- This topic has 6 replies, 5 voices, and was last updated 8 years, 5 months ago by
Hamza Ali Abbas Khan.
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April 15, 2016 at 6:27 am #36804
Gede TeguhParticipantHi guys,
I am having problem with BER and Q Factor in DWDM system with Radio over Fiber.
I have designed DWDM system with 4 channels.
Following parameters used are 1-10 gbps bit rate, variable transmission length.
When i used 622 mbps bit rate, i get good BER < 1e-09 and Factor Q >6 . But when i try to use 1-10 Gbps bit rate, BER Analyzer cannot detect it ( BER : 1 , Factor Q : 0 )
How could i get good BER and Factor Q with 1-10 gbps bit rate?
Suggest me some ways so that i could get the expected results.Seeking your response. Thank you guys
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April 18, 2016 at 11:09 am #38179Gede TeguhParticipant
Help me guys
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April 18, 2016 at 11:50 am #38183
Rajguru M. MohanParticipantHi Gede Teguh,
So, you have already said that you are trying to increase the bit rate and you are finding difficulties.
I suggest you to use advanced modulation formats like CSRZ, DRZ and MDRZ and DPSk because these supports both long haul transmission and high data rate.
As we know that The use of Dense Wavelength Division Multiplexing
WDM system is responding to the demands for high
data rate applications and reasonable mobility for broadband communication.
It is easy to see that the dispersion become
the major factor that restricts long distance fiberoptical
transfers as the bit rate increases . so, you must use dispersion compensation techniques to mitigate dispersion.
You should use Pre, post or symmetrical dispersion compensation techniques to achieve above goals.
dispersion
compensation is achieved with DCF using postcompensation.
Post -compensation scheme achieve
dispersion compensation by place the DCF after a
certain conventional single-mode fiber.. EDFA is
used to compensate the power loss generating by
SMF and the DCF signal. Three EDFAs are used in
the system as a power amplifier, inline amplifier and
preamplifier.Hope it will works for you.
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June 11, 2016 at 1:53 am #39914
Hamza Ali Abbas KhanParticipantHello.
As far as your query is concerned it has been rightly mentioned by Mr Rajguru that you use advanced modulation formats like CSRZ, DRZ and MDRZ and DPSk because these supports both long haul transmission and high data rate.
You may go through these.
http://www.inase.org/library/2014/interlaken/bypaper/COSICO/COSICO-30.pdf
http://www.ijettjournal.org/volume-17/number-10/IJETT-V17P292.pdf
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5689024&abstractAccess=no&userType=inst
http://www.inase.org/library/2014/interlaken/bypaper/COSICO/COSICO-30.pdf
http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D6210761%26userType%3Dinst&denyReason=-133&arnuI hope this will help.
Thanks
Regards
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April 18, 2016 at 12:02 pm #38184Rajguru M. MohanParticipant
In addition to above points i would like to suggest links regarding DWDM +ROF system.
http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5689024&abstractAccess=no&userType=inst
http://www.inase.org/library/2014/interlaken/bypaper/COSICO/COSICO-30.pdf
http://www.ijettjournal.org/volume-17/number-10/IJETT-V17P292.pdf
http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D6210761%26userType%3Dinst&denyReason=-133&arnumber=6210761&productsMatched=null&userType=inst
You have talked about ROF without OADM, it means you are using WDM mux and demux.
Here i am uploading the osd file of 8 channel wdm system with 100 ghz channel spacing and using symmetrical compensation with CSRZ modulation formats for your reference.-
April 18, 2016 at 4:07 pm #38220
FAYIQA NAQSHBANDISpectatorHI GEDE..
Can’t open your file right now.. Are you talking of upstream or downstream? Please confirm.
Regards
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April 18, 2016 at 3:15 pm #38213
Ankita SharmaParticipantHi all,
Thanks for the information and the links.. Really appreciate your efforts….
Regards
Ankita Sharma
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