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All-Fiber SFPM (Stimulated Four Photon Mixing) Amplifier.
Patent, Filed 31 Aug 88, patented 19 Sep 89,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
An integrated fiber device provides optical signal amplification to 1 provide for increased distances between undersea repeaters andor 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 processorcomputer. 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 2 optically tapered portions for conditioning of 2 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. The fibers optogeometric parameters are especially designed for intrinsic phase-matching to effect pump wave frequency conversion and signal amplification by the nonlinear optical SFPM process. The amplified signal light is coupled out of the especially designed SFPM fiber by a mode-field conditioning device enabling beam expansion, such that the output core diameter of the mode-field conditioner equals the core diameter of the single-mode fiber used in the transmission link. An important aspect of this patent is that it can be configured for field andor undersea installation. edc
APPROVED FOR PUBLIC RELEASE