There is a similar forum post at:
https://optiwave.com/forums/topic/optical-cdma-system/
If you are looking for recent research topics, I found this article on simulating an SAC-OCDMA network using OptiSystem. We don’t have an exact design file for this, but you could adapt the “SAC-OCDMA.osd” in your samples folder to recreate their results.
Alhassan, A.M.; Badruddin, N.; Saad, N.M.; Aljunid, S.A., “Beat noise mitigation through spatial multiplexing in spectral amplitude coding OCDMA networks,” Photonics (ICP), 2013 IEEE 4th International Conference on , vol., no., pp.169,171, 28-30 Oct. 2013