Optical signal transmitting assembly, TOSA and optical module

The utility model relates to an optical signal emission assembly, TOSA and optical module, the optical signal emission assembly comprises an LD chip and a lens, and also comprises a diaphragm used for blocking reflected light, in an optical path, the diaphragm is arranged behind the lens, and an optical signal emitted by the LD chip is emitted out through a hole of the diaphragm after being coupled by the lens. An optical isolator in a traditional structure is replaced by the diaphragm, the diaphragm can resist reflected light and improve the influence of the reflected light on the LD chip on one hand, optical signals emitted by the LD chip can be normally output on the other hand, normal use of the optical signal emitting assembly is guaranteed, the cost of the diaphragm is far lower than that of the optical isolator, and the diaphragm is suitable for being used in the optical signal emitting assembly. Therefore, the cost of the optical signal transmitting assembly can be greatly reduced. 本实用新型涉及一种光信号发射组件、TO