G - Physics – 02 – B
Patent
G - Physics
02
B
88/97
G02B 6/036 (2006.01)
Patent
CA 1252657
- 18 - SINGLE MODE OPTICAL FIBER Abstract A single mode optical fiber comprises a core (e.g., 10), a first cladding (e.g. 11) surrounding the core, and a second cladding (e.g. 12) surrounding the first cladding. It also comprises a third cladding region (or index "ring") (e.g. 13). The core has radius a and refractive index nc, the first, second, and third cladding regions have inner radii, R1i, R2i, and R3i, outer radii R1o, R2c, and R3o, and indices n1, n2, n3, respectively. The fiber has n1 < n3, R1o < R3i, R3o < R2i. In preferred embodiments, a = R1i, R1o = R3i, R3o = R2i. Appropriate choice of ring parameters can result in a lowering of the cut-off wavelength of the fiber, or in fiber that is less sensitive to macrobending than similar prior art fiber lacking an index ring, without substantial change in fiber parameters that depend primarily on the waveform in the core. An optical fiber communications system comprising the inventive fiber is also disclosed. (FIG. 6)
500720
Glodis Paul F.
Lenahan Terrence A.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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