1988-08-31
1989-09-19
Sikes, William L.
G02B 626, G02B 642
Patent
active
048675180
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. The fibers optogeometric parameters are especially designed for intrinsic phase-matching to effect pump wave frequency conversion and signal amplification by the nonlinear optical process of stimulated four-photon mixing. 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 invention is that it can be configured for field and/or undersea installation.
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Russell Stephen D.
Stamnitz Timothy C.
Fendelman Harvey
Keough Thomas Glenn
Sikes William L.
The United States of America as represented by the Secretary of
Wise Robert E.
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