An optimized up to 16-user and 160 Gbps dual cascaded optical modulators PON-based power combined array fiber Bragg grating and pre-distortion device for 5th G system

Passive optical network (PON) technology has evolved to meet the needs of 5th-generation systems, requiring higher data rates and longer fiber link lengths. This study introduces a novel architecture for a PON serving up to 16 clients with a total bit rate of up to 160 Gbps, using a wavelength division multiplexing (WDM) optical transmitter. Three unique techniques are used in the optical line terminal (OLT), including a dual cascaded direct vertical cavity surface emitting laser (VCSEL) modulator, a non-reactive zero zone (NRZ) and an impulse generator, and a pre-distortion device (PD). The power efficiency approach focuses on enhancing linearity in transmitter amplifiers. An alternative approach, Power Combined Array Fiber Bragg Grating (PCAFBG), is introduced before de-multiplexing. The configuration involves 8 VCSELs modulating 8 (up to 16) data sources, which are then introduced to 8(up to 16) MZM before multiplexing. A post-PCAFBG is used before optical demodulation. Performance measurements were conducted using OptiSystem 20, and the proposed model performance was measured using Q-factor and max OSNR. The simulation results showed that using PCAFBG post-compensator extended the fiber length by 36 km more than without PCAFBG. For each user the impulse generator overruns NRZ coding format for data rates of about 10 Gbps, up to a maximum attainable distance of 86 km.