Optical waveguides – Planar optical waveguide
Patent
1998-02-06
2000-08-22
Bovernick, Rodney
Optical waveguides
Planar optical waveguide
385132, G02B 610
Patent
active
061084786
ABSTRACT:
A tapered rib waveguide tapering from a large, multi-mode optical waveguide to a smaller, single-mode optical waveguide, the tapered rib waveguide comprising two portions (4,5) formed of the same material: a lower portion (4) which tapers laterally from the large waveguide to the smaller waveguide and an upper portion (5) formed on the lower portion (4), which tapers to a point (or other form of termination), the dimensions of the two portions (4,5) being such that substantially all of a fundamental mode propagated in the large multi-mode waveguide is coupled to the smaller, single-mode waveguide.
REFERENCES:
patent: 5078516 (1992-01-01), Kapon et al.
patent: 5278926 (1994-01-01), Doussiere
patent: 5444805 (1995-08-01), Mayer
Margail, J. et al., entitled "Reduced Defect in Silicon-on-Insulator Structures Formed by Oxygen Implantation in Two Steps", Appl. Phys. Lett. 54, pp. 526-528, Feb. 6, 1989.
Tang C.K. et al., entitled "Development of a Library of Low-Loss Silicon-On-Insulator Optoelectronic Devices" IEE Proceedings Optoelectronics, vol. 143, No. 5, Oct. 1996, pp. 312-315.
Schmidtchen, J., et al., "Low Loss Singlemode Optical Waveguides with Large Cross-Section in Silicon-On-Insulator", Electronics Letters, vol. 27, No. 16, Aug. 1991, pp. 1486-1488.
Asghari Mehdi
Harpin Arnold Peter Roscoe
Morris Robin Jeremy Richard
Rickman Andrew George
Bookham Technology Limited
Bovernick Rodney
Wise Robert E.
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