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In reply to: loop control
Very well explained. I would also like to add there might be a question on why the need for control loop instead of increasing the length of the fiber component. In optical fiber communication, components such as amplifiers are usually used with a constant distance from one another in the link. So using control loop you wouldn’t need to use all the components used in some part of the link over and over in series.
In reply to: loop control
loop control provides an efficient mechanism to increase or decrease the channel length on optical fiber communication.
for example the loop no.= 0,then the length is zero
simmlarly if loop n0.=8 then length is increased by eight foldTopic: loop control
Topic: Optical buffer design
In reply to: problem in BER analyser
Hi! Asif
Your system works fine and you made it by considering all the technical values needs to set for the several components such as Fbg,Edfa etc.The only thing i have corrected is just inserted a loop control for you each transmission subsystem consisting of smf ,,fbg and edfa.your system gives Ber of 10^-10 after 8 loops which distance is equal to the subsystems attachrd by you.Now one loop consisting of smf 100 km edfa 20 dB and smf then FBG.
Check the attached fileIn reply to: Plz help me to solve 3 questions
1) You can use an optical delay or an initial delay. There is also an Optical Ring Controller which will control how many times the signal propagates in the ring.
2) Yes the signal index changes which iteration of the loop you are investigating.
3) Not exactly the case every time for every project. You can check to see how many iterations it takes for the first output to arrive at the Power Splitter and then every iteration after that will be one loop. In this case I am getting the 0th iteration arriving at the output, so yes the iteration corresponds to the number of loops. In some cases, like using an Initial Delay this might be different.In reply to: Transcient responce of HOA
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…
In reply to: Please someone help: Problem with Feed back loop
I forgot to explain the Initializer in my previous post. It is really the key component along with the Optical Ring Controller.
The Initializer allows you to start a ring simulation with an initial field, in subsequent iterations it will propagate the optical signal around the loop indefinitely. That is unless of course you use a Optical Ring Controller, which will tell the simulator to stop the calculation after a number of loops. There is also a convergence tool you can use that will stop the simulation when the signal reaches steady state, however in this case the signal is constantly changing, so I chose to control the number of loops explicitly.
Regards
In reply to: Loop control
Thank You DAmian ,I will try using CUDA in latest version of OPtisystem.But please analyze this system ,so that loop control with HOA will start working.Can you please suggest the changes in optical fiber so that it will take less time to calculate.
In reply to: Loop control
Thank you Damian ,here i am attaching my system file ,also please check system takes too much time to simulate(power is high after amplifier)Raman fiber simulate for 10-15 minutes.And in this system i have used 10-12 raman fibers .Please suggest me changes to simulate it fast as well as loop control.
Topic: Loop control
@ damian
Hello!!
Why is such that some components do not run in loop control. I tried to put ED fiber and also HOA in Loop but it doesnot work. Why so and can this problem be solved. How? i also tried it by splitting fiber into symmetric parts and incorporating the ED fiber and Hybrid optical amplifier as:
SMF- HOA- SMF
but still the output doesnot come. If i attach the same without loop control as SMF-HOA-SMF-HOA-SMF-HOA then even at greater lengths it works. but not only in loop. Why?
Please resolve the issue as soon as possibleIn reply to: why use loop control in circuit
The use of the loop control is to control the amount of laps on a circuit involving a fiber and a aplificador for example, it is easier to control the dispersion and prevents unnecessary usage of many amplifiers for many large distances.
In reply to: why use loop control in circuit
hi,
thanks for you.
this a link which use a loop control but if i need to design an optical system with dispersion conpensation ( with loop control) without use an amplifier, its true or false?
best regardsIn reply to: why use loop control in circuit
the loop is used in the system if u are using the components like amplifiers in ur setup
eg. if u r using an amplifier and u are using a loop control with it, and keep the no. of loops as 3. that means u r amplifing ur signal 3 times
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