Optical waveguides – With optical coupler – Plural
Patent
1991-03-18
1993-01-12
Lee, John D.
Optical waveguides
With optical coupler
Plural
385 43, G02B 626, G02B 642
Patent
active
051796031
ABSTRACT:
Disclosed is a fiber amplifier system in which a gain fiber is operatively combined with a fiber optic coupler having first and second coupler optical fibers. The coupler fibers are fused together along a portion of their lengths to form a wavelength dependent coupling region whereby most of the light power of a wavelength .lambda..sub.s couples between them, and most of the light power of a wavelength .lambda..sub.p that is introduced into the first fiber remains in it. The mode field diameter of the first coupler fiber is substantially matched to that of the gain fiber and is smaller than that of the second coupler fiber. One end of the first coupler fiber is spliced to the gain fiber. A transmission fiber is spliced to the second coupler fiber, and a laser diode introduces pumping light of wavelength .lambda..sub.p to the first coupler fiber. The fiber optic coupler preferably includes an elongated body of matrix glass through which the first and second coupler fibers extend. The matrix glass has a refractive index n.sub.3 that is lower than that of the fiber claddings. The fibers are fused together along with the midregion of the matrix glass, the fiber cores being more closely spaced at the central portion of the midregion than at the body endfaces, thereby forming the coupling region.
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Hall Douglas W.
Miller William J.
Webb Thomas W.
Weidman David L.
Corning Incorporated
Lee John D.
Simmons, Jr. W. J.
Wise Robert E.
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