Monolithic integrated optical amplifier and photodetector

Details Monolithic integrated optical amplifier and photodetector Monolithic integrated optical amplifier and photodetector

1990-08-03

1992-07-28

Ullah, Akm E.

Optical waveguides

Integrated optical circuit

385 1, G02B 630

Patent

active

051346710

ABSTRACT:
An optical amplifier and photodetector are monolithically integrated, with the photodetector being optically coupled to the optical amplifier through a low radiative loss and low back reflectivity branching waveguide. Because of the low reflectivity, the branching waveguide, although having a truncated wedge tip, is able to redirect a small portion of optical radiation from the amplifier to the photodetector without deleteriously effecting the performance of the optical amplifier. The branching waveguide is realized by employing between the branches of the waveguide, a junction region having a gradual decrease in effective refractive index such as to decrease the difference between the refractive indices at the optical interface of the truncated wedge tip as seen by optical radiation incident thereto from the optical amplifier.

REFERENCES:
patent: 4674827 (1987-06-01), Izutsu et al.
patent: 4760569 (1988-07-01), Mahlein
patent: 4846540 (1989-07-01), Kapon
patent: 4878727 (1989-11-01), Boiarski et al.
Koren et al., "Semi-Insulating Blocked Planar . . . ", Electronic Letters, Feb. 4th, 1988, vol. 24, No. 3, pp. 138-139.
Sasaki et al., "Normalised Power Transmission In Single Mode . . . ", Electronic Letters, Feb. 5th, 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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