I’ve noticed that you are using positive dispersion instead of negative dispersion that is needed to allow compensation. Also, I’ve noticed that the bandwidth of FBG is much smaller than the DWDM channels. You need to make sure that the FBG bandwidth contains the DWDM channels.
1. The “Resolution Bandwidth” setting in the RF Spectrum Analyzer (or optical spectrum analyzer) acts similarly to the actual instrument. It behaves like a filter to clean the received signal by filtering high noise out of it.
On the other hand, to increase the number of samples in the signal, you need to go to the main project layout, where you need to increase the number of samples per bit.
You need to be careful with the resolution bandwidth setting to avoid creating distortion to your signal.
2. Please refer to the description of signal types and structure in OptiSystem documentation.
Typically, you need noise pins in the setting to view ASE noise of EDFA. Parametric signals will not show ASE. It represent the signal as a single valued sample.
you may use the “Spatial CW Laser” component as a multimode pump. The component can be found in Default/Multimode Library/Transmitters/
You can control the number of modes generated etc.
A very good example (Spatial-Mode-Demultiplexing-Amplification.osd) on this topic can be found in the example library at
C:\Users\xxxxxxxxx\Documents\OptiSystem 15.2 Samples\Multimode systems
You may use the “ideal Dispersion Compensation FBG” component in OptiSystem after or before the fiber depending on your design to compensate the DWDM signal. You need to make sure that the “Bandwidth” parameter of the FBG includes all DWDM channels. After the compensation you place the DEMUX to separate the DWDM channels and detect each separately.
There is an example on post compensation in OptiSystem example library at
C:\Users\xxxxxxxx\Documents\OptiSystem 15.2 Samples\Dispersion compensation\
the red line is the Q-Factor of the received signal.
I am not sure what is your setup and I don’t understand the statement “My eye diagram is not the same as the eye analyzes”. If you can send the project layout as zip file, or change the extension to xxxx.txt and email it to email@example.com, I’ll take a look at it.
the MZM modulators in OptiSystem has no restrictions for the operating frequency or bandwidth. They operate according to the set bitrate selected in the global parameters. However, you have to make sure that you buy the proper modulator if you plan to conduct experimental work.
You need to follow the data structure of the component required by OptiSystem. That can be found in the data sheet. Attached is an image to show the structure for Pr+3 doped fiber.
There are few examples in OptiSystem examples library on sensors that can be found in the directory “Sensor systems”. One of these examples talks explicitly on FBG sensor design for temperature, stress and strain.
Which OptiSystem version do you have?
If you need more information, please contact me at firstname.lastname@example.org
You can have different kinds of index profiles for the MM EDF in addition to step index. You can control alpha in the parabolic index profile as well as load your external index profile. However, you must have the same format as explained in the component data sheet and shown in the attached image. Please refer to component data sheet for more information.