Acoustic-optical device for optical filtering

Details Acoustic-optical device for optical filtering Acoustic-optical device for optical filtering

1995-12-19

1997-07-29

Lee, John D.

Optical waveguides

Directional optical modulation within an optical waveguide

Acousto-optic

385 11, G02B 6126, G02F 100

Patent

active

056528086

ABSTRACT:
An acoustic-optical device for optical filtering includes two successive acoustic-optical interaction segments separated by an intermediate polarizer and each modifying the polarization of light guided by it. The modification depends on the frequencies of the interacting optical and acoustic waves. The acoustic waves are supplied symmetrically to the two interaction segments from a common electro-optical transducer. The transmission spectrum of the optical filter is subject to apodization by coupling between an auxiliary acoustic waveguide including the transducer and a main acoustic waveguide including the optical waveguide. Applications of the device include fiber optic telecommunication systems.

REFERENCES:
patent: 4273411 (1981-06-01), Alferness
patent: 4390236 (1983-06-01), Alferness
patent: 4815802 (1989-03-01), Nakamura
patent: 5002349 (1991-03-01), Cheung et al.
patent: 5400171 (1995-03-01), Song
Herrmann, H. et al, "Integrated Optical, TE-and TM-pass, Acoustically Tunable, Double-Stage Wavelength Filters in LiNbO/sub 3/", Electronics Letters, 26 Mar. 1992, vol. 28, No. 7, ISSN 0013-5194, pp. 642-644, XP 000291369.
Aronson, L. B. et al, "Reduced sidelobe integrated acousto-optic filter with birefringence apodization", Optics Letters, 15 Oct. 1993, USA, vol. 18, No. 20, ISSN 0146-9592, pp. 1721-1723, XP 000398571.
Smith, D. A., et al, "Sidelobe suppression in an acousto-optic filter with a raised-cosine interaction strength", Applied Physics Letters, 31 Aug. 1992, USA, vol. 61, No. 9, ISSN 0003-6951, pp. 1025-1027 XP 000294446.

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