You’re welcome. The implementation of HOA from papers seems to be as easy as using two optical amplifiers after each other. The important part is its design and effect on the system, and as long as you have a very basic understanding of the software and where to find the optical ampliifers, you can easily implement them. You may find Raman amplifiers harder to set, though. So have a look at optisystem samples regarding Raman amplifiers.
Below I am attaching one Optisystem sample for RA, to which I have added EDFA which increases power by 4 dB. This is NOT from any paper and just shows how the gains are added…just to directly address you question.
Regards