Patent
1979-11-19
1982-05-04
Lee, John D.
350 9620, 350413, G02B 726
Patent
active
043279635
ABSTRACT:
A coupling element for an optical transmission system, in which the coupling element comprises a convex lens having a refractive index which is dependent on the radius r of a shell in the lens, and a holder. Use is preferably made of lenses having a refractive index N.sub.(r) =N.sub.1 .multidot.(2-(R/Ro).sup.2)1/2, where N.sub.1 is the refractive index of the core of an optical fiber (approximately 1.55) and Ro is the radius of the lens.
The coupling of monomode fibers via lenses of this kind can be effected wth large dimensional tolerances.
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patent: 4030811 (1977-06-01), Khoe et al.
Cohen et al., "Microlenses for Coupling Junction Lasers to Optical Fibers", Applied Optics, vol. 13, No. 1, Jan. 1974, pp. 89-94.
Zemon et al., "Eccentric Coupler for Optical Fibers . . . ", Applied Optics, vol. 14, No. 4, Apr. 1975, pp. 815-816.
Dakss, "Coupling Light Sources to Fibers", Laser Focus, vol. 11, No. 12, Dec. 1975, pp. 31-34.
Suzuki et al., "Concentrated-Type Directional Coupler for Optical Fibers", Applied Optics, vol. 15, No. 9, Sep. 1976, pp. 2032-2033.
Gieles Joannes P. M.
Khoe Giok D.
Kuyt Gerard
Lee John D.
Schechter Marc D.
U.S. Philips Corporation
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