CUT OFF FREQUENCY

[umer ashraf wani]

Each channel is transmitting 5 GB/s data rate in downstream separated by 0.8nm (100GHz) channel
spacing with 1.8GHz filter bandwidth. here what is meant by ”1.8GHz ”

[Duy Le Nguyen]

Hi umer!
Did you mean the bandwidth of the bandpass filter in WDM Mux and Demux blocks?

[umer ashraf wani]

the abstract of the paper goes like this
We successfully demonstrate 40 GB/s 8 channels’ DenseWavelength DivisionMultiplexing (DWDM) over free space optical (FSO)
communication system. Each channel is transmitting 5 GB/s data rate in downstream separated by 0.8nm (100GHz) channel
spacing with 1.8GHz filter bandwidth. DWDM over FSO communication system is very effective in providing high data rate
transmission with very low bit error rate (BER). The maximum reach of designed system is 4000m without any compensation
scheme. The simulation work reports minimum BER for Return-to-Zero (RZ) modulation format at different channels 1, 4, and
8 are found to be 2.32

[Aabid Baba]

Hello Umer,
As far as your query is concerned i will go with what Duy Le has mentioned. There has been lot of confusion over this but i strongly believe that it is the bandwidth of the bandpass filters in WDM MUX and DEMUX. Still if you feel that it is different from what i have understood then please fell free to share the information. It will be very useful. Thanking you.
Regards

[umer ashraf wani]

thank u abid

[Aabid Baba]

Hello,

You are welcome Umer.
All the best

Regards

[burhan num mina llah]

Hello Umer,

As far as the cut off frequency is concerned it is related to the bandwidth which indeed is associated with the filters of the multiplexer or demultiplexer as mentioned by other forum members.
I hope this may help.

Regards

Burhan

[Author]

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