz |
[0, +∞) |
limit time range Enables setting the time range( start/stop) of the analysis. |
false | - | [true, false] |
start time Time instant to start the signal analysis. |
0 | s | [0, +∞) |
stop time Time instant to stop the signal analysis. |
1 | s | [0, +∞) |
Simulation Properties
Name | Default value | Default unit | Range |
---|---|---|---|
input signal selection Input signal selection option. |
last | - | [last, index |
input signal index The signal index to analyzed. |
1 | - | [1, +∞) |
include delays Defines whether inserted delays should be included as part of the signal or not. |
false | - | [true, false] |
include noise bins Defines whether noise bins are included in the power value. |
true | - | [true, false] |
Display Properties
Name | Default value | Default unit | Range |
---|---|---|---|
refresh Defines whether or not to update display and annotations during the simulation. |
true | - | [true, false] |
refresh length Defines how ofter to update the element. This is the minimum number of new data values available at the element input port that will trigger the element update. |
8192 | - | [0, +∞) |
Results
Name | Description |
---|---|
channels | The list of detected channel frequency values from the input signal. |
signal power | The list of signal powers from the input signal, measured at each channel frequency. |
noise power | The list of noise powers from the input signal, measured at each channel frequency. |
OSNR | The list of OSNR values from the input signal, measured at each channel frequency. |
input/signal power | The list of signal powers from the input signal, measured at each channel frequency. |
input/noise power | The list of noise powers, from the input signal measured at each channel frequency. |
input/OSNR | The list of OSNR values from the input signal, measured at each channel frequency. |
reference/signal power | The list of signal powers from the reference signal, measured at each channel frequency. |
reference/noise power | The list of noise powers, from the reference signal measured at each channel frequency. |
reference/OSNR | The list of OSNR values from the reference signal, measured at each channel frequency. |
gain | The list of gain values calculated between the input and the reference signal, measured at each channel frequency. |
noise figure | The list of noise figure values calculated between the input and the reference signal, measured at each channel frequency. |
OSNR/minimum | The minimum OSNR value and its channel frequency. |
OSNR/maximum | The maximum OSNR value and its channel frequency. |
OSNR/delta | The difference between the maximum and minimum OSNR values. |
signal power/minimum | The minimum signal power value and its channel frequency. |
signal power/maximum | The maximum signal power value and its channel frequency. |
signal power/delta | The difference between the maximum and minimum signal power values. |
noise power/minimum | The minimum noise power value and its channel frequency. |
noise power/maximum | The maximum noise power value and its channel frequency. |
noise power/delta | The difference between the maximum and minimum noise power values. |
gain/minimum | The minimum gain value and its channel frequency. |
gain/maximum | The maximum gain value and its channel frequency. |
gain/delta | The difference between the maximum and minimum gain values. |
noise figure/minimum | The minimum noise figure value and its channel frequency. |
noise figure/maximum | The maximum noise figure value and its channel frequency. |
noise figure/delta | The difference between the maximum and minimum noise figure values. |
input/OSNR/minimum | The minimum input OSNR value and its channel frequency. |
input/OSNR/maximum | The maximum input OSNR value and its channel frequency. |
input/OSNR/delta | The difference between the maximum and minimum input OSNR values. |
reference/OSNR/minimum | The minimum reference OSNR value and its channel frequency. |
reference/OSNR/maximum | The maximum reference OSNR value and its channel frequency. |
reference/OSNR/delta | The difference between the maximum and minimum reference OSNR values. |
input/signal power/minimum | The minimum input signal power value and its channel frequency. |
input/signal power/maximum | The maximum input signal power value and its channel frequency. |
input/signal power/delta | The difference between the maximum and minimum input signal power values. |
input/noise power/minimum | The minimum input noise power value and its channel frequency. |
input/noise power/maximum | The maximum input noise power value and its channel frequency. |
input/noise power/delta | The difference between the maximum and minimum input noise power values. |
reference/signal power/minimum | The minimum reference signal power value and its channel frequency. |
reference/signal power/maximum | The maximum reference signal power value and its channel frequency. |
reference/signal power/delta | The difference between the maximum and minimum reference signal power values. |
reference/noise power/minimum | The minimum reference noise power value and its channel frequency. |
reference/noise power/maximum | The maximum reference noise power value and its channel frequency. |
reference/noise power/delta | The difference between the maximum and minimum reference noise power values. |
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Implementation Details
The Optical Channel Analyzer measures and monitors the channel power and wavelength/frequency for WDM systems. It can measure not only the signal power but also the noise power in the system and hence the optical signal to noise ratio (OSNR). It also allows a reference input, so that the gain/loss in the channels can also been detected. Please see the example file Optical_Channel_Analyzer.icp for detailed information on this element. The following figure shows the system in the example file.
The plot kind of the OCN can be set to "frequency" or "wavelength", which is the plot unit at the location where the channel peaks detected. The power unit can be "W" or "dBm". Signal power is measured at each channel frequency. The following figures are the measured results for a "none"/"even" Splitter with different plot kind and power unit settings.
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If reference input is enabled, the OCN will also detect and measure the reference signal and compare it to the input signal to calculate the associated gain/loss. Following is an example of enabling reference input for the OCN and taking the channel at 193.1 THz as a reference. The results window is given as well.
Note that the noise figure measurement performed by the OCN assumes a shot noise limited input. See the optical amplifier documentation for more information.