We propose a frequency modulation (FM) non-coherent detection (NCD) scheme. attempting to suppress the mode partition noise (MPN) in fiber-optic communication systems with the Fabry-Perot (FP) semiconductor laser as the light source. The system comprises a FM transmitter with a directly modulated FP laser and a semiconductor optical amplifier. standard single mode fiber. https://alwaysincolouers.shop/product-category/homeware/