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An integral, one-piece, multi-layered shingle and method of fabrication from a planar sheet of shingle material, e.g., asphalt. The planar sheet comprises a base portion having first and second, parallel, lateral edges, with plural elongated tabs extending from the first lateral edge. The plural elo

An integral, one-piece, multi-layered shingle and method of fabrication from a planar sheet of shingle material, e.g., asphalt. The planar sheet comprises a base portion having first and second, parallel, lateral edges, with plural elongated tabs extending from the first lateral edge. The plural elongated tabs are uniquely different but each features a side edge midportion perpendicular to the first lateral edge. Extending from the second lateral edge are a like plurality of short tabs, where the short tabs are laterally offset from the elongated tabs. In a roof placement mode, the elongated tabs are first folded onto the base portion at a midpoint thereof, then reversely bent back upon themselves to form a three layer section. To complete the fabrication, the base portion is folded toward the folded elongated tabs such that the short tabs are positioned adjacent at least one elongated tab to form a second section of two layers.

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An integral, one-piece, multi-layered shingle and method of fabrication from a planar sheet of shingle material, e.g., asphalt. The planar sheet comprises a base portion having first and second, parallel, lateral edges, with plural elongated tabs extending from the first lateral edge. The plural elo

An integral, one-piece, multi-layered shingle and method of fabrication from a planar sheet of shingle material, e.g., asphalt. The planar sheet comprises a base portion having first and second, parallel, lateral edges, with plural elongated tabs extending from the first lateral edge. The plural elongated tabs are uniquely different but each features a side edge midportion perpendicular to the first lateral edge. Extending from the second lateral edge are a like plurality of short tabs, where the short tabs are laterally offset from the elongated tabs. In a roof placement mode, the elongated tabs are first folded onto the base portion at a midpoint thereof, then reversely bent back upon themselves to form a three layer section. To complete the fabrication, the base portion is folded toward the folded elongated tabs such that the short tabs are positioned adjacent at least one elongated tab to form a second section of two layers. that is negative and greater than -40 ps/nm.km, a chromatic dispersion to chromatic dispersion gradient ratio that lies in the range 50 nm to 230 nm, the optical fiber being characterized in that it has an effective area that is greater than or equal to 10 μm2,and bend losses that are less than or equal to 0.05 dB; and an ideal cutoff wavelength that is greater than or equal to 1.1 μm; and wherein the difference between the index at any point of the fiber and the index of the cladding is greater than or equal to -8×10-3. 2. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has chromatic dispersion that is greater than or equal to -20 ps/nm.km. 3. The fiber according to claim 2, characterized in that, for a wavelength of 1550 nm, the fiber has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is greater than 80 nm. 4. The fiber according to claim 2, characterized in that, for a wavelength of 1550 nm, the fiber has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is greater than 100 nm. 5. The fiber according to claim 2, characterized in that, for a wavelength of 1550 nm, the fiber has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is greater than 120 nm. 6. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has chromatic dispersion that is less than or equal to -5 ps/nm.km. 7. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is less than 200 nm, and that is preferably less than 180 nm. 8. A fiber according to claim 7, characterized in that, for a wavelength of 1550 nm, it has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is less than 160 nm. 9. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is greater than 80 nm and that is preferably greater than 100 nm. 10. A fiber according to claim 9, characterized in that, for a wavelength of 1550 nm, it has a ratio between the chromatic dispersion and the chromatic dispersion gradient that is greater than 120 nm. 11. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has an effective area that is greater than or equal to 15 μm2,and preferably greater than or equal to 20 μm2. 12. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has attenuation that is less than or equal to 0.3 dB/km. 13. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has a mode diameter that is greater than or equal to 4 μm, and preferably greater than or equal to 5 μm. 14. A fiber according to claim 1, characterized in that, for a wavelength of 1550 nm, it has a sensitivity to micro-bends that is less than or equal to 1, and preferably less than or equal to 0.5. 15. A fiber according to claim 1, characterized in that it has an ideal cutoff wavelength that is greater than or equal to 1.3 μm. 16. A fiber according to claim 1, characterized in that it has an in-cable cutoff wavelength that is less than or equal to 1.3 μm. 17. A fiber according to claim 1, characterized in that, for wavelengths lying in the range 1300 nm to 1620 nm, it has bend losses that are less than 0.05 dB, and preferably less than 5×10-3dB. 18. A fiber according to claim 1, characterized in that the difference between the index at any point of the fiber and the index of the cladding is less than or equal to 28×10-3,and preferably less than or equal to 20×10-3. 19. A fiber according to claim 1, characterized in that is includes a core surrounded by optical cladding, said core presenting an index profi