Cut-off filter for integrated optics

Details Cut-off filter for integrated optics Cut-off filter for integrated optics

1987-03-16

1988-11-29

Lee, John D.

350 9619, 3501622, 35016223, G02B 2742

Patent

active

047876905

ABSTRACT:
A cut-off filter for integrated optics, which filter has a form of a relief-like surface grating on a film or strip waveguide, is formed in a portion of the strip waveguide having a reduced layer thickness and is formed with a constant corrugation depth. Preferably, the formation of the grating is done in a simple way by simultaneously etching a depression in the strip waveguide and also etching the grating structure onto the floor of the depression with the assistance of anisotropically acting etchants.

REFERENCES:
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patent: 4636031 (1987-01-01), Schmadel, Jr. et al.
patent: 4670093 (1987-06-01), Maerz et al.
patent: 4707059 (1987-11-01), Ogura et al.
Cross et al., "Sidelobe Suppression in Corrugated-Waveguide Filters," Optics Letters, vol. 1, No. 1, Jul. 1977, pp. 43-45.
Kim et al., "Tunable Narrow-Band Thin-Film Waveguide Grating Filters," IEEE Journ. of Quantum Electr., vol. QE-15, No. 12, Dec. 1979, pp. 1405-1408.
Mahlein, "Wavelength-Selective Beam Splitters with Minimum Polarizing Effects for Wavelength-Division Multiplexing in Optical Communication Systems" Optica Acta, 1981, vol. 28, No. 1, pp. 28-41.
Yariv, "Propagation, Modulation, and Oscillation in Optical Dielectric Waveguides" Quantum Electronics, Second Edition, John Wiley & Sons, 1975, pp. 508-544.
Hall et al., "Edge Coupling of a GaAlAs DH Laser Diode to a Planar Ti:LINbO.sub.3 Waveguide" Applied Optics, vol. 19, No. 11, Jun. 1, 1980, pp. 1847-1852.

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