Taper shapes for ultralow sidelobe levels in directional coupler

Optical waveguides – With optical coupler – Particular coupling structure

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G02B 600, G02B 636

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055639704

ABSTRACT:
An optical directional coupler filter having at least two guides; an input guide and a coupled guide. The spacing between the guides and hence the interactive strength is tailored so as to provide ultralow sidelobe levels at a narrow spectral bandwidth. A formula has been derived with respect to the tapered shape function of the waveguides in order to arrive at the optimum results.

REFERENCES:
patent: 4243295 (1981-01-01), Alferness
patent: 5309534 (1994-05-01), Cohen et al.
patent: 5428701 (1995-06-01), St Ville et al.
"Filter Characteristics of Codirectionally Coupled Waveguides with Weighted Coupling", Alferness, R. C., et al, IEEE Journal of Quantum Electronics, vol. QE-14, No. 11, Nov. 1978, pp. 843-847.
"Optical Directional Couplers with Weighted Coupling", Alferness, R. C., Appl. Phys. Lett. 35(3), 1 Aug. 1979, pp. 260-262.
"Sidelobe Suppression in Grating-Assisted Wavelength-Selective Couplers", Sakata, H., Optics Letters, vol. 17, No. 7, Apr. 1, 1992, pp. 463-465.
"Coupled-Mode Theory of Optical Waveguides", Haus, H. A., et al, Journal of Lightwave Technology, vol. LT-5, No. 1, Jan. 1987, pp. 16-23.

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