Lasers, modulators, and photodetectors at the core of the microwave photonic link are active devices that introduce additional noise during the electro-optical-electrical conversion of microwave signals, deteriorating the noise performance of the microwave signals and thereby reducing the sensitivity, dynamic range, detection accuracy, and other key performance indicators of the electronic information system. Therefore, noise suppression has become critical to achieving high-performance microwave photonic systems. To overcome the limitations of current lasers with high noise, this study proposes the use of conventional distributed feedback lasers combined with optical amplifiers and narrow-band photonic filtering to suppress laser source noise and realize the broadband low-noise capabilities of the microwave photonic link. This study develops a microwave photonic link transmission model and analyzes the mapping relationship between the link performance and device parameters. The noise performances of the combined light source scheme and the conventional microwave photonic link are measured and compared, and the results show that the use of a high-power light source combined with optical filtering can achieve a high suppression of laser distal relative intensity noise (RIN). Through optimization, the noise figure can be improved by more than 15dB compared with the conventional level.