- This topic has 19 replies, 5 voices, and was last updated 9 years, 4 months ago by
Abhishek Shrama.
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June 26, 2015 at 4:02 am #21930
Abhishek ShramaParticipant@damian ravil
Hello
Please inform me that how to check transient response of hybrid optical amplifier. I have tried it using OTDV by adding and dropping channel but couldnot find a way to check response.
I am attaching the link to research which I am following.https://www.osapublishing.org/jot/abstract.cfm?uri=jot-81-10-590
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June 26, 2015 at 9:25 am #21941
Damian Marek
ParticipantAre you using the dynamic model of the EDFA?
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June 26, 2015 at 1:06 pm #21949
Ravil
ParticipantHi Abhishek,
Unfortunately, I don’t have an access to the article with the link that you’ve provided. Can you, please, share the scheme (with appropriate citations according to regulations) that you are working on? Did you try to obtain/measure a power/energy spectrum at the input and at the output of your amplifier? It is known that transient response of any amplifier is equal to the ratio of the output voltage (in case of electrical signal)/power to the input voltage/power…
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June 27, 2015 at 1:19 am #21957Abhishek ShramaParticipant
Thank you damian for your reply,i do not understand which model i have to use whether it is dynamic or ARA in case of raman amplifier and EDFA. I have attached a file ,please look at this.
Ravil thank you too,I have one more problem,when i use this system in optisysyetm 7,noise figure at the dual port analyzer comes out to be 4db and less than that.But same systeem in optisystem 13 gives >50 db NF.Why it is so? -
June 27, 2015 at 1:23 am #21960Abhishek ShramaParticipant
Fiber bragg garting i have used to reflect pump is take so much time for calculation,do i have to change max. no of iterations? When i once changed the max. no of itreations in case of EDFA,gain of the sysytem drop downs to lower values
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June 28, 2015 at 3:38 pm #21975Participant
Hi Abhishek,
Unfortunately, I don’t have an access to OptiSystem right now to run your schemes. However, according to your question about the choice of amplifier (Raman & EDFA) I would recommend you to take a look at the following link (if you have not seen it yet): http://www.researchgate.net/profile/Juliano_De_Oliveira/publication/257362781_Hybrid_Distributed_RamanEDFA_Amplifier_with_Hybrid_Automatic_Gain_Control_for_Reconfigurable_WDM_Optical_Networks/links/0c960525063b2dc5dc000000.pdf
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June 28, 2015 at 3:41 pm #21976Participant
It looks like the final choice of amplifier depends on your requirements: EDFA can achieve higher gain with the use of control loop, distributed Raman amplifier can have less noice with the proper gain control. I hope it will give you some ideas…
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June 29, 2015 at 5:57 am #21984Abhishek ShramaParticipant
Hello Ravil and damian
Here i am attaching a file from optisystem 7 on the project i am working on.I have problem to plot graph .In optisystem RA DYNAMICS grapgh is different as compared to my graph.i just want to know how to set the values to get a graph as in example.see the attached graphs
First graph is from optisystem samples while 2nd one is of my system. -
June 29, 2015 at 6:00 am #21985Abhishek ShramaParticipant
screen sh0ts
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July 5, 2015 at 11:40 am #22180
Ashu vermaParticipantHello everyone
This topis is on the transcience response of amplifiers ,as i havnt much knolwlegde about the topic.But i have a common question about EDFa core radius and ions dopic radius.In some of the samples both in optisystem 7 and optisystem 13 values taken 1um ,1um sometimes and 2.2,2.2 in most of the cases in older version.Also i have seen value 3.2 also.Value of Numerical aperture is 0.24 and 0.31 some of the cases.what are the default values of these parameters in case of Edfa.if i use values 3.2 ym then is it practically feasible or what edfa with what values is available commercially.-
July 6, 2015 at 10:03 am #22193
Alessandro Festa
ParticipantHi Sam Sung, that depends on the type of fiber and amplifier. I suggest you open a new topic to discuss this item.
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July 6, 2015 at 10:34 am #22199Ashu vermaParticipant
Thank you Alessandro
I think in most of the cases ,different core radius used for gain flattening and access of more light into the doped fiber.But i would like to know some certain values and specification of EDFA.Yes i will start this topic for more understanding.Thank you fo your quick reply.-
July 6, 2015 at 12:00 pm #22204Participant
EDFA companies (like mine 🙂 do not share details on the geometry of the fiber…you need to look at vendors of fiber themselves to know these details.
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July 7, 2015 at 9:48 am #22224Ashu vermaParticipant
Thank you Alessandro (Lolz),I was not aware of this thing.I was just looking for the some specification of EDFA,which are default and can be used as it is.Rest there are many values and i have gone through many papers where they can used different core radius numerical aperture for high gain and gain flatness.Optiwave itself used different parameters in their systems too.So now if i will going to study the EDFA through simulation then i can use any of the values since there are no typical values .isn’t it?
Case of RAMAN fiber amplifier is also smiler to this.Once again thank you for the rply-
July 7, 2015 at 10:16 am #22225Participant
Using any value is not a good idea since you could come up with results for efficiency/noise figure/flatness which are not realistic.
I think the best in this case is to use “Optical Amplifier” component.
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July 9, 2015 at 7:14 am #22286Abhishek ShramaParticipant
@Damian,Please suggest me the way to correct the transience of attached system.I have attache two graphs ,but graphs are different .do i missing some factor or adjustments to take a right graph? Thanks in advance
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July 9, 2015 at 1:48 pm #22295Participant
I can’t help you directly in OptiSystem 7 version files, because any file I attach will not be able to be opened by you and also because that version is quite old and I am not sure of all the changes that have been made since then!
That being said I can see that you are using the Average Power Model in your design, when you need to use the Raman Amplifier – Dynamic Model.
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July 10, 2015 at 12:27 am #22300Abhishek ShramaParticipant
Hello Damian,I also have optisystem 13.I have tried the system with DYN model of Raman fiber amplifier too.But couldnt get exact results as shown in optiwave example.You make correction in the file using latest version ,i have access to the software.So please help
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July 10, 2015 at 9:23 am #22318Participant
I just copy and pasted the example file into yours and it works fine. All you need to do is change the bit rate so that the time window is large enough.
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July 15, 2015 at 6:57 am #22449Abhishek ShramaParticipant
Thankyou Damian!!
You are always so very helpful and finally the one to solve issues
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