Search Results for 'wdm'

[FAYIQA NAQSHBANDISpectator]

Hi aabid,
well aabid what i understand from the query u have made i presume u can’t stop an optical signal completely from transmission, the signals will be there even if u are able to do so. In case of WDM system which i am presuming u need to implement this logic has in any case all the signals present even after many stages of filtration. What u require is a suppressor ( controller ) which might help u in this case.
thanks and regards

[Tung Tran Van]

I simulate a wdm system using 3R transponders but system performance is so bad ( Q factor ~ 2-3 ) :(( . Should I change what parameters to improve system?
Thanks all.
I attached my project test2.osd.
The 3R transponder structured as shown below.

[TanveerParticipant]

hi ranjeet…
you can refer the below link for Bidirectional WDM-PON system

https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=5&cad=rja&uact=8&ved=0ahUKEwjXgaP4grbLAhUMVI4KHcalCRYQFgg6MAQ&url=http%3A%2F%2Fpnrsolution.org%2FDatacenter%2FVol3%2FIssue2%2F105.pdf&usg=AFQjCNG2s7FFxwT31AyqPZ1tUCQySBxP0w&sig2=8qdxa-sptf7vkm70tZ8QmQ

with regards

[Aabid BabaParticipant]

hello ranjeet,
We are not talking about the fiber bragg grating here but the bandwidth of WDM mux and its effects on the overall performance and performance of the component itself. Please refer to the topic first. I guess you misread the topic but anyway replies and suggestions are always appreciated.

Thanks and regards

[Ranjeet KumarParticipant]

Hi Aabid sir,
I have problem in designing bi-directional OFDM PON , Here i am uploading unidirectional OFDM PON , please suggest or if possible make some necessary changes in it. i want to design it like WDMPON.

[Ranjeet KumarParticipant]

Hi sahil,

If you will use advanced modulation formats like CSRZ, DRZ, MDRZ, DPSK AND QPSK , it will give propagate over larger distance for appreciable Q-factor and minimum BER.
I have designed 8 channel wdm system using different advanced modulation format mentioned above. I think MDRZ IS best of csrz and drz.
Here, i am uploading osd file of WDM SYSTEM USING MDRZ modulation format.
HOPE THIS will help you to understand things more properly.

[SAHIL SINGHParticipant]

Hi Ranjeet kumar,
I am indeed designing a wdm system… Can you please specify which modulation formats cause less BER ?
Thanking you for your earlier responsose…

[Fadil PaloiParticipant]

Hi i am using simple WDM system with all the modulation formats such as NRZ , RZ CSRZ and CRZ allwayes the best MUx/DeMax Bandwidth for the 18 channel system I use 2*Bit-rate which it works perfect

[Ranjeet KumarParticipant]

Hi Sahil,
First you should clear the type of system you are designing and having problem with.
In wdm system, if you increase the power of Laser, the BER and Q-factor will increase, in addition to this if you decrease the bit rate in global parameters the BER and Q-factor may increase, some modulation formats cause less the BER and Q-factor while other give large.

[Ranjeet KumarParticipant]

Hi Gokul,
Many designs are available for OSSB modulation with tunable optical carrier-to-sideband ratio with FBG-based acousto-optic tunable filter,we also Power optimized OSSB modulation to support multi-band OFDM services along hybrid long-reach WDM-PONs and Subcarrier Multiplexed transmission system employing OSSB modulation.
These are the links which may be helpful for you to design.
http://www.sciencedirect.com/science/article/pii/S0030399215001164
http://www.sciencedirect.com/science/article/pii/S1068520015000450
http://ieeexplore.ieee.org/Xplore/defdeny.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fstamp%2Fstamp.jsp%3Ftp%3D%26arnumber%3D4632899%26userType%3Dinst&denyReason=-133&arnumber=4632899&productsMatched=null&userType=inst

[ZULKARNAINParticipant]

Hi gulkaran bajwa…
Well i think you can refer lesson of 16 Optical System Tutorials namely Channel WDM System Design.
This lesson demonstrates the basic features of a typical WDM optical communication system and shows the basic design steps with OptiSystem.
For your reference i am attaching a link which might help you.

16 Channel WDM System Design

Hope that your problem gets solved.

[Aabid BabaParticipant]

Also i would like to mention that OptiSystem component library includes different types of components for WDM systems, the tunable optical filters include Fabry-Perot filters, Mach-Zehnder interferometers, and grating based filters. now it also depends on the design you are designing. I would recommend you to go through the tutorial. I am posting the link. Please refer to it.

WDM Components – Tunable Filters

regards

[TanveerParticipant]

hi Zulkarnain…..
in order to understand about the filters in optiwave you should consult the link where it is already discussed…
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwiGyoqMvrHLAhXRCI4KHcUfDi8QFggpMAI&url=http%3A%2F%2Foptiwave.com%2Fforums%2Ftopic%2Foptical-filters%2F&usg=AFQjCNFUTFquKhAz5qpq0-jlOGd7MRbtHg&sig2=VDq57CqcgTNKd1KJpXDTgw

moreover if you want to understand their usage in optiwave consult this link
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiGyoqMvrHLAhXRCI4KHcUfDi8QFggbMAA&url=http%3A%2F%2Foptiwave.com%2Fresources%2Fapplications-resources%2Foptical-system-lesson-3-optical-systems-wdm-design%2F&usg=AFQjCNF57O1dfMJAajIUgzfWDvMftOtYkw&sig2=FDZzBWJr3E1ngpHYdpOFsA

best regards

[gulkaran bajwa]

hello friends,

I am doing work on equal and unequal channel spacing in WDM network to reduce the effect of Four Wave Mixing using 8 and 16 channel. BUT I have a problem in unequal channel spacing because I am getting distorted signal at receiver side (DEMUX). Please help me out of this problem.

[ZULKARNAINParticipant]

hi ranjeet..
In my opinion the OFDM block position array arranges the position of the central frequency of the OFDM spectra, but please check whether this is true.
For your reference i am attaching few links in which this is discussed which might help you.

wdm-ofdm pon

ofdm ftth network

Optisystem OFDM Block

OFDM