- This topic has 15 replies, 4 voices, and was last updated 9 years, 2 months ago by
Taiwo Ambali Abiola.
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June 29, 2015 at 11:33 pm #22003
Taiwo Ambali Abiola
ParticipantI observed that using both Amplitude modulator and frequency modulator modules to modulate signals do not give corresponding amplitude modulated and frequency modulated signal out respectively. The same with Phase modulator when checked the output signal with Time Domain Visualizer. With Amplitude modulator, I am actually expecting and amplitude modulated signal in form of envelop. What is the hidden secrete behind this?
Thanks
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June 30, 2015 at 4:10 pm #22037
Damian Marek
ParticipantCould you please elaborate a little more? What type of output are you expecting and how it is different than the OptiSystem simulation?
Attaching your project file would also help. -
June 30, 2015 at 7:47 pm #22038
Taiwo Ambali Abiola
ParticipantThanks Damian,
I am actually expecting and envelop modulated signal based on the theory of amplitude modulation as attached in the .JPG file attached. The attached Pdf is what I saw when the signal is amplitude modulated. I noticed frequency modulator and phase modulator modules are also not giving me the expected response base on theory.Kindly help on what I am suppose to do.
Thanks.
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July 1, 2015 at 2:57 am #22044
Alessandro Festa
ParticipantHi Taiwo,
unfortunately, no attachment can be seen to your post. Can you post again and attach the images you are mentioning above?
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July 1, 2015 at 7:11 am #22048
Taiwo Ambali Abiola
ParticipantOh! sorry, Kindly find the two attached files. The last waveform (envelope) on the image file is what I was expecting but I got the attached pdf.
Kindly help.
Thanks
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July 1, 2015 at 7:14 am #22049
Taiwo Ambali Abiola
ParticipantSeems I can not attach the files or two different formats. I did on two different system.
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July 1, 2015 at 7:15 am #22051
Taiwo Ambali Abiola
Participantok, here is what I got
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July 1, 2015 at 11:42 pm #22069
Ravil
ParticipantHi Taiwo, according to the picture, which you have uploaded, you have your modulating signal. However, you are expecting to capture the envelope? I am not sure if OptiSystem allows you to do it this way. But, for the case of real oscilloscope I would agree with Alessandro…
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July 2, 2015 at 2:42 am #22073
Alessandro Festa
ParticipantYes, I do not see any option that allows you to detect the optical frequency instead of just the modulating signal at lower frequency…I don’t think you can do that with this visualizer on OptiSystem.
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July 1, 2015 at 7:24 am #22053
Alessandro Festa
ParticipantI do not understand where the problem is…the visulaizer is showing what you would see on an oscilloscope, where you cannot measure the “optical frequency” oscillation at about 190THz!
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July 2, 2015 at 3:35 am #22074
Taiwo Ambali Abiola
ParticipantOh! I see, thanks alot for the information both Festa and Ravil. I thought I would be able to see the envelope signals
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July 2, 2015 at 5:27 pm #22101
Ravil
ParticipantYou are welcome, Taiwo! As a forum member, I am always glad to give you my advice when I can. Good luck with your work and research!
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July 3, 2015 at 8:58 am #22124
Damian Marek
ParticipantJust coming back to give an official response, OptiSystem treats optical signals as complex envelopes for simulation purposes. It would slow down simulation time considerably if the software had to sample at optical frequencies >190 THz.
Regards
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July 2, 2015 at 4:18 am #22078
Alessandro Festa
ParticipantYou are welcome Taiwo!
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July 4, 2015 at 11:12 am #22168
Taiwo Ambali Abiola
ParticipantThanks a lot
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