PRBS generator sequence length

[Sahil Nazir]

Hello Everyone

Can anyone tell me what is the logic behind choosing different sequence lengths of PRBS generator in OptiSystem. Does a particular sequence length choosen has any relation with the data rate or other parameters of the simulation model.
I’m working over 128 Gbps DP-QPSK based FSO transceiver design in Optisystem. I have taken PRBS generator sequence length of 2^17-1. Could I go for higher sequence lengths or not?

[Ahmad Atieh]

Hello Sahil,
The PRBS generator is used to produce bits that could represent actual data transmitted in real life. The longer the bit sequence the better. However, that causes limitation on the computer memory and speed of calculations. Typically, 2^16-1 is suitable for the modulation scheme you are using. In OptiSystem, we allow total bit sequence and samples per bit (equal to number of samples) to 2^31-1. so you can adjust both parameters to be within this limit.
Regards,
Ahmad

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