BOSA assembly with isolation

The utility model relates to the optical communication field, and discloses a BOSA assembly with isolation; the BOSA assembly comprises a base housing, a light emission unit, a light reception unit, a filter group and a tail fiber; the light emission unit comprises a TO package laser and a free space isolator arranged in an isolator rack; an outer diameter of the isolator rack is consistent with that of a laser TO pipe, and the isolation rack is bonded on the laser TO pipe; the laser bonded with the free space isolator is stamped on an emission port of the base housing through tight cooperation, and the laser and the base housing are reinforced through laser welding; the free space isolator is built in the base housing of the conventional BOSA, so product isolation level can be effectively improved without changing a product size; no improvement is needed for the original module, thus preventing material waste, saving redesigning die cost, improving product performance, and keeping product structure stability.