OptiSystem software is a versatile software that can be used for designing, simulating, and optimizing photonic components, optical links, systems, and networks. The software tool can be used for teaching students at graduate or undergraduate levels. However, a free version of OptiSystem called OptiPerformer enables teaching optical communication, and other Photonics courses to students at the undergraduate level. Optiwave created sets of lab experiments to mimic lab environment teaching. The experiments have a description, tasks, questions, and a solution manual. Consequently, students can learn remotely under any sever condition such as COVID pandemic or weather-related situations. Additionally, universities would allow students to practice in a semi-realistic environment whenever there are no available experimental photonics labs.
KEYWORDS: Digital signal processing, Polarization, Modulation, Eye, Signal detection, Single mode fibers, Numerical simulations, Signal processing, Quadrature amplitude modulation, Data transmission
DP-PAM8 modulated signals with probabilistic constellation shaping (PCS) are investigated for ultrahigh-data rates with diverse shaping strengths and DGD values using direct detection for short distances mainly seen in data centers. The investigation is conducted using numerical simulation, where system performance improvement is achieved when PCS is used. The probabilistic shaping mitigated the uncompensated DGD and dispersion effects in the transmission system. We found that the high-powered symbols close the eye causing high symbol error. Applying PCS opens the eye of the highpowered symbols but closes the eye for low-powered ones. Thus, optimization of the strength of shaping is necessary to get the best performance. Experiments were conducted to investigate the effect of probabilistic shaping on PAM8 system amplified using an optical semiconductor amplifier (SOA). A single polarization PAM8 case was only demonstrated due to accessibility limitations of required parts for dual-polarization PAM8.
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