Abstract: The invention is a staggered splice and method for making the same. The staggered splice is used to join two multi-fiber optic cables. Each opposing pair of optic fibers is cleaved such that they all have substantially the same combined length and provide fully operable communication. The light transmitting interfaces are staggered with respect to each other. The individual splices can be mechanical or fusion splices. The splices are typically bundled and protected with a sheath. The staggered splice is particularly applicable for connecting torpedo payout spools wound with the multi-fiber optic micro cable to the shipboard side wire.

Abstract: An acoustic beam having at least one preset frequency is generated and dited towards a preselected non-linear acoustic reradiator. The reradiator returns acoustic waves having a different frequency. These reradiated waves are monitored, and a preselected parameter is detected in response to the returned reradiated acoustic waves. In a first embodiment, the preset frequency acoustic beam is generated at one or more frequencies and radiated by at least one projector. Upon incidence of the preset frequency acoustic beam, a preselected reradiator generates acoustic waves having a different frequency. The reradiated acoustic waves are used to calibrate a hydrophone. The reradiated acoustic waves can be controlled by the acoustic projector without a wire link.In another embodiment, the non-linear reradiation is caused by the action of a projected beam on cavitation generated by a vessel remote from the projector.