Brillouin optical time domain analyzer

The invention discloses a laser Brillouin optical time domain analyzer, which includes: a unilateral pump laser Brillouin optical time domain analyzer, a bilateral pump laser Brillouin optical time domain analyzer, and a unilateral pump laser and common raman pump mixed Brillouin optical time domain analyzer. In the Brillouin optical time domain analyzer provided by the invention, an optical fiber random laser is applied to a sensing system of an analyzer and random laser is taken as a distributed raman amplification pump source of the analyzer, so that a low noise raman amplification can be carried out for an entire sensing distance, and thus the sensing distance is extended.