Search Results for 'wdm'

[Dr. Dhiman KakatiParticipant]

Hi Burhan,
you are most welcome, I think, This should definitely work, just 2days before I tried another system from 16 channel I made it 4 channel. and let me know if you face any further issue. how much is your wavelength spacing at the transmitter side. and one more thing you try to make the spectrum at the WDM MUX output.

Regards,
Dhiman

[Dr. Dhiman KakatiParticipant]

Hello burhan num mina llah,
All you need to do is as follows:

keep all the bandwidth constant as previous,

check the CW laser array for frequency and power (keep power sweep mode as previously), Check frequency (or wavelength) range and set the middle frequency (among all the generated light frequencies) as the single mode fiber (SMF) and for also dispersion compensating fiber (DCF) at the properties of the fiber.

check power at different positions such as at the WDM mux output, after SMF, after DCF and after the WDM demux, dont let it go high or to low below a certain level.

Thats all you need to do and you will get a better output in terms of constellation and Eye diagram, BER.

Regards,
Dhiman

[burhan num mina llah]

Hello all

I tried to copy the existing example of 32 channel DWDM system system for only 4 channels and kept all the characteristics similar to those mentioned in the example itself.. But I don’t get any result at the output. Can anybody please help me with it..

[Nguyen Hai HaParticipant]

Hi aabid and aasif, thank for your comment as i said i try to do analyse Performance on single channel transmission of ng pon2 with some impairment: antenuation, Cd, non linear,…base on my attached file, in my attached file, they use 40gb upstream( 4 pair wavelenght 10gbps) and 10gb downstreem. But i still want to build a TWDM 10gbps upstream(4×2.5gbps) and 2.5 gbps downstream, in addition, i dont know how to use optisystem to show diagram same figure 27 in my attached file.

[Aabid BabaParticipant]

Hello Nguyen,
Why do you need a TWDM ?
Regards

[SAHIL SINGHParticipant]

Hi Burhan,

You are correct in mentioning that in WDM system section of the optisystem 14 there is an example of COADM there it is clearly shown how add, drop modules are used… Thanks for the information..

Regards
Sahil Singh

[burhan num mina llahParticipant]

Hi Aabid Baba

I believe you would be well aware of the theory and basics behind add module, drop module or add/drop multiplexer but since you want to know about the use of these modules in some example that would be existing in the examples. I have myself come across an example in which these modules were used . In examples of optisystem 14 go in the WDM system section and in there u would find an example of COADM and in that u will find that how add, drop modules are used. See for them if u find them well and good if not mention it i will upload the .osd file for you in that case.

Regards

Burhan

[Nguyen Hai HaParticipant]

Hi aasif, i still only designed Gpon before, thank a lot your attach files, do you have similar TWDM system like my attached file?Thanks

[SAHIL SINGHParticipant]

Hi all,

I agree with the view points of asif that the drop module is simlar to that of the add mux in technical back ground however..it Drops a WDM channel from a WDM signal. Also as pointed out by Atul Sharma could anyone explain what depth of the filter means and what impact does it have on the design…

with regards
Sahil singh

[jyoti raina]

hi evry1 plz have a look at this signal..i am designing a 4 channel wdm system..i initially hd problm with the signal after the mux bt the problm was solved bt nw my problm is at the filter m using at d receivr side…
i do nt get anthing clr frm this..i increased d power to c if anythng happens bt stil the signal is same..plz tel me what shud i do to get four wavelengths vth sme power level..
thanx in advance

[Aabid BabaParticipant]

Hello atul Sharma,
I agree with fayiqa that we can easily replace a power combiner with a circulator but i think there maybe difference in results though because using a circulator does affect your results. Normally it is true that the circulator is used for adding and dropping wavelengths and in that process the results do get affected and moreover it you check the power levels after the circulator you will find the power level drops just in case of the WDM Mux. fayiqa has suggested you the right thing.
Regards

[SAHIL SINGHParticipant]

Hi Atul Sharma,

The compents combiner,optical circulator and WDM ADD are used for performing different functions… It has already been very well explained by aasif the uses of these three components in the previous post…

Regards
Sahil Singh

[aasif bashir darParticipant]

hi fady
In order to realize bidirectional ofdm system first you need to make a system using bidirectional fiber by placing ofdm transmitter and receiver on both sides .However working of bidirectional fiber in bidirectional system is little tricky ,you need to add null signals for upstream tx signals.Here are some examples of bidirectinal fiber and working

Lesson 5: Bidirectional Simulation — Working with Multiple Iterations

Use of BD in Bpon is given in this link

Broadband Optical System Based on a Passive Optical Network (BPON)

Try designing system by taking one Tx and Rx on both sides and if it works try to increase them.Let us know if our information helps and share your base paper or reference content you wish to reproduce for better information.

you query is related to issue, which has been already in discussion in past…

Bidirectional OFDM system

Bidirectional WDM OFDM PON

even ne was post by you also

i also appreciat fayiqa for uploading .osd file
with regards

[FAYIQA NAQSHBANDISpectator]

HELLO ATUL SHARMA..

In my opinion you can easily replace a power combiner with a circulator but i think there maybe difference in results though because using a circulator does affect your results…
Normally i have seen the circulator for adding and dropping wavelengths and in that process the results do get affected and moreover it you check the power levels after the circulator you will find the power level drops just in case of the WDM Mux..Still you can cross check by using it in place of power combiner and check for the results..

Thanks & regards

[Atul SharmaParticipant]

Hello Umer Syed. Good Afternoon and greetings from my side.

Well i think you have not read the question properly. You are posting something that can be googled too and is known already. Your reply is very irrelevant to this query and if you try to understand the query i am asking about the major difference between three components that are power combiner, circulator and WDM add component ,which all are passive. You are replying something that is more relevant in field of EMT as aasif bashir already mentioned. Anyways thank you for your anticipation.

Regards
Atul Sharma