An array through a first to a second side of a three-sided junction, accessed remotely by a single mode fiber transmits a light pulse sequence to the array and receives sound modulated return light signals via the second to a third side of the junction. Within each hydrophone, butt coupled fiber joints...http://www.google.fr/patents/US6515939?utm_source=gb-gplus-shareBrevet US6515939 - Pulse sampled optical fiber hydrophone array (U)