The Doctoral Thesis represents a comprehensive investigation into designing, developing, and implementing an innovative hybrid broadband amplifier for fiber optical transmission systems. In response to the ever-increasing demand for higher network capacity and data transmission efficiency, this research addresses the challenges associated with optical signal amplification over extended distances in modern optical communication networks. The core objectives of this study involve the creation of a novel hybrid amplifier that leverages the strengths of different amplification technologies while mitigating their limitations. The Thesis delves into the theoretical principles and practical considerations underlying the hybrid broadband amplifier, drawing from various optical amplifier technologies. It seeks to optimize signal quality and transmission efficiency in fiber optic networks, especially in scenarios where optical attenuation and bandwidth expansion are critical factors. Through a rigorous exploration of the design, performance evaluation, and real-world applications of the hybrid broadband amplifier, this work contributes to advancing state-of-the-art optical communication technologies. The findings and insights presented herein have the potential to significantly enhance the capabilities of optical transmission systems and play a pivotal role in meeting the escalating demands of contemporary high-capacity data networks. Overall, this research offers a valuable contribution to the field of fiber optical transmission and holds promise for the continued evolution and improvement of broadband communication systems.