[gulkaran bajwaParticipant]

Hello Abbas, Actually i want to remodulate the signal by RSOA which we called OOK (On off keying) and i am also getting my results for both 10Gbps CPFSK downstream and 1Gbps/NRZ OOk signal for uplink but when i use to vary fiber length downstream signal start decreasing with increasing fiber length which is obvious but there is no change in OOK Uplink signal even from 10Km to 100Km Q-Factor of OOK signal remain same I am confused with this because it has to decrease but there is no change.

[gulkaran bajwaParticipant]

Hello rajguru,

In TWDM scheme based PON TDM is used for uplink in which different user of ONU can send their data with same wavelength.
i think you are messing with Dynamic Y select there are some important parameter you should concern first
The formula for the Dynamic Y Select 1 for x time slots is given by default
Switching Time event is depend upon X= how many users you are using on same wavelength
For example in BPON example given by Optisystem where X=8 because they are using 8 ONUs which uses same wavelength
So in a default formulate change the value of X might be that will be helpful to you because i was facing same problem before.

[gulkaran bajwaParticipant]

here i am sharing 8 channel unequal space channel allocation model.
if find any relevant regarding this, please guide me.

Attachments:

1. unequal-8-ch.osd

[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

[gulkaran bajwaParticipant]

I just dont understand how to reach 40gbps if i am using each OLT with 10gbps my signal distort but ok with 2.5 gbps each

[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

[gulkaran bajwaParticipant]

hey bro, i am using optisystem 13, i can’t open this osd file shows error
can you resend along with screenshot thanks

[gulkaran bajwaParticipant]

thanks Aabid big thanks
if you will get solution of RSOA uplink we have discussed then please let me know whenever you can ,thanks again

[gulkaran bajwaParticipant]

thanks alistu i really mean it

[gulkaran bajwaParticipant]

and its subsystem screenshots too i shall be very thankful to you

[gulkaran bajwaParticipant]

i have optisystem 7 please send me screenshots of these samples(operate above 9+ version) i am attaching in a comment……..

Attachments:

1. XGPON.osd
2. GPON.osd
3. WDM-PON.osd

[gulkaran bajwaParticipant]

hello alistu,

thanks for your efforts
whats your point regarding uplink

[gulkaran bajwaParticipant]

hello aabid,

i am confused how to use TDMA for uplink (NGPON)simulation because data should be transmitted in time slots
mean to say how should i practically implement…i tried but lost

[gulkaran bajwaParticipant]

hi Aabid,

there is no attachment of osd file in your comment
can you resend it please?
thanks

[gulkaran bajwaParticipant]

Hello Alistu,

Yes its NG-PON2 the link you provided when i use to run in my optisystem shows error and crash. please can you give me just basic idea about NG-PON2