Search Results for 'wdm'

[FAYIQA NAQSHBANDI]

I plan to design a Passive Optical Network to meet the requirements of NGPON2.
Will TWDM be a promising solution or should OFDM be preferred over TWDM ?

[alistuParticipant]

Hi San,

I don’t have much information regarding theoretical aspect of the bidirectional fiber and how different it is from SMF unidirectional fiber, but in practice, both signals pass through bidirectional fiber simultaneously and in OptiSystem, the optical delay is used, so as to make this bidirectional system work.

As for what you have asked about the system design with bidirectional fiber, you can see Optisystem samples in “PON and access systems” folder, for example “CWDM PON” to see how it can be used and then use your own scheme. Then you can ask any possible further questions here.

Regards

[UMAR FAROOQParticipant]

Actually i have to calculate the power budget of my whole system.I have 4 channel wdm system on transmitter side i applied DQPSK modulation format after multiplexing then i have 50 km SMF link then WDM DEMUX after that i use power splitter one signal goes towards DQPSK receiver and the other to RZ OOK Transmitter for remodulation then these 4 remodulated signals are multiplexed and then SMF then DEMUX and then to OOK receiver and BER analyzer.I use DQPSK in downstream and OOK in upstream for the calculation of my power budget and this eye diagram is on DQPSK receiver side.
Please suggest which modulation format is good for long range PON and what are the improvements possible in this sytem.
Regards
Umar Farooq

[UMAR FAROOQ]

Hello members i used DQPSK modulation format in 4 channel wdm system design.Its eye diagram is not fine at DQPSK receiver side how shall i improve it.Image is attached.

[Hamdi AMMAR]

Hi all
I am trying to design a WDM system for 8 channels with 40GB/s for over 500 km .
My goal is to get a quality factor > 7 but I’m having only 5.2 .
So please share your knowledge and give me some help.
You can also find the attachment.
Thank you.

[Shahbaz QureshiParticipant]

Hi Hoat,

I understand. I’ll take a look at your simulation file and get back to you. Meanwhile, take a look at this discussion if it can be of your help and also if you will attach the screenshot I’ll be able to help promptly.

Link: https://optiwave.com/forums/topic/twdm-pon/

[Tung Tran Van]

Hi all.
I want to simulate a DWDM network using ROADM. I’m using Optisystem v7, but I couldn’t find ROADM in a component library, only OADM.
How can I design a ROADM?

[Hoat LeParticipant]

hi shahbaz . ! i’m simulating WDM/TDM PON network .I am failed “upstream”. can you help me ?

[Hoat LeParticipant]

hi shahbaz . ! i’m simulating WDM/TDM PON network .I am failed “upstream”. can you help me ?

[Tung Tran VanParticipant]

I want to simulate a DWDM network using ROADM. I’m using Optisystem v7, but I couldn’t find ROADM in a component library, only found ADM.
How can I design a ROADM?

[Shahbaz QureshiParticipant]

Hi Alistu,

I know about script mode but that is different from what I need help for. TWDM PON has an option of tunability where lasers automatically tune to different wavelengths and similarly filters depending upon the need. Whether they are at transmitter side or receiver side.

I needed help in this regard if we can perform this in Optisystem or we will have to interface another software with Optisystem to perform this task?

[Shahbaz Qureshi]

Hi,

I am looking for some information on the tunability in TWDM PON implementation. Is it possible to use and tune the DFB lasers and FP filters with respect to requirements in Optisystem? or do we have to interface another software with optisystem?

[Hoat Le]

what is functions of optical delay component in bidirectional WDM system ?

[Hoat Le]

what is functions of optical delay componment in bidirectional WDM ?

[Alessandro FestaParticipant]

You are welcome Alitsu. I encountered a similar issue for 100G WDM systems before, so now I make sure to exactly compensate all the dispersion for all wavelength at high bitrates.

Regards,

Alessandro