Abstract: An electro-opto-mechanical cable includes at least one thinwall steel alloy tube containing at least one single mode fiber and a void filling gel to assure the capability for transmitting low-noise optical phase data. A dielectric annulus and an electrically conductive layer disposed therein helps further assure watertight integrity and power or electrical signal transfer. An optional double-layer contrahelical or three or four layer, torque balanced, steel wire strength member provides additional protection as well as capability to be towed, deployed and recovered from the seafloor at abysmal depths. The steel armor and cable core interface eliminates all intersticial spaces associated with the armor wires to produce a firm, hard cable that experiences minimal residual strain (creep) due to extensive load cycling. A pressure extruded outer jacket aids in assuring the protection of the individual steel wires from point loadings and from strength degradation due to corrosion.

Abstract: A tapered optical fiber amplifier is designed to provide for long-distance, un-repeatered fiber optic communications. Two single-mode fiber portions are tapered to efficiently intensify and couple an information signal from a laser diode and a pump signal at a shorter wavelength into a fused, tapered single-mode fiber optic coupler. The concentrated information signal and concentrated pump signal are combined via the coupler which is coupled to a several-kilometer length of a relatively small core diametered single-mode fiber to create a nonlinear optical effect (stimulated Raman scattering) (SRS). The SRS causes Raman shift of the pump signal to amplify the information signal, resulting in amplified signals that are efficiently coupled out of the relatively small core diametered optical fiber with another single-mode optical fiber taper portion.

Abstract: An "integrated fiber" device provides optical signal amplification to: (1) provide for increased distances between undersea repeaters and/or optical regeneration nodes in fiber optic transmission systems, or (2) support an increased number of multiple users on an optical data bus network or multiple parallel signal processing channels in an optical processor/computer. In the latter case a greater number of divisions of the signal can occur before the divided signal amplitude falls below the threshold needed for processing or detection. A combination of fiber components is incorporated that include: two optically tapered portions for conditioning of two input laser beams to a wavelength selective single-mode coupler used to combine the concentrated information signal and concentrated pump wave, and one of whose output ports is then optically coupled to a predetermined length of single-mode fiber.