Search Results for 'wdm'

[Aabid BabaParticipant]

Yes burhan num mina llah,
I feel a component should be in cooperated in the component library which could directly calculate delay associated with the component just like as power meters and WDM analyzers. Though problem remains about calculating overall speed of the network and it continue to remain so unless and until a mathematical model can be developed to do so. Hope somewhere down the line , we see it.
regards

[gulkaran bajwaParticipant]

Thanks aabid it works but Q factor drops from 60 to 2.5 aprox for 40gbps
i have some queries
1. In this TWDM PON (NGPON2) with 40gbps down and 10 gbps up we have to use only 1:64 splitter only or we can reduce as per our requirements?
2. where should i put amplifier for gain( mean to say before it fed to fiber or with fiber) and which one works better in bidirectional fiber except raman amplifier with pump laser?
3. As per NGPON2 standards it provide service to 128 ONUs acc to my info so how we use the combination of splitter like first use 1:8 splitter then with its first slot use 1:16 splitter or just use one splitter any of them (i am using only 4ONUs)
THanks BRo

[Aabid BabaParticipant]

hi gulkaran,
You are doing it right. In the downstream are you using AWG bidirectional Mux/Demux?
I suggest you to use simple WDM MUx/Demux separately for your upstream and downstream respectively and try using fabry parrot filters in the optical domain instead of low pass bessel filters. Also try to use Optical amplifiers with gain output. I hope it will help.

Regards

[gulkaran bajwaParticipant]

hi alistu,

I am confused about what should i add in downstream of TWDM so that it can handle 40gbps if i use to increase bit rate above 2.5 gbps it starts distorting output

[FAYIQA NAQSHBANDISpectator]

Hi Aabid

Since the question was asked for calculatinjg the power budget of WDM PON systems so my answer was specific to the particular systems.For other systems the formula might vary a bit but generaly for any system power budget is the difference between the transmitted power and the power level measured at the reciever end ( Reciever Sensitivity).

And for calculating the loss of each component check table 11.2 in the link i am posting.

http://ops.fhwa.dot.gov/publications/telecomm_handbook/chapter11.htm

Hope its helpful

Regards

[Aabid BabaParticipant]

Hello Alistu,
I just asked about it to be sure if there are anyway. No doubt, the osd files here indeed are very very helpful for researchers.
I hope in next updated sample files we find a few examples on TWDM systems as well. It will definitely be very helpful.
Thank you anyways.
regards

[alistuParticipant]

Hi Aabid,

There are no examples of TWDM PON in OptiSystem samples as far as I am concerned. However, I addressed a page last week where Gulkaran was able to find the TWDM files and make the necessary changes. I also attached some screen shots with the help of which Gulkaran is able to implement downlink and uplink separately.

It should be noted that the most of TWDM files attached in the fourms may not work fine, but they can be useful to researchers to start their work with.

Regards

[Aabid BabaParticipant]

Hi Alistu,
You are right he needs to go step by step and remodel any existing WDM system to get what he is desiring for. Is there any existing TWDM-PON osd file in the examples in the optisystem sample files? I have not noticed one. Please if you find any developed by optiwave itself then upload the osd file here. Thanks

Regards

[alistuParticipant]

Hi Gulkaran,

On a step by step procedure, you can implement the system you have in mind. First of all, you need to implement the overall structure using screen shots I attached in the other forum. Then you need to troubleshoot the system to work fine. Finally, you can change the bit rate in layout parameters and change any other corresponding WDM filter bandwidth if necessary.

Regards

[Aabid BabaParticipant]

Hi gulkaran,
I don’t think you can get a ready made 40 Gbps TWDM-PON. you can develop your own 40 Gbps by modifying your previous TWDM- PON system if you have any.
For your reference please follow the link where a simple TWDM-PON has been designed in optiwave 7.

TWDM PON

hope it may help.
Regards

[Aabid BabaParticipant]

Hi gulkaran,
I don’t think you can get a ready made 40 Gbps TWDM-PON. you can develop your own 40 Gbps by modifying your previous TWDM- PON system if you have any.
For your reference please follow the link where a simple TWDM-PON has been designed in optiwave 7.

hope it may help.
Regards

[alistuParticipant]

Hi Ranjeet,

I believe NGPON1 to have been standardized a few years before NGPON2 was standardized. However, I totally agree that the only PON standard that makes use of WDM is NG-PON2 so far, which makes use of WDm for the downstream and TDMA for upstream. This scheme has been called TWDM as you have mentioned.

Regards

[Ranjeet KumarParticipant]

hi,
as far as i know NGPON1 is not being standarised till now while NGPON2 Is standarised with downlink data rate of 40 gbps and 10 gbps in uplink.
So, if you will use TWDM PON you have to follow standards of NGPON2.

[FAYIQA NAQSHBANDISpectator]

Hi Ranjeet

Correctly mentioned by alistu..that link and power budget are the same.Term power budget is mostly used but u wil find a few papers using the term link budget too but anyway both have the same significance.
Now for calculating the power budeget of a WDM PON system you can use the formula

Power Budget = Transmitted power – Reciever sensitivity

Also calculate the total losses of your system.
Then make sure that the power budget you calculate using the above equation is higher than the total loss of your system.Take the losses due to MUX,Fiber and all other components into consideration to calculate the total system loss.

If your power budget comes out to be low than the total loss you can then make use of amplifiers at the OLT and ONU terminals to improve the reciever sensitivity of your system.

[gulkaran bajwa]

need .osd file of 40 Gbps TWDM PON