DWDM + RoF System Bit Rate

[Gede Teguh]

Hi 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

[Gede Teguh]

Help me guys

[Rajguru M. Mohan]

Hi 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.

[Hamza Ali Abbas Khan]

Hello.
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&arnu

I hope this will help.
Thanks
Regards

[Rajguru M. Mohan]

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.

[FAYIQA NAQSHBANDI]

HI GEDE..

Can’t open your file right now.. Are you talking of upstream or downstream? Please confirm.

Regards

[Ankita Sharma]

Hi all,

Thanks for the information and the links.. Really appreciate your efforts….

Regards
Ankita Sharma

[Author]

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