- This topic has 5 replies, 2 voices, and was last updated 1 year, 11 months ago by
Sawyer Ge.
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December 12, 2022 at 12:54 pm #79925
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MemberHi,
I am trying to simulate degenerate four-wave mixing (2f2-f1 and 2f1-f2) in O-band. In my simulation I have two lasers (f1 and f2) multiplexed and transmitted over fiber. I also have two extra dummy lasers at -100dBm so that Optisystem will simulate the spectrum where the FWM products are expected to be.
For the fiber I am using the “Optical Fiber CWDM” component, since this is the one I will employ in my full system simulations. I have chosen the following settings to replicate SMF-28 fiber: Ref. wavelength=1312nm, Attenuation=0.4dB/km, Dispersion=0ps/nm/km, Dispersion slope=0.092ps/nm^2/km, DGD=0ps/km, SPM and XPM both enabled, Effective Area=67um^2, n2 = 27e-21m^2/W. All other fiber settings are the default ones.
In the simulation I perform a sweep of the wavelength spacing (lambda1-lambda2) from 0 to 25nm and for each iteration I am looking at the optical spectrum at the output of the fiber using an OSA. However, the spectrum does not seem correct for three reasons. First, increasing the frequency spacing does not affect the amplitude of the 2f1-f2 FWM product (fixed at -22 dBm). Second, there seem to be some aliasing that is producing some FWM products that do not land on frequencies multiples of delta_f from the signal frequencies (see iterations 3,6, and 9). Third, the 2f2-f1 product amplitude decreases with larger spacing (iterations 1 to 3), then increases (iterations 4 to 8), and then decreases again (iterations 9 to 10).
I have attached a zip file containing a screenshot of the testbench and the OSA from the 10 iterations from 0.5 to 5 THz spacing in 0.5 THz steps. Can you please tell me if there is a setting that I need to change to correct the simulation?
Thank you
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December 14, 2022 at 12:26 pm #81003
Ahmad AtiehModeratorHello,
I agree with you about the dependence of the amplitude of generated tones using FWM on the wavelength separation.
Could you please email me your OptiSystem project as zip file to check it? I need to check the setting of all other parameters in the layout.
you may email the zip file to ahmad.atieh@optiwave.com.
Also, please let me know the version of OptiSystem that you use?
Regards,
Ahmad -
December 14, 2022 at 12:26 pm #83607Ahmad AtiehModerator
Hello,
I agree with you about the dependence of the amplitude of generated tones using FWM on the wavelength separation.
Could you please email me your OptiSystem project as zip file to check it? I need to check the setting of all other parameters in the layout.
you may email the zip file to ahmad.atieh@optiwave.com.
Also, please let me know the version of OptiSystem that you use?
Regards,
Ahmad -
December 14, 2022 at 11:45 pm #81009
Kathleen KeynesMemberThank you for your reply. Please find attached the zip file of the OptiSystem project. This file builds on the Optisystem sample project “FWM” under “Fiber Analysis and Design/Optical Fiber Nonlinearity/FWM”.
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December 14, 2022 at 11:45 pm #83613Kathleen KeynesMember
Thank you for your reply. Please find attached the zip file of the OptiSystem project. This file builds on the Optisystem sample project “FWM” under “Fiber Analysis and Design/Optical Fiber Nonlinearity/FWM”.
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December 15, 2022 at 3:14 am #81011Kathleen KeynesMember
I forgot to mention, in the current setup, the sweep in the testbench goes from 0 to 38nm spacing. The OptiSystem version is 19.0.0.2409.
Thank you
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December 15, 2022 at 3:14 am #83615Kathleen KeynesMember
I forgot to mention, in the current setup, the sweep in the testbench goes from 0 to 38nm spacing. The OptiSystem version is 19.0.0.2409.
Thank you
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December 16, 2022 at 7:03 pm #81013Ahmad AtiehModerator
Hello,
The issue is the MUX channels’ set values are not swept with sweeping the frequency of the lasers.
You may communicate with me using my email ahmad.atieh@optiwave.com if you’d like to discuss further.
Regards,
Ahmad -
December 16, 2022 at 7:03 pm #83617Ahmad AtiehModerator
Hello,
The issue is the MUX channels’ set values are not swept with sweeping the frequency of the lasers.
You may communicate with me using my email ahmad.atieh@optiwave.com if you’d like to discuss further.
Regards,
Ahmad -
December 21, 2022 at 12:36 am #81033Kathleen KeynesMember
Hello,
The MUX channels are indeed swept with the frequency of the lasers, as seen in the attached image.
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December 21, 2022 at 12:36 am #83637Kathleen KeynesMember
Hello,
The MUX channels are indeed swept with the frequency of the lasers, as seen in the attached image.
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