Optical waveguides – With optical coupler – Particular coupling structure
Patent
1990-08-03
1991-12-24
Gonzalez, Frank
Optical waveguides
With optical coupler
Particular coupling structure
385 96, 359341, G02B 626
Patent
active
050746332
ABSTRACT:
Disclosed is an optical communication system comprising at least two optical fibers of dissimilar core sizes, joined by a fusion splice. In one embodiment, the larger-core fiber is a communication fiber, and the smaller-core fiber is an erbium-doped amplifier fiber. A taper region is included adjacent the splice. The diameter of the smaller-core fiber increases within the taper region as the splice is approached along the smaller-core fiber. The taper region is substantially free of constrictions. As a consequence of the taper region, the optical losses associated with the splice are relatively low, even when there is relatively high mismatch between the mode field diameters (at a signal wavelength) in the respective fibers.
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Electronics Letters, vol. 22, No. 6, Mar. 13, 1986, "Low-Loss Joints Between Dissimilar Fibers by Tapering Fusion Splices," by P. B. Mortimore and J. V. Wright, pp. 318-319.
Journal of Lightwave Technology, LT4, July 1986, "Splice Loss of Single-Mode Fiber as Related to Fusion Time, Temperature, and Index Profile Alteration," by J. T. Krause et al., pp. 837-840.
Journal of Lightwave Technology, LT5, No. 9, Sep. 1987, "Low-Loss Fusion Splicing of PCVD-DFSM Fibers," by Werner Zell, Johann A. Becker, Peter K. Bachmann, and W. G. Hermann, pp. 1192-1195.
International Wire & Cable Symposium Proceedings, 1988, "Fusion Splices With Low Loss Between SM-Fibers of Different Types," by W. Stieb and J. Schulte, pp. 569-575.
Cohen Leonard G.
Krause John T.
Reed William A.
Walker Kenneth L.
AT&T Bell Laboratories
Finston Martin I.
Gonzalez Frank
Heartney Phan T.
Pacher Eugene E.
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