[NEETHU NParticipant]

Sir, as I confronted another problem that there didn’t find any variation in the output spectrum due to low frequency signals(vibration), I was unable to proceed with Optisystem. Can’t detect any changes that sine wave signals in the kHz range make to the light wave.(I have asked about this problem in another question in the forum;couldn’t get a reply) . Sir, isn’t low frequency detection possible in Optisystem?

[NEETHU NParticipant]

Can anyone please rply?

[NEETHU NParticipant]

Sir, can’t we detect a low frequency signal using Optisystem software? No variation observed in the spectrum analyzer for frequencies less than about 50 MHz

[NEETHU NParticipant]

ok sir

[NEETHU NParticipant]

Thanks sir. Can I get the web-sight link for that webinar?

[NEETHU NParticipant]

OK sir, thanks.

[NEETHU NParticipant]

So, what can I do now.? ,to detect the backscattered light and to check the phase variation of the modulated light by the vbration?

[NEETHU NParticipant]

Yes sir, its working eventhough the the graph(or optisystem visualizer) is not like what is expecting. And it is about the next step I don’t know what to do. ie, get a vibration signal and interact this modulated light with that.

[NEETHU NParticipant]

Sir, chirp function was found from the ‘mathworks’ web sight. I used it to create linear frequency modulated pulses. Is chirp function is different?
https://in.mathworks.com/help/signal/ref/chirp.html.

But there is problems in the plots of signals. It is not like what we are expecting from the command. That is why I interchanged the two frequency values

[NEETHU NParticipant]

SIR ,PLEASE FIND THE ATTACHED

[NEETHU NParticipant]

Sir, I attach here the osd file. It has a MATLAB component. So attaching its code also.

An LFM signal is created and mixed with laser light- thats what I did upto now. Actually the project is to send this light through fiber and analyse the
backscattered light after interaction with the vibration signal.

[NEETHU NParticipant]

Ok sir.
So in which software I can do that? And also, can I make a relation between that variable and the vibration frequency I was intended to use??