EDFA

[Ankita Sharma]

Hi all,

Can someone specify the values of different paramaters used in case of EDFA such as system bit rate,Optical Fiber Length,etc ? Also can someone please specify the advantage of using EDFA over simple Optical Amplifier?

Regards
Ankita

[Ankita Sharma]

Also can someone please explain is there a formula to calculate the length of EDFA ?

[Atul Sharma]

Hello Ankita. Greetings from my side.

Well why do you have to calculate the length and what for ? Can you please tell us because its you who decides the length of the fiber you are going to use for your system and it definitely application specific. I hope it gives you some idea.
And as far as the difference is concerned it is the gain and power mode. You can think EDFA as a black box which you may use in your design.

With Regards
Atul Sharma

[nagesh kuknoor]

Hi Ankita,

As everyone has mentioned length of fiber is application dependent. I somehow agree with their responses. You can determine the length as per your need.
Thank you

[SAHIL SINGH]

Hi Ankita,

The advantage of the Optical Amp is that you can explicitly state the gain and noise figure and the model is also much more simple.As far as the values of different paramaters used in case of EDFA such as system bit rate,Optical Fiber Length is concerned it depends on the type of application for which you are designing the system… Hope it helps

Regards
Sahil Singh

[Ankita Sharma]

Hi all,

I have another query Can i simulate the system without Optical Amplifier or EDFA with Fiber Length =50km , Also On which Fiber Length it becomes necessary to use amplifier?

Regards
Ankita

[Atul Sharma]

Hello Ankita. Greetings.

You easily can simulate without amplifier fro 50km. Just take care of other important parameters like input laser power, bit rate and all. What are you exactly designing?

with Regards
Atul Sharma

[jyoti raina]

Hello Ankita Mam..
I agree with sahil Sir that as far as the values of different paramaters used in case of EDFA such as system bit rate or Optical Fiber Length is concerned it application specific..
I hope it helps you to some extent.

With Regards
Jyoti raina

[Ankita Sharma]

Hi all,

Thank you all for your responses particularly Sahil sir and Jyoti…
I really appreciate your concern..

Regards
Ankita

[jyoti raina]

hello ankita mam..
you are welcome its my pleasure..

with regards
jyoti raina

[Ankita Sharma]

Hi Atul Sharma,

I just wanted to know the distance for which my system would work with minimum losses ? I actually had a bit of doubt in my mind… Also thanks for your concern…

Regards
Ankita

[SAHIL SINGH]

Hi Ankita,

You are welcome… Hope you got the desired information…
All the Best
Regards
Sahil Singh

[deepak jha]

Hi all,

Sahil sir has rightly mentioned it that as far as the values of different paramaters used in case of EDFA such as system bit rate,Optical Fiber Length is concerned it depends on the type of application for which you are designing the system…

Thanks and regards

[Remo De Suza]

Hi Ankita.
As far as your query is concerned it is not all about the fiber length. To minimize the error you may have to consider other parameters as well like launching power, laser intensity and other such parameters. I think length should not be an issue as it is application specific as mentioned by others. I hope this will help.

Thanks and regards
Remo

[Domail Singh]

Hello Remo,

Your answer seems to be more apt in this case. This should be really helpful to Ankita.

Regards
Domail

[Ankita Sharma]

Hi Deepak Jha,

Thanks for your reply… I really appreciate your concern
All the best..

Regards
Ankita

[Ankita Sharma]

Hi Remo..

I completely agree that it is not all about the fiber length… I understand that length should not be an issue but I just wanted to clarify about it..

Thanks and regards
Ankita

[Remo De Suza]

Hi Jyoti.
you are welcome. I hope you have got your doubts clear now.
Compared with glasses, for example, semiconductors exhibit much higher refractive indices in their transparency region. For example,

Regards
Remo

[Ankita Sharma]

Hi all,

Thanks for your responses particularly Sahi Sir, Atul Sir and Jyoti Mam… I got my doubt cleared with the help of you all…
Cheeers…

regards
Ankita

[FAYIQA NAQSHBANDI]

HI ANKITA..

As mentioned by other forum members.. The length is definitely application specific..

Regards
FAYIQA

[deepak jha]

Hi Ankita,

You are welcome… and thanks everyone for the information..

Regards

[Kanwarjeet Singh]

Hi Ankita,

I agree with some of the opinions here. You can model your fiber length as per requirement. Hope all the information is helpful for your proceedings.

Regards

[jyoti raina]

hi ankita..
i agree to kanwarjeet sir’s comment..you can do it as suggested by him..

with regards
jyoti

[deepak jha]

Hi Ankita,

I agree with the point put forward by Kanwarjeet that you can model your fiber length as per requirement.. Hope your query gets resolved..

Regards

[nagesh kuknoor]

Hi All,

I think Ankita must have got it now. It will be really helpful for her.

Thank you

[Domail Singh]

Hello All,

I think it is a very valid good discussion here. The points put forth by various members should help Ankita for her design.
Thank you

Regards
Domail

[Ankita Sharma]

Hi all,

Thanks for your responses… Really appreciate your efforts…

Regards
Ankita

[Ankita Sharma]

Hi Domail,

Indeed it is a very nice discussion… Cheers

Regards
Ankita

[Rajguru M. Mohan]

Hi Ankita,
You can set these parameters of EDFA as:
You can also also refer to EDFA sample files of optisystem and check for various parameters in layout.
Signal emission cross section– 3.80×10-25 m2
Fiber radius– 2 μm
Length of EDF— 10,30, & 50m
Pumping power— 10,50,& 100mw
Signal input power— 10 dBm
Signal wavelength— 1552.5 nm
Pump wavelength— 980nm
Er+3 ion density— 1e+025 m-3
We assume the fundamental LP01 mode exciting at the pump wavelength (λp= 980 nm). The gain and Noise Figure can be obtained for all the three pumping configurations as a function of two fundamental fiber parameters namely: fiber length, and pump power. Thus, the required fiber parameters and pump power values can be optimized for a desired EDFA gain-NF performance at 10 and 40 Gbps.

Hope this will help you.

[nagesh kuknoor]

Hello Rajguru,
Thank you for sharing such information. I think this should help Ankita.

Regards

[FAYIQA NAQSHBANDI]

HELLO RAJGURU..

Thank you for this valuable information..This helped me..Thank you again.

Regards

[Manoj Kumar]

Hi Rajguru,

Thanks for the information… Hope it helps Ankita…

Regards

[Ankita Sharma]

Hi Rajguru…

Thank you so much once again for your efforts..

Regards
Ankita

[Rajguru M. Mohan]

Hi nagesh, Manoj and ankita,
You are most welcome.
I will keep posting and sharing latest information on above topic.
EDFA is a very basic element in optical communication.
so, we must its operation .

Regards,
Rajguru

[Ankita Sharma]

Hi Rajguru,

You are free to post the information anytime on the said topic.. Hope to hear from you soon..

Regards
Ankita

[Rahul Tiwari]

Hi Rajguru,

Thanks for the valuable information… Youur efforts are highly appreciated…

Regards
Rahul Tiwari

[deepak jha]

Hi Rahul,

I agree with you… The efforts of Rajguru are worth appreciating..

Regards

[Ankita Sharma]

Hi Rahul,

Thank for your efforts… Really appreciate your time…..

Regards
Ankita

[umer ashraf wani]

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[RAHUL ROY]

Hi,
Erbium-doped fiber amplifiers are the by far most important fiber amplifiers in the context of long-range optical fiber communications; they can efficiently amplify light in the 1.5-μm wavelength region, where telecom fibers have their loss minimum.

A typical setup of a simple erbium-doped fiber amplifier (EDFA) is shown in Figure 1. Its core is the erbium-doped optical fiber, which is typically a single-mode fiber. In the shown case, the active fiber is “pumped” with light from two laser diodes (bidirectional pumping), although unidirectional pumping in the forward or backward direction (co-directional and counter-directional pumping) is also very common. The pump light, which most often has a wavelength around 980 nm and sometimes around 1450 nm, excites the erbium ions (Er3+) into the 4I13/2 state (in the case of 980-nm pumping via 4I11/2), from where they can amplify light in the 1.5-μm wavelength region via stimulated emission back to the ground-state manifold 4I15/2.

[Author]

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