Optical wavelength filter with reduced sidelobes and simple desi

Details Optical wavelength filter with reduced sidelobes and simple desi Optical wavelength filter with reduced sidelobes and simple desi

1995-08-22

1997-10-14

Palmer, Phan T. H.

Optical waveguides

Polarization without modulation

385 7, 385 9, 385 14, 385 16, G02B 600

Patent

active

056779712

ABSTRACT:
An optical wavelength filter has a polarizer, an analyzer, and an optical waveguide, formed in a substrate displaying an acousto-optic effect, that guides light from the polarizer to the analyzer. A transducer formed on the substrate excites a surface acoustic wave, thus creating an acoustic beam. The amplitude of the surface acoustic wave is small at the two sides of the acoustic beam and larger in the middle. The optical waveguide enters the acoustic beam at a point on one of the two sides of the beam, then moves into the center of the beam, and exits the beam at another point on one of the two sides.

REFERENCES:
patent: 5446807 (1995-08-01), Baran et al.
patent: 5455877 (1995-10-01), Baran et al.
Yamamoto et al, "Supressions of Sidelobe Levels for Guided-Wave Acoustic-Optic Tunable Filters Using Weighted Coupling," IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 40, No. 6, Nov. 1993, pp. 814-818.
Kar-Roy et al, "Ultralow Sidelobe-Level Integrated Acoustooptic Tunable Filters Using Tapered-Gap Surface Acoustic Wave Directional Couplers," Journal of Lightwave Technology, vol. 12, No. 6, IEEE, Jun. 1994, pp. 977-981.
Kar-Roy et al, "Integrated Acoustooptic Tunable Filters Using Weighted Coupling," IEEE Journal of Quantum Electronics, vol. 30, No. 7, IEEE, Jul. 1994, pp. 1574-1586.
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control; vol. 40 No. 6, Nov. 1993, USA, "Suppression of Sidelobe Levels for Guided-Wave Acousto-Optic Tunable Filters Using Weighted Coupling", Y. Yamamoto et al, pp. 814-818.
Applied Physics Letters, vol. 61, No. 9, Aug. 31, 1992, New York, US, D.A. Smith et al, "Sidelobe Suppression in an Acousto-Optic Filter With a Raised-Cosine Interaction Strength", pp. 1025-1027.
Journal of Lightwave Technology, vol. 12, No. 6, Jun. 1994, New York, NY, US, "Ultralow Sidelobe-Level Integrated Acoustooptic Tunable Filters Using Tapered-Gap Surface Acoustic Wave Directional Couplers", Arjun Kar-Roy et al, pp. 977-982.
ECOC '94, 20th European Conference on Optical Communication, Sep. 25-29, 1994, Firenze, Italy, Proceedings, vol. 2, H. Hermann et al, "Tapered Acoustical Directional Couplers for Polarization Independent, Integrated Optical Acoustically Tunable Wavelength Filters/Switches", pp. 763-766.

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