fiber looping

HELLO JYOTI
The use of the loop control is to control the amount of laps on a circuit involving a fiber and a amplifier for example, it is easier to control the dispersion and prevents unnecessary usage of many amplifiers for many large distances…I would suggest you to go through the design which shown in the link i am posting…it makes use of loop control..

Dispersion Compensation Schemes – A System Perspective

Can u upload ur osd file
Thanks and regards

Hi Jyoti,
I agree with you that using number of loops for fiber is not equivalent to its equivalent fiber size in terms of BER and Q-factor, but i think not very much difference occurs. It is because when we multiply size of SMF and DCF we have to change its parameters. But when we use no. of loops , its configuration remains unchanged and hence we get different results.

it is easier to control the dispersion and prevents unnecessary usage of many amplifiers for many large distances…I would suggest you to go through the design which shown in the link i am posting…it makes use of loop control..

Hello jyoti,
All have rightly mentioned that what prime purposed of loop control are and what for you should use it. As far as your query is concerned , there could be various reasons why your two results are varying. I suggest you to first set alike parameters for every component you are using in your system design. Also try to disable the ‘generate seed’ option. logically , the results should not vary much. I hope you implement all these things and check for the results.
Regards

Hi Jyoti Raina..

Well the generate random seed option has got to be disabled so that your results stay consistent. Whenever you open component properties of a component, you would find a tab ‘random numbers’ in properties of some components, there you should disable the generate seed option. This way your results would always remain same no matter how many times you simulate provided all the parameters remain same. I hope it helps.

Regards.

HI JYOTI..
I agree with aabid..The first thing you must keep in mind is keeping the system parameters same for for both cases and also disabling the generate random seed option..As naazira has mentioned correctly that it leads to variation of results in most of the cases..you try these things and hopefully your results will not vary and there won’t be huge difference between the two cases..
thanks and regards
Fayiqa

Hi Jyoti Raina..

You could double click on a component. A properties window would open having many tabs like Main, Simulation . ‘random numbers’ would be one of the tabs. You can disable it there.

As far as BER performance is concerned, it would always be different if seed is kept enabled, but no specific trend can be seen, as in whether it would increase or decrease. I hope I am clear.

Regards.

Hi Jyoti raina

As far as loops are concerned there are few links i am posting that might help u and regarding variation i would suggest u to disable random seed as suggested by all by double clicking on every possible components and you might find a random seed option that u need to uncheck that to disable random seed.

Lesson 3: Optical Systems — WDM Design

why use loop control in circuit

Regards

Burhan

Hi Jyoti Raina

Ohhhh here i found one more link infact a pdf that might give u a better insight of the optical loops. I hope it helps

https://cdn.optiwave.com/wp-content/uploads/2014/10/26162826/1_2171.pdf

Regards

Burhan

Hi Jyoti,
First i accept your thanks in advance.
I was discussing that using number of loops for fiber is not equivalent to its equivalent fiber size in terms of BER and Q-factor, but i think not very much difference occurs. It is because when we multiply size of SMF and DCF we have to change its parameters. But when we use no. of loops , its configuration remains unchanged and hence we get different results. for more explanation i am attaching osd file in which we use symmetrical compensation techniques (DCF+SMF+DCF)….. IF WE change the the length of fiber (DCF, SMF) independently change the length of fiber, we have to change its internal parameters but when change the no of loops the length of fiber increases without changing the internal parameters.

Hi Ranjeet,

I agree with your view that using number of loops for fiber is not equivalent to its equivalent fiber size in terms of BER and Q-factor.. You have expained the concept very beautifully… Thanks for your efforts

Regards
Sahil Singh

hi all,

the problem is to how to repeat the same trsnamission link again and again , which in other terms is called as fiber looping..

in optisytem we have the provision to repeat the same fiber link again and again using loop compononent. after using the loop compomponent you edit no. of loops there.
with the use of iteration, can view the performance analysis right from the first loop.
suppose you want to evaluate the system perform with one loop to 10 loops for same transmission link…you can put iteration values there.and simulste the .osd file.
you can get graphs which value with loop no. 1 to 10..

hope this is help full

with regards

Hi Jyoti raina

You are welcome. I want to clearify the confusion you have regarding me being male or female.. I would suggest you to check my profile to confirm that i am female and hence should be called madam rather than sir.. Haha this is really humorous of you to refer me as sir ..

Regards

Burhan

hi burhann madam,
i think during one is intersested in answer to his solution not the the person is male or female…and besides one can not check every persons profile during discussion
with regard

Hi Aasif Bashir

Well let me be clear that this comment of you is quite offensive. If one cannot get the gender from the name then one should use the name only rather than using madam or sir. Well it was just for the sake of interacting with jyoti. Nothing was there to let her down or specifying my gender. N i think the response should have been from her not you. I mentioned it by the way as i myself laughed on this . Well if jyoti felt bad i am sorry in advance.

Regards

Burhan

no issues from here,,
hope the jyoti had got the solution to her problem..

i want to mention that the in the TOOL library in optisytem… there is component named LOOP CONTROL>>>Allows you to build systems using loop structures

The loop topology starts at the Loop output port and terminates at the Loop input port. The signal enters the Input port and circulates in the loop N times, where N is defined by the parameter Number of Loops

hope now you have no problem in looping the signal

with regards

Hi all,

We shoould make it sure that we do not get offensive here on any issue… Such things create a bad impression of the forum and divulge from its primary purpose… Anyways let us forget it once and for all.. Further i agree with asif that in the TOOL library in optisytem there is acomponent named LOOP CONTROL which allows you to build systems using loop structures… Hope the query is resolved..

Regards
Sahil Singh

you are welcome joyti raina..and happy that you got got your query fixid