FBG reflected spectrum

(joined April 2015)

Participant

Hello, why FBG keeps reflecting a part of the transmitted spectrum (which is supposed to be transmitted and not to appear in the reflected spectrum) when use it with CW laser? For example, in the case of CW wavelength is 1550 nm, and the FBG reference wavelength is 1551nm, the reflected spectrum from the FBG displayed in the OSA contains both of 1550 and 1551 in the same spectrum, what ever the FBG bandwidth is.
. Thank you

Responses (10):

May 17, 2015 at 2:50 am #20877

Mohamed Elgaud
Participant

Hello, why FBG keeps reflecting a part of the transmitted spectrum (which is supposed to be transmitted and not to appear in the reflected spectrum) when use it with CW laser? For example, in the case of CW wavelength is 1550 nm, and the FBG reference wavelength is 1551nm, the reflected spectrum from the FBG displayed in the OSA contains both of 1550 and 1551 in the same spectrum, what ever the FBG bandwidth is.
. Thank you
May 18, 2015 at 10:05 am #20889

Ashu verma
Participant

A fiber Bragg grating is perturbation of refrective index in fiber core (may it periodic or non periodic)which reflect specific wavelength and transmit other.When ligth reflects from FBG it contains other frequencies also as you said,then try ideal FBG to simulate this. Bandwidth of FBG we take 3 times the data rate .
e.g
Data rate= 10Gbps then FBG BW is 30Ghz
Hope it helps you
And can you share your objective,if it would be possible.So that we can help you more
Regards

+3
May 18, 2015 at 7:13 pm #20909

Ravil
Participant

Hi Mohamed,

I agree with Sam Sung that ideal FBG might work better for you. At the same time, can you, please, specify/clarify a few things about your question: what kind of FBG you have used in your scheme and what are the powers of the other reflected wavelengths? Please, attach your scheme as well if you can. It will help us to understand your project better…

+1
June 29, 2015 at 12:48 pm #21995

Mohamed Elgaud
Participant

Thank you very much guys, sorry for late replay, will attach the scheme soon and get your appreciated help.
- July 1, 2015 at 11:07 pm #22066
  
  Ravil
  Participant
  
  You are welcome, Mohamed. As a forum member, I am glad to give you my advice when I can. I hope you have solved your issue by now!
June 30, 2015 at 1:55 am #22007

Taiwo Ambali Abiola
Participant

But which of the two FBGs is the one available in the market. Is it Ideal or Uniform FBG?. Or they are both available in the market?.

Thanks
June 30, 2015 at 2:11 am #22008

Alessandro Festa
Participant

The ideal is the perfect component to use for dispersion compensation. Being ideal, it is not really a commercial component, but the Dispersion Compensation Modules you find now on the market are very similar to that.

+1
June 30, 2015 at 4:38 am #22010

Ashu verma
Participant

Welcome Mohamed,best of luck for the research.Any doubt share with forum members,you will surely get help.
Hello Taiwo
I am agree with Alessandro about the ideal FBG. FBG’s now available in market are close to ideal one,but cannot say these are ideal.As small losses are in every component.
June 30, 2015 at 4:51 am #22016

Taiwo Ambali Abiola
Participant

Ok, thanks alot both Alessandro and Sam sung
June 30, 2015 at 4:56 am #22018

Alessandro Festa
Participant

You are welcome Taiwo!
June 30, 2015 at 11:52 pm #22040

Ashu verma
Participant

Welcome Taiwo,Best of luck for your future research.

FBG reflected spectrum

Responses (10):

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