May 14, 2015 at 9:53 am #20811
What are the best of effective area in optical fiber ?
Ibrahim luay al baity
May 15, 2015 at 4:19 am #20828Abhishek ShramaParticipant
Effective area of optical fiber is a area over which E field(electric) is distributed.In case of optical fiber (Smf) A eff is ,what intensity of light or how much energy fiber carry without introducing non linear effects.Calculation of non linear phase shift can done using this
φ=2π/Λ n2 P/Aeff L
Where φ phase change due to non linearity
Λ is a wavelength
n2 non-linear coefficient
Aeff Effective area
As effective area increase ,more phase change,more will be the linearities.You can use the fiber with low Aeff+2
May 15, 2015 at 7:16 am #20835
There is no univoque answer, it depends on the applications. Lower Aeff means more nonlinearities, which is helpful if you want to use Raman gain (less pump power required if Aeff is low), but limits launch power due to SPM/XPM/Brilluoin. Instead, higher Aeff requires more power from Raman pumps, but you can launch more from the transmitters.
As usual, there is a tradeoff between different factors so the best fiber depends on your system!+3
May 15, 2015 at 10:46 pm #20851Ajay VyasParticipant
Thanks to both of you for the valuable answer. I want know when we increase the power of laser or length of fiber the nonlinearity will be increase than how we calculate or observed the order of nonlinearity.
May 15, 2015 at 10:50 pm #20852
I agree with the definitions and explanations given by Abhishek. The reasoning elaborated by Alessandro is quite informative: there is a trade-off between the amount of power you want to launch in your system and the requirements to nonlinearities that you have. Since the requirements for effective area are highly dependent on your design, please, let us know what kind do you have so we can give you more specified answer for your case (if you would like).
May 17, 2015 at 1:39 pm #20879
Mr. Ravil my project is incoherent OCDMA
May 18, 2015 at 2:04 am #20882
Are you using EDFAs only, or also Raman pumps and ROPAs in your design?
May 18, 2015 at 9:35 am #20887Ashu vermaParticipant
Thank you Abhishek for describing the concept.As SPM and XPM are phase dependent,it is very important to study the effective area.Also Alessandro gave good points also .
May 18, 2015 at 1:21 pm #20898
Dear Mr Alessandro
I am use EDFA in my project
May 18, 2015 at 6:25 pm #20903
If you are using EDFA in your scheme and you are not taking advantage of non-linearities of any kind, it would be beneficially for you to use fibers with larger effective area. At the same time, you will be able to increase the power from transmitters without getting any non-linear responses or decrease the influence of non-linearities for a given power level at the transmitters. However, the presence of non-linearities can be used for dispersion compensation…
May 19, 2015 at 2:07 am #20920
I agree with Ravil. Also his last point is interesting: nonlinearity interacts with dispersion, so that optimal residual dispersion for a given transmitter depends on the amount of SPM (and so depends on Aeff) that happens in the fiber.
May 27, 2015 at 10:21 am #21208
May 28, 2015 at 3:37 pm #21227
You are welcome albaity! Let me know if you have any further questions.
Dear Alessandro, saying that I just wanted to highlight the relation of SPM and residual dispersion. This relation, as we know, can be used for compensation techniques…
May 29, 2015 at 1:59 am #21237
Hi Ravil, yes, I understand your point 🙂
April 20, 2016 at 9:38 am #38381Fadil PaloiParticipant
please can any one tell me how can I calculate the effective area of the SMF and DCF is there any equation or other way to calculate, I have SMF(Dispersion=16, D.Slop=0.08 and Effective area of 93 um^2, how can i get effective area of DCF (Dispersion=-80, D.Slop=0.26) how can I calculate Effective area for the DCF, Thanks
April 20, 2016 at 1:54 pm #38384raja irfanParticipant
Just like conventional SMF transmission, the performance of weakly
coupled MCF transmission is also constrained by the nonlinear
interference (NLI) noise, especially for long-haul transmission
using advanced modulation formats. Thus, it is logical to increase
effective area of individual core. However, there exists
random crosstalk between adjacent cores during MCF transmission
April 20, 2016 at 2:40 pm #38405Rajguru M. MohanParticipant
As the effective area of the fundamental mode is a measure of the area over which the energy in the electric field is distributed.
This parameter is important for DWDM applications.
We know the effective area of a single mode optical fiber is obtained by this relation :
A eff= pi * W2( lambda )
Typical single-mode fibers, as used e.g. for optical fiber communications,
have effective mode areas of the order of 100 μm2.
Large mode area fibers have several times higher mode areas, sometimes even above 1000 μm2.
On the other hand, there are some photonic crystal fibers with mode areas below 10 μm2.
According to optiwave component library pdf file the effective area of fiber is chosen to 80 μm2.
And it is fixed defaukt value.
I think this value is best.
Seeking your response.+2
May 4, 2016 at 6:32 am #38827umer ashraf waniParticipant
also read about V no
May 4, 2016 at 11:04 am #38832Hamza Ali Abbas KhanParticipant
I want to add that similar to Mode Field Diameter(MFD), the effective area of the fundamental mode is a measure of the area over which the energy in the electric field is distributed.
effective area in a single mode optical fiber determines how much energy the core can can carry without causing non-linear type signal losses. This parameter is important for DWDM applications.
Whilst the effective area characteristics are frozen at the time of manufacture and as such are fixed for the life of the fiber, it is a parameter that is influenced by various properties within the fiber that do vary along its length, so it is useful to measure the effective area even within a cable manufacturing environment to ensure the consistency of the product.
Hope it helps.
May 5, 2016 at 4:46 am #38874Karan AhujaSpectator
Effective area is another term describing the Mode Field Diameter (MFD), and it has a direct impact on the non-linear effects, those depends directly on the power density of the light injected into the fiber, i.e. the larger the effective area or (MFD), the lower the power density and so the lower impact of non-linear effects, and the smaller the effective area or (MFD), the higher the power density which leads to higher impact of the non-linear effects.
The effective area of a standard singlemode fiber is about 80um, and can be as low as 30um for compensating fiber. the effective area is sometimes included in the description of the fiber name, such as Corning`s LEAF (Large Effective Area Fiber.
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