- This topic has 8 replies, 4 voices, and was last updated 9 years, 2 months ago by
alistu.
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September 25, 2015 at 11:05 pm #25298
SashaParticipantHi All,
I tried to implement an system design power budget with optical fiber. My transmitter input power = -3.218dbm and optical fiber length = 1km, attenuation = 2.61dm/km and I am getting total power output as -7.614dbm. It shows total power loss = 4.396dbm but in link I am having a loss of only 2.61db.
In optiwave sample files they have shown the system design power budget file by using attenuator and they are getting exact output.
Here I attached the file.
Thanks in advance
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September 25, 2015 at 11:07 pm #25300SashaParticipant
Optiwave system design power budget file
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September 26, 2015 at 12:44 am #25307
Abhishek ShramaParticipantHi Sasha
The optisystem sample file that you have attached is providing results to me in required manner.In file the attenuater is set to 27dB and overall power after attenuation is -30.010.Transmitter laser power is 0dB and after MZM comes out to be -3.010dB due to insertion losses and all.
I have tried by deleting attenuator and inserted a SMF of same attenuation i.e 27dB .I got the same results with fiber and attenuation.Value at BER is also same order of 10^-9
Try it as i said and if there is than any problem let me know
Thank you -
September 26, 2015 at 12:47 am #25308Abhishek ShramaParticipant
Since i am using a older version of optisystem so could not able to upload the system file.However as i stated above by taking value of attenuation 0.2dB/Km (default in optical fiber lib. component SMF) you can test it.
Kindly see the screen shot of the system ,i have calculated the value of fiber as
135Km x 0.2dB=27dB
Which corresponds to the attenuation value at attenuator -
September 26, 2015 at 6:01 am #25333
MHD NAParticipantHi Sasha;
you have some mistakes in calculation the required length of fiber, so you should modify its length and observe the output power to reach to wanted value which is corresponding to fiber length.Regards,
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September 26, 2015 at 6:30 am #25335Abhishek ShramaParticipant
Hi! Mohammad namera,I think this would be the case that author didnt get desired power at output.Since it works fine for me without any issue.Thank you for your help
I just did basic calculation and got desired results -
September 26, 2015 at 9:46 am #25362SashaParticipant
Hi Sharma,
when using the SMF, I got the attenuation output as -30db.Actually I want to get the output for multimode fiber. And when I am giving the same attenuation and length for MMF fiber and I am getting total output power = -33.4db. What is the change should I do in MMF fiber?
Thanks in advance
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September 26, 2015 at 9:58 am #25363SashaParticipant
Hi Mohammed,
I tried as you said for MMF fiber and SMF fiber. It worked for SMF fiber but not for MMF fiber. What is the change should I do in MMF fiber?
I fixed the values as
Source power = -3.148db
attenuation = 0.2db/km
length = 135km
then I should get the total power output = -30.148db
but instead of that i am getting total power output = -33.426dbI attached the file here.
Thanks in advance.
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September 26, 2015 at 1:18 pm #25383
alistuParticipantUnfortunately, I don’t know the exact reason for the attenuation caused by the fiber to be more more than the attenuation value given and I couldn’t find a reason from the help section. But I am guessing maybe the 0.2 dB/km attenuation is for the center wavelength (or frequency), and as the frequency changes, the attenuation exceeds the defined value.
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