Dear Alexander,
You may use the User Defined Bit Sequence Generator and load your own sequence in the field Filename, or use Pseudo-Random Bit Sequence Generator component and select Alternate in the field of the Operation mode. The later option gives you alternate 0 and 1 with equal numbers in the sequence. If you’d like to discuss further, please send me an email to ahmad.atieh@optiwave.com.
Regards,
Ahmad