Optical Power Limitations in Spectral-Amplitude-Coding Optical Code-Division Multiple-Access Systems Due to Stimulated Raman Scattering

In this paper, the maximum power per chip to keep the stimulated Raman scattering (SRS)-induced tilt below a specific level in spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) is evaluated for different number of users. A number of computer simulations have been conducted for this purpose. It is shown that as number of users grows, the power per chip must be decreased to control the SRS-induced tilt and to keep it below acceptable levels. It is also shown that SRS-induced tilt can significantly limit the power per chip levels when the number of users is large. This is the first time such a study is reported for OCDMA systems.