Optical branching waveguide

Details Optical branching waveguide Optical branching waveguide

1990-08-03

1992-06-30

Ullah, Akm E.

Optical waveguides

Planar optical waveguide

Thin film optical waveguide

385 14, G02B 630, H04B 900

Patent

active

051270811

ABSTRACT:
An optical branching waveguide having low radiative loss and low back-reflectivity is described. By employing between the branches a region having a gradual decrease in effective refractive index along the direction of optical propagation, the deleterious effect of wedge tip truncation can be reduced. According to the teachings of the invention, this may be accomplished by gradually decreasing the thickness of the optical material along the axis of optical propagation and planarizing the region with an optical material having a lower refractive index than the underlying optical material.

REFERENCES:
patent: 4674827 (1987-06-01), Izutsu et al.
patent: 4760569 (1988-07-01), Mahlein
patent: 4846540 (1989-07-01), Kapon
patent: 4878727 (1878-11-01), Boiarski et al.
Koren et al., "Semi-Insulating Blocked Planar . . . ", Electronic Letters, Feb. 4, 1988, vol. 24, No. 3, pp. 138-139.
Sasaki et al., "Normalised Power Transmission In Single Mode . . . ", Electronics Letters, Feb. 5, 1981, vol. 17, No. 3, pp. 136-138.
Burns et al., "Mode Conversion in Planar-Dielectric Separating Waveguides", IEEE Journal of Quantum Electronics, vol. QE-11, No. 1, Jan. 1975, pp. 32-39.
Liou et al., "Monolithic Integrated InGaAsP/InP . . . ", Appl. Phys. Lett. 54(2), Jan. 9, 1989, pp. 114-116.

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