Search Results for 'wdm'

[Alaa Mahmoud]

Can a professional help me with my WDM system design? Correct my mistakes if any.
My design is attached

[hanan taiser hassan]

Hello, please I need to know how I can use WDM to generate OCDMA codes

[Zella KrogerMember]

Dear Ahmad:
Wow, it works! Thank u so much Mr. Atieh!
But after I used WDM analyzer, there still one question:
I used QPSK to build OFDM system, and the WDM analyzer always tells me signal power equals 0. Is this because of QPSK or because I used only one wavelength?
If there is an offense, please forgive me.
Mackenzie

[Zella KrogerMember]

Dear Ahmad:
Wow, it works! Thank u so much Mr. Atieh!
But after I used WDM analyzer, there still one question:
I used QPSK to build OFDM system, and the WDM analyzer always tells me signal power equals 0. Is this because of QPSK or because I used only one wavelength?
If there is an offense, please forgive me.
Mackenzie

[Ahmad AtiehModerator]

Dear Mackenzie,
You may access the Constellation of the OFDM Demodulator through the Project Browser as shown in the attached image. You can measure the OSNR using the WDM Analyzer Visualizer at Default/Visualizer Library/Optical/
Regards,
Ahmad

[Ahmad AtiehModerator]

Dear Mackenzie,
You may access the Constellation of the OFDM Demodulator through the Project Browser as shown in the attached image. You can measure the OSNR using the WDM Analyzer Visualizer at Default/Visualizer Library/Optical/
Regards,
Ahmad

[Ahmad AtiehModerator]

Dear Stan,
the cause is due to the addition of the tails of the modulated signal of each DWDM channel within a specific channel MUX bandwidth. The more the number of channels, the more tails (noise) are added.
Regards,
Ahmad

[Ahmad AtiehModerator]

Dear Stan,
the cause is due to the addition of the tails of the modulated signal of each DWDM channel within a specific channel MUX bandwidth. The more the number of channels, the more tails (noise) are added.
Regards,
Ahmad

[Stan Liviu]

Hello everyone,

I want to analyze the OSNR for a DWDM link, with 50km of fiber length, 3 EDFAs,and one DCF.
With a WDM analyzer at the output of the MUX, I see that for 8 or less used channels, the noise per channel at the output of the MUX is -100dBm.
For 16 channels, noise is around -50 and for 40 channels used, around -30.
Can someone explain me why Noise value changes at multiple channels used ?
I am using a WDM transmitter, output power 2.6dBm, 100Ghz spacing, 10Gb/s, 30Ghz BW for the WDM MUX ES.
Thank you !

[rajkumar gupta]

Hello every one
I am designing DWDM system and want to calculate the disperse pulse width.When i use OTDR after SMF i am getting this kind of waveform(pic.attached here) and not able to calculate disperse pulse width and when i change the range of time and power, width of the pulse is very much less, even less than transmitted pulse width.what will be the reason.Is there any way to calculate the pulse width?pls help.

• This topic was modified 4 years, 6 months ago by rajkumar gupta.

[ELBAR salim]

Hi all

Please I need a design for WDM-PON with cascade AWG

Br

[Ahmad AtiehModerator]

Hello Rajkumar,
The bandwidth of the MUX/DEMUX is crucial in your DWDM system. Please find attached a paper that discussed this issue that will give you some guidance.
Regards,
Ahmad

[rajkumar gupta]

Hi..everyone
—-I am designing 8/16/32 channels DWDM system.When i used Bandwith of MUX/DMUX from 10GHZ to 100GHZ .the system performance has increased.Why this ishappening? and If i used 100GHz it will be correct or there is any formula to decide the value of bandwidth for MUX/DMUX.
Please help..
—-another problem is ..In 32 channel DWDM system with all compensation techniques or OPC technique, when i used EDFA in between SMF and DCF …it doesn’t give good result but when i remove EDFA ..the performance has increased.What is reason behind this..please clear..because we use EDFA to improve the signal strength but here its opposite..

[刘 洋Participant]

Hello, I would like to ask, how to use optisystem software to simulate the clock recovery of WDM-PON system?

[Mahmoud HanounehParticipant]

Dear Ahmad,
I would like to thank you for your response first.
what happens exactly is that I am using BPON Bidirectional from the Examples Folder of the latest optisystem version 18.
I have made some changes on it in order to enhance the Q.Factor measured at ONU (downstream) and (upstream).
the changes are:
1- increasing the power in (WDM-Transmitter) at OLT to 0 dBm instead of -3 dBm.
2- increasing the power in (WDM-Transmitter) at ONUs to 0 dBm instead of -3 dBm as well as setting Extinction Ration to 15 dB in all ONUs.
3 – I have added an EDFA Amplifier downstream.
4 – Also, I have added an EDFA Amplifier in upstream.

THE PROBLEM IS the Q.Factor in upstream is 0! And sometimes the simulation process is sticking on Calculating EDFA step. But, Q.Factor at ONUs in downstream increases massively and seems to work properly (reaches to 800).
However, i am going to send you the .osd file that i am working on to <a href=”mailto:ahmad.atieh@optiwave.com”> ahmad.atieh@optiwave.com</a>

Regards,