Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1985-09-30
1987-05-26
Lindsay, Robert
Glass manufacturing
Processes
Forming product or preform from molten glass
65 42, 65 421, 65 43, 65 13, 350 9633, 350 9615, C03B 37023, C03C 2502
Patent
active
046682643
ABSTRACT:
A method of making an optical fiber, comprising the steps of forming an optical preform having a core and a cladding with different refractive indices, the core being offset from the geometric center of the preform and having a non-circular cross-section defining two transverse orthogonal axes, the core having a longer transverse dimension along one of the orthogonal axes than along the other of the axes for guiding two fundamental modes, which, in combination with the different refractive indices, permits the de-coupling of waves polarized along the axes, the outer surface of the preform having a non-circular cross-section forming an indexing surface with a predetermined geometric relationship to the core and the orthogonal transverse axes so that the location of the core and the orientation of the axes can be ascertained from the geometry of the outer surface, and drawing an optical fiber from the preform with the drawing rate and the temperature of the preform being controlled to produce a fiber with a cross-sectional geometry similar to that of the preform.
REFERENCES:
patent: 3582305 (1971-06-01), Dunlop et al.
patent: 3887265 (1975-06-01), Margolis et al.
patent: 4274854 (1981-06-01), Pleibel et al.
patent: 4308045 (1981-12-01), Miller
patent: 4426129 (1984-01-01), Matsumura et al.
patent: 4444463 (1984-04-01), Schneider et al.
Electronic Letters 25 Sep. 1980, vol. 16, #20, pp. 762-763, Eichoff "In-Line Fibre-Optic Polariser.
Electronic Letters, 10 May 1982, vol. 18, #13, pp. 566-568, Schoner et al, "Novel Method . . . Optical Fiber Directional Couplers".
Andrew Corporation
Lindsay Robert
Rudisill Stephen G.
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