Transmitter optical subassembly

The utility model discloses a transmitter optical subassembly which comprises a laser, a lens, a pedestal, a fiber and a fiber adapter. The laser is fixedly arranged in the pedestal; along the light emission direction of the laser, the lens is embedded and fixed in the pedestal or the surface of the pedestal; along the light emission direction of the laser, a through hole for accommodating the fiber is formed in the adapter; the light emission central line of the laser, the main optical axis of the lens and the central line of the fiber are superposed; and a preset angle is formed between the end surface of the fiber orientated to the lens and the main optical axis of the lens. The fiber adapter comprises a sleeve, an insert-core pedestal and an insert core. According to the utility model, it is effectively avoided that optical signals emitted by the laser are reflected back to a resonant cavity of the laser, the transmission performance of transmitter optical subassembly is ensured, and the cost is reduced.