Optical device used wavelength selective photocoupler

Details Optical device used wavelength selective photocoupler Optical device used wavelength selective photocoupler

1993-09-14

1994-07-26

Ullah, Akm E.

Optical waveguides

With optical coupler

Particular coupling function

385131, G02B 600, G02B 636

Patent

active

053332164

ABSTRACT:
An optical device comprises a substrate, a first guiding layer having a guided mode provided on the substrate, a second guiding layer laminated with the first guiding layer on the substrate, the second guiding layer having a guided mode different from that of the first guiding layer, and a diffraction grating provided on an area where the first and second guiding layers have their guided modes overlapping, the diffraction grating serving to couple the light on the specific range of wavelengths that propagate through the first guiding layer, with the second layer, wherein the diffraction grating comprises a high refractive index region and a low refractive index region disposed periodically in the propagation direction of light, the ratio of the high refractive index region to the low refractive index region occupied in one period changing gradually in the propagation direction of light.

REFERENCES:
patent: 5101469 (1992-03-01), Oda
"Grating Assisted InGaAsp/InP Vertical Co-Directional Coupler Filter" by Alferness et al, Technical Digest Series vol. 4, pp. 215-218 (1989).
"Tunable Optical Waveguide Directional Coupler Filter," by R. C. Alferness et al., Applied Physics Letters, vol. 33, No. 2, pp. 161-163 (Jul. 15, 1978).
"Filter Characteristics of Codirectionally Coupled Waveguides with Weighted Coupling," by R. C. Alferness et al., IEEE Journal of Quantum Electronics, vol. QE-14, No. 11, pp. 843-847 (Nov. 1978).
Journal of Lightwave Technology, vol. LT-5, No. 2, Feb., 1987, New York, N.Y., USA, pp. 268-273.
Optical Engineering, vol. 19, No. 4, Aug., 1980, Bellingham, U.S., pp. 581-586.

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