Optical modulation amplification chip, light source chip, optical module and related method

The embodiment of the invention discloses an optical modulation amplification chip, a light source chip, an optical module and a related method. The requirements of high-gain amplification, rapid modulation and high output power of input light can be met at the same time. The light modulation amplification chip comprises a first area and a second area, one area is used for amplifying light, and the other area is used for amplifying and modulating the light at the same time. The first region and the second region share the same substrate, and the first region is electrically isolated from the second region. The first area is close to the light input end of the light modulation amplification chip, and the second area is close to the light output end of the light modulation amplification chip. The first waveguide in the first area and the second waveguide in the second area are connected in series in the optical transmission direction of the optical modulation amplification chip. A light limiting factor of the first active layer in the first region is greater than a light limiting factor of the second active layer in the second region.