Forum Replies Created

    #50115
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    Ahmad Atieh
    Participant

    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.

    regards,
    Ahmad

    #50112
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    Ahmad Atieh
    Participant

    Hello Liu,
    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.

    Regards,
    Ahmad

    #50111
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    Ahmad Atieh
    Participant

    Dear Taban,
    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

    Which version of OptiSystem do you use?

    Regards,
    Ahmad

    #50110
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    Ahmad Atieh
    Participant

    Hello Nghia,
    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\

    Regards,
    Ahmad

    #50091
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    Ahmad Atieh
    Participant

    please send the file as zip or .txt to my work email.

    #50087
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    Ahmad Atieh
    Participant

    Hello Phan,
    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 ahmad.atieh@optiwave.com, I’ll take a look at it.

    Regards,
    Ahmad

    #50086
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    Ahmad Atieh
    Participant

    Hello Asha,
    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.

    regards,
    Ahmad

    #50075
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    Ahmad Atieh
    Participant

    Dear Huseyin,
    Optiwave will be pleased to share with you the original project files and offer training once you acquire valid OptiSystem License. Thanks for evaluating OptiSystem software.

    regards,
    Ahmad

    #50061
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    Ahmad Atieh
    Participant

    Dear Ebraheem,
    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.
    regards,
    Ahmad

    #50058
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    Ahmad Atieh
    Participant

    Hello Mahmoud,
    you may find many examples on OFDM in OptiSystem example library. Please refer to the attached image for location and description of files.

    Which OptiSystem version do you use?

    Regards,
    Ahmad

    #50057
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    Ahmad Atieh
    Participant

    Dear Mehdi,
    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
    ahmad.atieh@optiwave.com

    regards,
    Ahmad

    #50051
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    Ahmad Atieh
    Participant

    Hello Nghia,
    you may try the example “WDM PON.osd” in OptiSystem example library. You can change the fiber parameters to any nonlinear effect you require to investigate.

    You may communicate with me at ahmad.atieh@optiwave.com if you need any other information.

    Regards,

    Ahmad

    #50041
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    Ahmad Atieh
    Participant

    please refer to the following examples in OptiSystem to guide you in building up your project(s).
    MM EDFA ExampleAllModesEquallyExcited.osd
    Multimode link.osd

    #50038
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    Ahmad Atieh
    Participant

    Hello Taban,
    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.

    regards,
    Ahmad

    #50033
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    Ahmad Atieh
    Participant

    This is related to OptiSystem scheduler that controls the calculation.

    Could you please let me know which OptiSystem version do you use? please communicate on ahmad.atieh@optiwave.com