Massive submarine monitoring BOTDA system based on mesh multi-stage remote pump amplification

A massive submarine monitoring Brillouin optical time domain analysis (BOTDA) system based on a mesh multi-stage remote pump amplification, comprising:

• a submarine monitoring optical cable, laid in a mesh structure interlaced with M-section transverse optical cables and N-section longitudinal optical cable, and a submarine monitoring BOTDA device;
• wherein a transverse optical cable closest to the submarine monitoring BOTDA device is taken as a first section transverse optical cable, a longitudinal optical cable closest to the submarine monitoring BOTDA device is taken as a first section longitudinal optical cable, grid intersection points of the first section transverse optical cable and each section of the longitudinal optical cables except a (N+1)/2-th section longitudinal optical cable are connected with transverse branching optical cable interfaces, a grid intersection point of the first section transverse optical cable and the (N+1)/2-th section longitudinal optical cable are connected with a transverse single gain optical cable interface, grid intersection points of the first section longitudinal optical cable and each section of the transverse optical cables except a (M+1)/2-th section transverse optical cable are connected with longitudinal branching optical cable interfaces, a grid intersection point of the first section longitudinal optical cable and the (M+1)/2-th section transverse optical cable is connected with a longitudinal single gain optical cable interface, grid intersection points of the (M+1)/2-th section transverse optical cable and each section of the longitudinal optical cables except the first section longitudinal optical cable and the (N+1)/2-th section longitudinal optical cable are connected with longitudinal dual gain optical cable interfaces, grid intersection points of the (N+1)/2-th section longitudinal optical cable and each section of the transverse optical cables except the first section transverse optical cable and the (M+1)/2-th section transverse optical cable are connected with transverse dual gain optical cable interfaces, a grid intersection point of the (M+1)/2-th section transverse optical cable and the (N+1)/2-th section longitudinal optical cable is connected with a bidirectional single gain optical cable interface, M and N are both odd numbers greater than or equal to 3;
• and,
• the submarine monitoring BOTDA device is configured to transmit a group B of pumping light and a retrieval pulse to the first section transverse optical cable, and to transmit a group A of pumping light and a probe light to the first section longitudinal optical cable.